What is the best practice for periodic snapshotting with awc-cloud+s3

vangap · November 7, 2014, 9:52am

I want to backup the data every 15-30 min. I will be storing the snapshots
in S3.

DELETE old and then PUT new snapshot many not be the best practice as you
may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to delete old
snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

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vineeth_mohan_2 · November 7, 2014, 2:45pm

Hi ,

There is a s3 repository plugin -

Use this.
The snapshots are incremental , so it should fit your purpose perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <
pradeepreddy.manu.iitkgp@gmail.com> wrote:

I want to backup the data every 15-30 min. I will be storing the snapshots
in S3.

DELETE old and then PUT new snapshot many not be the best practice as you
may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to delete
old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

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vangap · November 10, 2014, 8:27am

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic snapshot
be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <pradeepreddy...@gmail.com
<javascript:>> wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice as you
may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to delete
old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

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Sally_Ahn · November 13, 2014, 7:02am

I am also interested in this topic.
We were snapshotting our cluster of two nodes every 2 hours (invoked via a
cron job) to an S3 repository (we were running ES 1.2.2 with
cloud-aws-plugin version 2.2.0, then we upgraded to ES 1.4.0 with
cloud-aws-plugin 2.4.0 but are still seeing issues described below).
I've been seeing an increase in the time it takes to complete a snapshot
with each subsequent snapshot.
I see a thread
https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/snapshot/elasticsearch/bCKenCVFf2o/TFK-Es0wxSwJ where
someone else was seeing the same thing, but that thread seems to have died.
In my case, snapshots have gone from taking ~5 minutes to taking about an
hour, even between snapshots where data does not seem to have changed.

For example, you can see below a list of the snapshots stored in my S3
repo. Each snapshot is named with a timestamp of when my cron job invoked
the snapshot process. The S3 timestamp on the left shows the completion
time of that snapshot, and it's clear that it's steadily increasing:

2014-09-30 10:05 686 s3:///snapshot-2014.09.30-10:00:01
2014-09-30 12:05 686 s3:///snapshot-2014.09.30-12:00:01
2014-09-30 14:05 736 s3:///snapshot-2014.09.30-14:00:01
2014-09-30 16:05 736 s3:///snapshot-2014.09.30-16:00:01
...
2014-11-08 00:52 1488 s3:///snapshot-2014.11.08-00:00:01
2014-11-08 02:54 1488 s3:///snapshot-2014.11.08-02:00:01
...
2014-11-08 14:54 1488 s3:///snapshot-2014.11.08-14:00:01
2014-11-08 16:53 1488 s3:///snapshot-2014.11.08-16:00:01
...
2014-11-11 07:00 1638 s3:///snapshot-2014.11.11-06:00:01
2014-11-11 08:58 1638 s3:///snapshot-2014.11.11-08:00:01
2014-11-11 10:58 1638 s3:///snapshot-2014.11.11-10:00:01
2014-11-11 12:59 1638 s3:///snapshot-2014.11.11-12:00:01
2014-11-11 15:00 1638 s3:///snapshot-2014.11.11-14:00:01
2014-11-11 17:00 1638 s3:///snapshot-2014.11.11-16:00:01

I suspected that this gradual increase was related to the accumulation of
old snapshots after I tested the following:

I created a brand new cluster with the same hardware specs in the same
datacenter and restored a snapshot of the problematic cluster taken few
days back (i.e. not the latest snapshot).
I then backed up that restored data to a new empty bucket in the same S3
region, and that was very fast...a minute or less.
I then restored a later snapshot of the problematic cluster to the test
cluster and tried backing it up again to the new bucket, and that also took
about a minute or less.

However, when I tried deleting the repository full of old snapshots from
the problematic cluster and registering a brand new empty bucket, I found
that my first snapshot to the new repository was also hanging indefinitely.
I finally had to kill my snapshot curl command. There were no errors in the
logs (the snapshot logger is very terse...wondering if anyone knows how to
increase the verbosity for it).

So my theory seems to have been debunked, and I am again at a loss. I am
wondering whether the hanging snapshot is related to the slow snapshots I
was seeing before I deleted that old repository. I have seen several issues
in GitHub regarding hanging snapshots (#5958
https://github.com/elasticsearch/elasticsearch/issues/5958, #7980
https://github.com/elasticsearch/elasticsearch/issues/7980) and have
tried using the elasticsearch-snapshot-cleanup
https://github.com/imotov/elasticsearch-snapshot-cleanup utility on my
cluster both before and after I upgraded from version 1.2.2 to 1.4.0 (I
thought upgrading to 1.4.0 which included snapshot improvements may fix my
issues, but it did not), and the script is not finding any running
snapshots:

[2014-11-13 05:37:45,451][INFO ][org.elasticsearch.node ] [Golden Archer]
started
[2014-11-13 05:37:45,451][INFO
][org.elasticsearch.org.motovs.elasticsearch.snapshots.AbortedSnapshotCleaner]
No snapshots found
[2014-11-13 05:37:45,452][INFO ][org.elasticsearch.node ] [Golden Archer]
stopping ...

Curling to _snapshot/REPO/_status also returns no ongoing snapshots:

curl -XGET
'http://:9200/_snapshot/s3_backup_repo/_status?pretty=true'
{
"snapshots" :
}

I may try bouncing ES on each node to see if that kills whatever process is
causing my requests to the snapshot module to hang (requests to other
modules like _cluster/health returns fine; cluster health is green, and
load is low for both nodes - 0.00, 0.06).

I would really appreciate some help/guidance on how to debug/fix this issue
and general recommendations on how to best achieve periodic snapshots. For
example, cleaning up old snapshots seems rather difficult since we have to
specify the snapshot name, which we would obtain by making a request to the
snapshot module, which seems to hang often.

Thanks,
Sally

On Monday, November 10, 2014 12:27:10 AM UTC-8, Pradeep Reddy wrote:

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic snapshot
be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy pradeepreddy...@gmail.com
wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice as
you may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to delete
old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

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Igor_Motov · November 14, 2014, 5:35am

Having too many snapshots is problematic. Each snapshot is done in
incremental manner, so in order to figure out what changes and what is
available all snapshots in the repository needs to be scanned, which takes
time as number of snapshots growing. I would recommend pruning old
snapshots as time goes by or starting snapshots into a new bucket/directory
if you really need to maintain 2 hour resolution for 2 months old
snapshots. The get command can sometimes hang because it's throttled by the
on-going snapshot.

On Wednesday, November 12, 2014 9:02:33 PM UTC-10, Sally Ahn wrote:

I am also interested in this topic.
We were snapshotting our cluster of two nodes every 2 hours (invoked via a
cron job) to an S3 repository (we were running ES 1.2.2 with
cloud-aws-plugin version 2.2.0, then we upgraded to ES 1.4.0 with
cloud-aws-plugin 2.4.0 but are still seeing issues described below).
I've been seeing an increase in the time it takes to complete a snapshot
with each subsequent snapshot.
I see a thread
https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/snapshot/elasticsearch/bCKenCVFf2o/TFK-Es0wxSwJ where
someone else was seeing the same thing, but that thread seems to have died.
In my case, snapshots have gone from taking ~5 minutes to taking about an
hour, even between snapshots where data does not seem to have changed.

For example, you can see below a list of the snapshots stored in my S3
repo. Each snapshot is named with a timestamp of when my cron job invoked
the snapshot process. The S3 timestamp on the left shows the completion
time of that snapshot, and it's clear that it's steadily increasing:

2014-09-30 10:05 686 s3:///snapshot-2014.09.30-10:00:01
2014-09-30 12:05 686 s3:///snapshot-2014.09.30-12:00:01
2014-09-30 14:05 736 s3:///snapshot-2014.09.30-14:00:01
2014-09-30 16:05 736 s3:///snapshot-2014.09.30-16:00:01
...
2014-11-08 00:52 1488 s3:///snapshot-2014.11.08-00:00:01
2014-11-08 02:54 1488 s3:///snapshot-2014.11.08-02:00:01
...
2014-11-08 14:54 1488 s3:///snapshot-2014.11.08-14:00:01
2014-11-08 16:53 1488 s3:///snapshot-2014.11.08-16:00:01
...
2014-11-11 07:00 1638 s3:///snapshot-2014.11.11-06:00:01
2014-11-11 08:58 1638 s3:///snapshot-2014.11.11-08:00:01
2014-11-11 10:58 1638 s3:///snapshot-2014.11.11-10:00:01
2014-11-11 12:59 1638 s3:///snapshot-2014.11.11-12:00:01
2014-11-11 15:00 1638 s3:///snapshot-2014.11.11-14:00:01
2014-11-11 17:00 1638 s3:///snapshot-2014.11.11-16:00:01

I suspected that this gradual increase was related to the accumulation of
old snapshots after I tested the following:

I created a brand new cluster with the same hardware specs in the same
datacenter and restored a snapshot of the problematic cluster taken few
days back (i.e. not the latest snapshot).

I then backed up that restored data to a new empty bucket in the same
S3 region, and that was very fast...a minute or less.

I then restored a later snapshot of the problematic cluster to the test
cluster and tried backing it up again to the new bucket, and that also took
about a minute or less.

However, when I tried deleting the repository full of old snapshots from
the problematic cluster and registering a brand new empty bucket, I found
that my first snapshot to the new repository was also hanging indefinitely.
I finally had to kill my snapshot curl command. There were no errors in the
logs (the snapshot logger is very terse...wondering if anyone knows how to
increase the verbosity for it).

So my theory seems to have been debunked, and I am again at a loss. I am
wondering whether the hanging snapshot is related to the slow snapshots I
was seeing before I deleted that old repository. I have seen several issues
in GitHub regarding hanging snapshots (#5958
https://github.com/elasticsearch/elasticsearch/issues/5958, #7980
https://github.com/elasticsearch/elasticsearch/issues/7980) and have
tried using the elasticsearch-snapshot-cleanup
https://github.com/imotov/elasticsearch-snapshot-cleanup utility on my
cluster both before and after I upgraded from version 1.2.2 to 1.4.0 (I
thought upgrading to 1.4.0 which included snapshot improvements may fix my
issues, but it did not), and the script is not finding any running
snapshots:

[2014-11-13 05:37:45,451][INFO ][org.elasticsearch.node ] [Golden
Archer] started
[2014-11-13 05:37:45,451][INFO
][org.elasticsearch.org.motovs.elasticsearch.snapshots.AbortedSnapshotCleaner]
No snapshots found
[2014-11-13 05:37:45,452][INFO ][org.elasticsearch.node ] [Golden
Archer] stopping ...

Curling to _snapshot/REPO/_status also returns no ongoing snapshots:

curl -XGET
'http://:9200/_snapshot/s3_backup_repo/_status?pretty=true'
{
"snapshots" :
}

I may try bouncing ES on each node to see if that kills whatever process
is causing my requests to the snapshot module to hang (requests to other
modules like _cluster/health returns fine; cluster health is green, and
load is low for both nodes - 0.00, 0.06).

I would really appreciate some help/guidance on how to debug/fix this
issue and general recommendations on how to best achieve periodic
snapshots. For example, cleaning up old snapshots seems rather difficult
since we have to specify the snapshot name, which we would obtain by making
a request to the snapshot module, which seems to hang often.

Thanks,
Sally

On Monday, November 10, 2014 12:27:10 AM UTC-8, Pradeep Reddy wrote:

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic snapshot
be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <pradeepreddy...@gmail.com

wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice as
you may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to delete
old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

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Sally_Ahn · November 14, 2014, 8:19am

Yes, I am now seeing the snapshots complete in about 2 minutes after
switching to a new, empty bucket.
I'm not sure why the initial request to snapshot to the empty repo was
hanging because the snapshot did in fact complete in about 2 minutes,
according to the S3 timestamp.
Time to automate deletion of old snapshots.
Thanks for the response!

On Thursday, November 13, 2014 9:35:20 PM UTC-8, Igor Motov wrote:

Having too many snapshots is problematic. Each snapshot is done in
incremental manner, so in order to figure out what changes and what is
available all snapshots in the repository needs to be scanned, which takes
time as number of snapshots growing. I would recommend pruning old
snapshots as time goes by or starting snapshots into a new bucket/directory
if you really need to maintain 2 hour resolution for 2 months old
snapshots. The get command can sometimes hang because it's throttled by the
on-going snapshot.

On Wednesday, November 12, 2014 9:02:33 PM UTC-10, Sally Ahn wrote:

I am also interested in this topic.
We were snapshotting our cluster of two nodes every 2 hours (invoked via
a cron job) to an S3 repository (we were running ES 1.2.2 with
cloud-aws-plugin version 2.2.0, then we upgraded to ES 1.4.0 with
cloud-aws-plugin 2.4.0 but are still seeing issues described below).
I've been seeing an increase in the time it takes to complete a snapshot
with each subsequent snapshot.
I see a thread
https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/snapshot/elasticsearch/bCKenCVFf2o/TFK-Es0wxSwJ where
someone else was seeing the same thing, but that thread seems to have died.
In my case, snapshots have gone from taking ~5 minutes to taking about an
hour, even between snapshots where data does not seem to have changed.

For example, you can see below a list of the snapshots stored in my S3
repo. Each snapshot is named with a timestamp of when my cron job invoked
the snapshot process. The S3 timestamp on the left shows the completion
time of that snapshot, and it's clear that it's steadily increasing:

2014-09-30 10:05 686
s3:///snapshot-2014.09.30-10:00:01
2014-09-30 12:05 686
s3:///snapshot-2014.09.30-12:00:01
2014-09-30 14:05 736
s3:///snapshot-2014.09.30-14:00:01
2014-09-30 16:05 736
s3:///snapshot-2014.09.30-16:00:01
...
2014-11-08 00:52 1488
s3:///snapshot-2014.11.08-00:00:01
2014-11-08 02:54 1488
s3:///snapshot-2014.11.08-02:00:01
...
2014-11-08 14:54 1488
s3:///snapshot-2014.11.08-14:00:01
2014-11-08 16:53 1488
s3:///snapshot-2014.11.08-16:00:01
...
2014-11-11 07:00 1638
s3:///snapshot-2014.11.11-06:00:01
2014-11-11 08:58 1638
s3:///snapshot-2014.11.11-08:00:01
2014-11-11 10:58 1638
s3:///snapshot-2014.11.11-10:00:01
2014-11-11 12:59 1638
s3:///snapshot-2014.11.11-12:00:01
2014-11-11 15:00 1638
s3:///snapshot-2014.11.11-14:00:01
2014-11-11 17:00 1638
s3:///snapshot-2014.11.11-16:00:01

I suspected that this gradual increase was related to the accumulation of
old snapshots after I tested the following:

I created a brand new cluster with the same hardware specs in the same
datacenter and restored a snapshot of the problematic cluster taken few
days back (i.e. not the latest snapshot).

I then backed up that restored data to a new empty bucket in the same
S3 region, and that was very fast...a minute or less.

I then restored a later snapshot of the problematic cluster to the
test cluster and tried backing it up again to the new bucket, and that also
took about a minute or less.

However, when I tried deleting the repository full of old snapshots from
the problematic cluster and registering a brand new empty bucket, I found
that my first snapshot to the new repository was also hanging indefinitely.
I finally had to kill my snapshot curl command. There were no errors in the
logs (the snapshot logger is very terse...wondering if anyone knows how to
increase the verbosity for it).

So my theory seems to have been debunked, and I am again at a loss. I am
wondering whether the hanging snapshot is related to the slow snapshots I
was seeing before I deleted that old repository. I have seen several issues
in GitHub regarding hanging snapshots (#5958
https://github.com/elasticsearch/elasticsearch/issues/5958, #7980
https://github.com/elasticsearch/elasticsearch/issues/7980) and have
tried using the elasticsearch-snapshot-cleanup
https://github.com/imotov/elasticsearch-snapshot-cleanup utility on my
cluster both before and after I upgraded from version 1.2.2 to 1.4.0 (I
thought upgrading to 1.4.0 which included snapshot improvements may fix my
issues, but it did not), and the script is not finding any running
snapshots:

[2014-11-13 05:37:45,451][INFO ][org.elasticsearch.node ] [Golden
Archer] started
[2014-11-13 05:37:45,451][INFO
][org.elasticsearch.org.motovs.elasticsearch.snapshots.AbortedSnapshotCleaner]
No snapshots found
[2014-11-13 05:37:45,452][INFO ][org.elasticsearch.node ] [Golden
Archer] stopping ...

Curling to _snapshot/REPO/_status also returns no ongoing snapshots:

curl -XGET
'http://:9200/_snapshot/s3_backup_repo/_status?pretty=true'
{
"snapshots" :
}

I may try bouncing ES on each node to see if that kills whatever process
is causing my requests to the snapshot module to hang (requests to other
modules like _cluster/health returns fine; cluster health is green, and
load is low for both nodes - 0.00, 0.06).

I would really appreciate some help/guidance on how to debug/fix this
issue and general recommendations on how to best achieve periodic
snapshots. For example, cleaning up old snapshots seems rather difficult
since we have to specify the snapshot name, which we would obtain by making
a request to the snapshot module, which seems to hang often.

Thanks,
Sally

On Monday, November 10, 2014 12:27:10 AM UTC-8, Pradeep Reddy wrote:

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic snapshot
be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <
pradeepreddy...@gmail.com> wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice as
you may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to
delete old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

--
You received this message because you are subscribed to the Google
Groups "elasticsearch" group.
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Joao_Costa · November 20, 2014, 12:22pm

Hello,

Sorry for hijacking this thread, but I'm currently also pondering the best
way to perform periodic snapshots in AWS.

My main concern is that we are using blue-green deployment with ephemeral
storage on EC2, so if for some reason there is a problem with the cluster,
we might lose a lot of data, therefore I would rather do frequent snapshots
(for this reason, we are still using the deprecated S3 gateway).

The thing is, you claim that "Having too many snapshots is problematic" and
that one should "prune old snapshots". Since snapshots are incremental,
this will imply data loss, correct?
Also, is the problem related to the number of snapshots or the size of the
data? Is there any way to merge old snapshots into one? Would this solve
the problem?

Finally, if I create a cronjob to make automatic snapshots, can I run into
problems if two instances attempt to create a snapshot with the same name
at the same time?
Also, what's the best way to do a snapshot on shutdown? Should I put a
script on init.d/rc.0 to run on shutdown before elasticsearch shuts down?
I've seen cases where the EC2 instances have "not so grateful" shutdowns,
so it would be wonder if there is a better way to do this on a cluster
level (ie, if a node A notices that a node B is not responding, then it
automatically makes a snapshot).

Sorry if some of these questions don't make much sense, I'm still quite new
to elasticsearch and have not completly understood the new snapshot feature.

Em sexta-feira, 14 de novembro de 2014 08h19min42s UTC, Sally Ahn escreveu:

Yes, I am now seeing the snapshots complete in about 2 minutes after
switching to a new, empty bucket.
I'm not sure why the initial request to snapshot to the empty repo was
hanging because the snapshot did in fact complete in about 2 minutes,
according to the S3 timestamp.
Time to automate deletion of old snapshots.
Thanks for the response!

On Thursday, November 13, 2014 9:35:20 PM UTC-8, Igor Motov wrote:

Having too many snapshots is problematic. Each snapshot is done in
incremental manner, so in order to figure out what changes and what is
available all snapshots in the repository needs to be scanned, which takes
time as number of snapshots growing. I would recommend pruning old
snapshots as time goes by or starting snapshots into a new bucket/directory
if you really need to maintain 2 hour resolution for 2 months old
snapshots. The get command can sometimes hang because it's throttled by the
on-going snapshot.

On Wednesday, November 12, 2014 9:02:33 PM UTC-10, Sally Ahn wrote:

I am also interested in this topic.
We were snapshotting our cluster of two nodes every 2 hours (invoked via
a cron job) to an S3 repository (we were running ES 1.2.2 with
cloud-aws-plugin version 2.2.0, then we upgraded to ES 1.4.0 with
cloud-aws-plugin 2.4.0 but are still seeing issues described below).
I've been seeing an increase in the time it takes to complete a snapshot
with each subsequent snapshot.
I see a thread
https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/snapshot/elasticsearch/bCKenCVFf2o/TFK-Es0wxSwJ where
someone else was seeing the same thing, but that thread seems to have died.
In my case, snapshots have gone from taking ~5 minutes to taking about
an hour, even between snapshots where data does not seem to have changed.

For example, you can see below a list of the snapshots stored in my S3
repo. Each snapshot is named with a timestamp of when my cron job invoked
the snapshot process. The S3 timestamp on the left shows the completion
time of that snapshot, and it's clear that it's steadily increasing:

2014-09-30 10:05 686
s3:///snapshot-2014.09.30-10:00:01
2014-09-30 12:05 686
s3:///snapshot-2014.09.30-12:00:01
2014-09-30 14:05 736
s3:///snapshot-2014.09.30-14:00:01
2014-09-30 16:05 736
s3:///snapshot-2014.09.30-16:00:01
...
2014-11-08 00:52 1488
s3:///snapshot-2014.11.08-00:00:01
2014-11-08 02:54 1488
s3:///snapshot-2014.11.08-02:00:01
...
2014-11-08 14:54 1488
s3:///snapshot-2014.11.08-14:00:01
2014-11-08 16:53 1488
s3:///snapshot-2014.11.08-16:00:01
...
2014-11-11 07:00 1638
s3:///snapshot-2014.11.11-06:00:01
2014-11-11 08:58 1638
s3:///snapshot-2014.11.11-08:00:01
2014-11-11 10:58 1638
s3:///snapshot-2014.11.11-10:00:01
2014-11-11 12:59 1638
s3:///snapshot-2014.11.11-12:00:01
2014-11-11 15:00 1638
s3:///snapshot-2014.11.11-14:00:01
2014-11-11 17:00 1638
s3:///snapshot-2014.11.11-16:00:01

I suspected that this gradual increase was related to the accumulation
of old snapshots after I tested the following:

I created a brand new cluster with the same hardware specs in the
same datacenter and restored a snapshot of the problematic cluster taken
few days back (i.e. not the latest snapshot).

I then backed up that restored data to a new empty bucket in the same
S3 region, and that was very fast...a minute or less.

I then restored a later snapshot of the problematic cluster to the
test cluster and tried backing it up again to the new bucket, and that also
took about a minute or less.

However, when I tried deleting the repository full of old snapshots from
the problematic cluster and registering a brand new empty bucket, I found
that my first snapshot to the new repository was also hanging indefinitely.
I finally had to kill my snapshot curl command. There were no errors in the
logs (the snapshot logger is very terse...wondering if anyone knows how to
increase the verbosity for it).

So my theory seems to have been debunked, and I am again at a loss. I am
wondering whether the hanging snapshot is related to the slow snapshots I
was seeing before I deleted that old repository. I have seen several issues
in GitHub regarding hanging snapshots (#5958
https://github.com/elasticsearch/elasticsearch/issues/5958, #7980
https://github.com/elasticsearch/elasticsearch/issues/7980) and have
tried using the elasticsearch-snapshot-cleanup
https://github.com/imotov/elasticsearch-snapshot-cleanup utility on
my cluster both before and after I upgraded from version 1.2.2 to 1.4.0 (I
thought upgrading to 1.4.0 which included snapshot improvements may fix my
issues, but it did not), and the script is not finding any running
snapshots:

[2014-11-13 05:37:45,451][INFO ][org.elasticsearch.node ] [Golden
Archer] started
[2014-11-13 05:37:45,451][INFO
][org.elasticsearch.org.motovs.elasticsearch.snapshots.AbortedSnapshotCleaner]
No snapshots found
[2014-11-13 05:37:45,452][INFO ][org.elasticsearch.node ] [Golden
Archer] stopping ...

Curling to _snapshot/REPO/_status also returns no ongoing snapshots:

curl -XGET
'http://:9200/_snapshot/s3_backup_repo/_status?pretty=true'
{
"snapshots" :
}

I may try bouncing ES on each node to see if that kills whatever process
is causing my requests to the snapshot module to hang (requests to other
modules like _cluster/health returns fine; cluster health is green, and
load is low for both nodes - 0.00, 0.06).

I would really appreciate some help/guidance on how to debug/fix this
issue and general recommendations on how to best achieve periodic
snapshots. For example, cleaning up old snapshots seems rather difficult
since we have to specify the snapshot name, which we would obtain by making
a request to the snapshot module, which seems to hang often.

Thanks,
Sally

On Monday, November 10, 2014 12:27:10 AM UTC-8, Pradeep Reddy wrote:

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic snapshot
be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose
perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <
pradeepreddy...@gmail.com> wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice as
you may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to
delete old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

--
You received this message because you are subscribed to the Google
Groups "elasticsearch" group.
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send an email to elasticsearc...@googlegroups.com.
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theuntergeek · December 3, 2014, 12:27pm

I will include my response to the original post:

Snapshots are at the segment level. The more segments stored in the

repository, the more segments will have to be compared to those in each
successive snapshot. With merges taking place continually in an active
index, you may end up with a considerable number of "orphaned" segments
stored in your repository, i.e. segments "backed up," but no longer
directly correlating to a segment in your index. Checking through these
may be contributing to the increased amount of time between snapshots.

Consider pruning older snapshots. "Orphaned" segments will be deleted,
and any segments still referenced will be preserved.

On Thursday, November 20, 2014 7:22:03 AM UTC-5, João Costa wrote:

Hello,

Sorry for hijacking this thread, but I'm currently also pondering the best
way to perform periodic snapshots in AWS.

My main concern is that we are using blue-green deployment with ephemeral
storage on EC2, so if for some reason there is a problem with the cluster,
we might lose a lot of data, therefore I would rather do frequent snapshots
(for this reason, we are still using the deprecated S3 gateway).

The thing is, you claim that "Having too many snapshots is problematic"
and that one should "prune old snapshots". Since snapshots are incremental,
this will imply data loss, correct?
Also, is the problem related to the number of snapshots or the size of the
data? Is there any way to merge old snapshots into one? Would this solve
the problem?

Finally, if I create a cronjob to make automatic snapshots, can I run into
problems if two instances attempt to create a snapshot with the same name
at the same time?
Also, what's the best way to do a snapshot on shutdown? Should I put a
script on init.d/rc.0 to run on shutdown before elasticsearch shuts down?
I've seen cases where the EC2 instances have "not so grateful" shutdowns,
so it would be wonder if there is a better way to do this on a cluster
level (ie, if a node A notices that a node B is not responding, then it
automatically makes a snapshot).

Sorry if some of these questions don't make much sense, I'm still quite
new to elasticsearch and have not completly understood the new snapshot
feature.

Em sexta-feira, 14 de novembro de 2014 08h19min42s UTC, Sally Ahn escreveu:

Yes, I am now seeing the snapshots complete in about 2 minutes after
switching to a new, empty bucket.
I'm not sure why the initial request to snapshot to the empty repo was
hanging because the snapshot did in fact complete in about 2 minutes,
according to the S3 timestamp.
Time to automate deletion of old snapshots.
Thanks for the response!

On Thursday, November 13, 2014 9:35:20 PM UTC-8, Igor Motov wrote:

Having too many snapshots is problematic. Each snapshot is done in
incremental manner, so in order to figure out what changes and what is
available all snapshots in the repository needs to be scanned, which takes
time as number of snapshots growing. I would recommend pruning old
snapshots as time goes by or starting snapshots into a new bucket/directory
if you really need to maintain 2 hour resolution for 2 months old
snapshots. The get command can sometimes hang because it's throttled by the
on-going snapshot.

On Wednesday, November 12, 2014 9:02:33 PM UTC-10, Sally Ahn wrote:

I am also interested in this topic.
We were snapshotting our cluster of two nodes every 2 hours (invoked
via a cron job) to an S3 repository (we were running ES 1.2.2 with
cloud-aws-plugin version 2.2.0, then we upgraded to ES 1.4.0 with
cloud-aws-plugin 2.4.0 but are still seeing issues described below).
I've been seeing an increase in the time it takes to complete a
snapshot with each subsequent snapshot.
I see a thread
https://groups.google.com/forum/?fromgroups#!searchin/elasticsearch/snapshot/elasticsearch/bCKenCVFf2o/TFK-Es0wxSwJ where
someone else was seeing the same thing, but that thread seems to have died.
In my case, snapshots have gone from taking ~5 minutes to taking about
an hour, even between snapshots where data does not seem to have changed.

For example, you can see below a list of the snapshots stored in my S3
repo. Each snapshot is named with a timestamp of when my cron job invoked
the snapshot process. The S3 timestamp on the left shows the completion
time of that snapshot, and it's clear that it's steadily increasing:

2014-09-30 10:05 686
s3:///snapshot-2014.09.30-10:00:01
2014-09-30 12:05 686
s3:///snapshot-2014.09.30-12:00:01
2014-09-30 14:05 736
s3:///snapshot-2014.09.30-14:00:01
2014-09-30 16:05 736
s3:///snapshot-2014.09.30-16:00:01
...
2014-11-08 00:52 1488
s3:///snapshot-2014.11.08-00:00:01
2014-11-08 02:54 1488
s3:///snapshot-2014.11.08-02:00:01
...
2014-11-08 14:54 1488
s3:///snapshot-2014.11.08-14:00:01
2014-11-08 16:53 1488
s3:///snapshot-2014.11.08-16:00:01
...
2014-11-11 07:00 1638
s3:///snapshot-2014.11.11-06:00:01
2014-11-11 08:58 1638
s3:///snapshot-2014.11.11-08:00:01
2014-11-11 10:58 1638
s3:///snapshot-2014.11.11-10:00:01
2014-11-11 12:59 1638
s3:///snapshot-2014.11.11-12:00:01
2014-11-11 15:00 1638
s3:///snapshot-2014.11.11-14:00:01
2014-11-11 17:00 1638
s3:///snapshot-2014.11.11-16:00:01

I suspected that this gradual increase was related to the accumulation
of old snapshots after I tested the following:

I created a brand new cluster with the same hardware specs in the
same datacenter and restored a snapshot of the problematic cluster taken
few days back (i.e. not the latest snapshot).

I then backed up that restored data to a new empty bucket in the
same S3 region, and that was very fast...a minute or less.

I then restored a later snapshot of the problematic cluster to the
test cluster and tried backing it up again to the new bucket, and that also
took about a minute or less.

However, when I tried deleting the repository full of old snapshots
from the problematic cluster and registering a brand new empty bucket, I
found that my first snapshot to the new repository was also hanging
indefinitely. I finally had to kill my snapshot curl command. There were no
errors in the logs (the snapshot logger is very terse...wondering if anyone
knows how to increase the verbosity for it).

So my theory seems to have been debunked, and I am again at a loss. I
am wondering whether the hanging snapshot is related to the slow snapshots
I was seeing before I deleted that old repository. I have seen several
issues in GitHub regarding hanging snapshots (#5958
https://github.com/elasticsearch/elasticsearch/issues/5958, #7980
https://github.com/elasticsearch/elasticsearch/issues/7980) and have
tried using the elasticsearch-snapshot-cleanup
https://github.com/imotov/elasticsearch-snapshot-cleanup utility on
my cluster both before and after I upgraded from version 1.2.2 to 1.4.0 (I
thought upgrading to 1.4.0 which included snapshot improvements may fix my
issues, but it did not), and the script is not finding any running
snapshots:

[2014-11-13 05:37:45,451][INFO ][org.elasticsearch.node ] [Golden
Archer] started
[2014-11-13 05:37:45,451][INFO
][org.elasticsearch.org.motovs.elasticsearch.snapshots.AbortedSnapshotCleaner]
No snapshots found
[2014-11-13 05:37:45,452][INFO ][org.elasticsearch.node ] [Golden
Archer] stopping ...

Curling to _snapshot/REPO/_status also returns no ongoing snapshots:

curl -XGET
'http://:9200/_snapshot/s3_backup_repo/_status?pretty=true'
{
"snapshots" :
}

I may try bouncing ES on each node to see if that kills whatever
process is causing my requests to the snapshot module to hang (requests to
other modules like _cluster/health returns fine; cluster health is green,
and load is low for both nodes - 0.00, 0.06).

I would really appreciate some help/guidance on how to debug/fix this
issue and general recommendations on how to best achieve periodic
snapshots. For example, cleaning up old snapshots seems rather difficult
since we have to specify the snapshot name, which we would obtain by making
a request to the snapshot module, which seems to hang often.

Thanks,
Sally

On Monday, November 10, 2014 12:27:10 AM UTC-8, Pradeep Reddy wrote:

Hi Vineeth,

Thanks for the reply.
I am aware of how to create and delete snapshots using cloud-aws.

What I wanted to know was how should the work flow of periodic
snapshot be?especially how to deal with old snapshots? having too many old
snapshots- will this impact something?

On Friday, November 7, 2014 8:16:05 PM UTC+5:30, vineeth mohan wrote:

Hi ,

There is a s3 repository plugin -
GitHub - elastic/elasticsearch-cloud-aws: AWS Cloud Plugin for Elasticsearch
Use this.
The snapshots are incremental , so it should fit your purpose
perfectly.

Thanks
Vineeth

On Fri, Nov 7, 2014 at 3:22 PM, Pradeep Reddy <
pradeepreddy...@gmail.com> wrote:

I want to backup the data every 15-30 min. I will be storing the
snapshots in S3.

DELETE old and then PUT new snapshot many not be the best practice
as you may end up with nothing if something goes wrong.

Using timestamp for snapshot names may be one option, but how to
delete old snapshots then?
Does S3 life management cycle help to delete old snapshots?

Looking forward to get some opinions on this.

--
You received this message because you are subscribed to the Google
Groups "elasticsearch" group.
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For more options, visit https://groups.google.com/d/optout.

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