Difference in the calculated score among the configured es servers for the same query in same time

Elastic Stack Elasticsearch
1

Hi All

I have 3 unique servers for elasticsearch, i made the cluster setup in this.

Each and every index has 5 shards and 2 replicas. i have an index with 4
lac of documents in it. while perform a search query in the elasticsearch
cluster. the returned documents have different calculated score in
different servers.

ex

Document Server 1 Server 2 Server 3
-----------------------------------------------------
documentA 49.379543 50.168644 49.577785
documentB 17.744095 17.979729 18.046381
documentC 16.880697 16.748943 16.850113
documentD 10.785672 10.744943 10.806508
.
.

search_type*=dfs_query_then_fetch*

This is because of the document frequency. but i can;t understand that all
are calculated in shard0 itself. if we set the search preference to
_primary then the score same for all the request (means all the servers).
obviously this should be. Because there is no other search hits for the
replicas.

My Question is: what's happen if the search hits the replicas? it
calculates different score in different servers?

Thanks

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2

Hi All

Any updates

On Friday, 6 March 2015 19:27:07 UTC+5:30, Shanmugam wrote:

Hi All

I have 3 unique servers for elasticsearch, i made the cluster setup in
this.

Each and every index has 5 shards and 2 replicas. i have an index with 4
lac of documents in it. while perform a search query in the elasticsearch
cluster. the returned documents have different calculated score in
different servers.

ex

Document Server 1 Server 2 Server 3
-----------------------------------------------------
documentA 49.379543 50.168644 49.577785
documentB 17.744095 17.979729 18.046381
documentC 16.880697 16.748943 16.850113
documentD 10.785672 10.744943 10.806508
.
.

search_type*=dfs_query_then_fetch*

This is because of the document frequency. but i can;t understand that all
are calculated in shard0 itself. if we set the search preference to
_primary then the score same for all the request (means all the servers).
obviously this should be. Because there is no other search hits for the
replicas.

My Question is: what's happen if the search hits the replicas? it
calculates different score in different servers?

Thanks

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3

Scores are based on the docs in the particular shard that is queried, so
it's relative.

On 19 March 2015 at 05:19, Shanmugam shanmuthu83@gmail.com wrote:

Hi All

Any updates

On Friday, 6 March 2015 19:27:07 UTC+5:30, Shanmugam wrote:

Hi All

I have 3 unique servers for elasticsearch, i made the cluster setup in
this.

Each and every index has 5 shards and 2 replicas. i have an index with 4
lac of documents in it. while perform a search query in the elasticsearch
cluster. the returned documents have different calculated score in
different servers.

ex

Document Server 1 Server 2 Server 3
-----------------------------------------------------
documentA 49.379543 50.168644 49.577785
documentB 17.744095 17.979729 18.046381
documentC 16.880697 16.748943 16.850113
documentD 10.785672 10.744943 10.806508
.
.

search_type*=dfs_query_then_fetch*

This is because of the document frequency. but i can;t understand that
all are calculated in shard0 itself. if we set the search preference to
_primary then the score same for all the request (means all the servers).
obviously this should be. Because there is no other search hits for the
replicas.

My Question is: what's happen if the search hits the replicas? it
calculates different score in different servers?

Thanks

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.
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