Empty snapshots

tmslara.a · February 9, 2023, 8:47pm

Hi,

I have a problem when trying to create and restore a snapshot in Elasticsearch. The snapshots are blank.

Some specifications:

I'm using a Mac (MacOS Monterey 12.6.2) if relevant. I'm running Elasticsearch in it and my idea is to generate snapshots in the same computer (for testing).
Elasticsearch 8.6.0
Kibana 8.6.0

I followed these instructions:

Register the repo
Create the snapshot I'm creating it manually, without a SLM policy.
Restore the snapshot

I configured the elasticsearch.yml file including the path.repo:/Users/my_backups

To register the snapshot repository I'm doing

curl -X PUT "localhost:9200/_snapshot/testing_backup?verify=true&pretty"
{
  "type": "fs",
  "settings": {
    "location": "testing_backup_location"
  }
}

# Receiving the response:
{
  "acknowledged" : true
}

To create the snapshot I'm using:

curl -X PUT "localhost:9200/_snapshot/testing_backup/testing_snapshot?wait_for_completion=true&pretty"
{
  "indices": "test_index"
}

Finally, when I checking the snapshots I get

curl -X GET localhost:9200/_snapshot/testing_backup/_current?pretty
{
  "snapshots" : [ ],
  "total" : 0,
  "remaining" : 0
}

# And
curl -X GET localhost:9200/_snapshot/_status?pretty
{
  "snapshots" : [ ]
}

I tried recovering an index from a created snapshot. Using Kibana I observed that the index was created along its mapping but there was no information (size 0B also).

Any insights will be very appreciated.
Best regards,

warkolm · February 9, 2023, 10:46pm

What is the response for that?

tmslara.a · February 10, 2023, 12:50pm

{
  "snapshot" : {
    "snapshot" : "testing_snapshot",
    "uuid" : "PsrjsuGtQ16SnIamdY9FsA",
    "repository" : "testing_backup",
    "version_id" : 8060099,
    "version" : "8.6.0",
    "indices" : [
      ".geoip_databases",
      ".kibana_8.6.0_001",
      ".apm-agent-configuration",
      "test_index",
      ".kibana_task_manager_8.6.0_001",
      ".apm-custom-link"
    ],
    "data_streams" : [ ],
    "include_global_state" : true,
    "state" : "SUCCESS",
    "start_time" : "2023-02-09T20:38:12.132Z",
    "start_time_in_millis" : 1675975092132,
    "end_time" : "2023-02-09T20:38:18.638Z",
    "end_time_in_millis" : 1675975098638,
    "duration_in_millis" : 6506,
    "failures" : [ ],
    "shards" : {
      "total" : 6,
      "failed" : 0,
      "successful" : 6
    },
    "feature_states" : [
      {
        "feature_name" : "geoip",
        "indices" : [
          ".geoip_databases"
        ]
      },
      {
        "feature_name" : "kibana",
        "indices" : [
          ".apm-custom-link",
          ".kibana_8.6.0_001",
          ".apm-agent-configuration",
          ".kibana_task_manager_8.6.0_001"
        ]
      }
    ]
  }
}

Ayush_Mathur · February 10, 2023, 3:08pm

Can you also provide the output for GET _snapshot/testing_backup/testing_snapshot ?

tmslara.a · February 10, 2023, 3:14pm

Sure. Here it is

{
  "snapshots" : [
    {
      "snapshot" : "testing_snapshot",
      "uuid" : "PsrjsuGtQ16SnIamdY9FsA",
      "repository" : "testing_backup",
      "version_id" : 8060099,
      "version" : "8.6.0",
      "indices" : [
        ".geoip_databases",
        ".kibana_8.6.0_001",
        ".apm-agent-configuration",
        "test_index",
        ".kibana_task_manager_8.6.0_001",
        ".apm-custom-link"
      ],
      "data_streams" : [ ],
      "include_global_state" : true,
      "state" : "SUCCESS",
      "start_time" : "2023-02-09T20:38:12.132Z",
      "start_time_in_millis" : 1675975092132,
      "end_time" : "2023-02-09T20:38:18.638Z",
      "end_time_in_millis" : 1675975098638,
      "duration_in_millis" : 6506,
      "failures" : [ ],
      "shards" : {
        "total" : 6,
        "failed" : 0,
        "successful" : 6
      },
      "feature_states" : [
        {
          "feature_name" : "geoip",
          "indices" : [
            ".geoip_databases"
          ]
        },
        {
          "feature_name" : "kibana",
          "indices" : [
            ".apm-custom-link",
            ".kibana_8.6.0_001",
            ".apm-agent-configuration",
            ".kibana_task_manager_8.6.0_001"
          ]
        }
      ]
    }
  ],
  "total" : 1,
  "remaining" : 0
}

Ayush_Mathur · February 10, 2023, 3:59pm

Ok, so the snapshot was successful and your test_index is present. When the snapshot was taken, did you have any documents stored in it ?
Can you please try

POST _snapshot/testing_backup/testing_snapshot/_restore
{
  "indices": "test_index"
}

followed by GET _cat/indices/test_index?v and provide the output ?

tmslara.a · February 10, 2023, 4:23pm

Yes, if before creating the snapshot I do

curl -X GET "localhost:9200/_cat/indices/test_index?v&pretty"

# I receive 
health status index       uuid                   pri rep docs.count docs.deleted store.size pri.store.size
yellow open   test_index B-j4fJQCR5qYafsh01yaQg   1   1    2010722            0    183.9mb        183.9mb

Mmm, but this will try to restore the test_index, which already exists. Is it OK? In my previous attempts I tried deleting the index and then restoring it, as described in Restore the snapshot

Ayush_Mathur · February 10, 2023, 4:28pm

Ahh right, may be try like this then:

POST _snapshot/testing_backup/testing_snapshot/_restore
{
  "indices": "test_index",
  "rename_pattern": "(.+)",
  "rename_replacement": "restored-$1"
}

followed by GET _cat/indices/restored*?v

DavidTurner · February 10, 2023, 4:55pm

GET _snapshot/$REPO/_current only shows the currently-running snapshots, so it will return an empty list if the snapshot completed. You want GET _snapshot/$REPO/_all.

Similarly, GET _snapshot/_status only returns the status of currently-running snapshots.

tmslara.a · February 10, 2023, 5:22pm

I got

{"accepted":true}

I got

health status index                uuid                   pri rep docs.count docs.deleted store.size pri.store.size
red    open   restored-test_index 16WPI_uGQRavBQ8VZqV0sQ   1   1

tmslara.a · February 10, 2023, 5:25pm

I got the same information that I received using

GET _snapshot/testing_backup/testing_snapshot

Ayush_Mathur · February 10, 2023, 5:37pm

OK, wait for some time, the index needs to be green first before data can be restored to it. The restoration can take some time since restoration speed will depend on your network bandwidth and repository configuration.

tmslara.a · February 10, 2023, 5:47pm

test_index, the index that I'm trying to get the snapshot from, is yellow. Is it relevant?

Ayush_Mathur · February 10, 2023, 6:10pm

@DavidTurner I guess this shouldn't be an issue right ? Essentially the primary shard is available to take snapshot from.
@tmslara.a is your restored-test_index also yellow or is it still red ? If red, can you please check GET _cat/shards/restored*?v&h=name,status and GET _cluster/allocation/explain to get details on why the shard is not being initialized ?

tmslara.a · February 10, 2023, 6:30pm

This is empty, I don't receive anything back.

I got

{
  "note" : "No shard was specified in the explain API request, so this response explains a randomly chosen unassigned shard. There may be other unassigned shards in this cluster which cannot be assigned for different reasons. It may not be possible to assign this shard until one of the other shards is assigned correctly. To explain the allocation of other shards (whether assigned or unassigned) you must specify the target shard in the request to this API.",
  "index" : "restored-test_index",
  "shard" : 0,
  "primary" : true,
  "current_state" : "unassigned",
  "unassigned_info" : {
    "reason" : "NEW_INDEX_RESTORED",
    "at" : "2023-02-10T17:19:11.263Z",
    "details" : "restore_source[testing_backup/testing_snapshot]",
    "last_allocation_status" : "no"
  },
  "can_allocate" : "no",
  "allocate_explanation" : "Elasticsearch isn't allowed to allocate this shard to any of the nodes in the cluster. Choose a node to which you expect this shard to be allocated, find this node in the node-by-node explanation, and address the reasons which prevent Elasticsearch from allocating this shard there.",
  "node_allocation_decisions" : [
    {
      "node_id" : "LWcDogKwQ7u0GPRogQHUEA",
      "node_name" : "Tomass-MacBook-Pro.local",
      "transport_address" : "127.0.0.1:9300",
      "node_attributes" : {
        "ml.machine_memory" : "8589934592",
        "xpack.installed" : "true",
        "ml.allocated_processors_double" : "4.0",
        "ml.max_jvm_size" : "4294967296",
        "ml.allocated_processors" : "4"
      },
      "node_decision" : "no",
      "weight_ranking" : 1,
      "deciders" : [
        {
          "decider" : "restore_in_progress",
          "decision" : "NO",
          "explanation" : "shard has failed to be restored from the snapshot [testing_backup:testing_snapshot/iU6x5kj5S9CgkrBLcO6Plw] - manually close or delete the index [restored-test_index] in order to retry to restore the snapshot again or use the reroute API to force the allocation of an empty primary shard. Details: [restore_source[testing_backup/testing_snapshot]]"
        }
      ]
    }
  ]
}

tmslara.a · February 10, 2023, 6:34pm

I think the yellow status is normal since I'm doing everything in a single node (my PC).

Ayush_Mathur · February 10, 2023, 6:54pm

Guess we need to wait for this task to be completed first.

tmslara.a · February 13, 2023, 7:46pm

Everything still the same

system · March 13, 2023, 7:46pm

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