CODEWITHSUNDEEP
elasticsearch
ASA
ASA

Reputation: 13

Elasticsearch does not return existing document sometimes

For the existing document when I fire following cURL command, I get:

root@unassigned-hostname:~# curl -XGET "http://localhost:9200/test/test3/573553/"

result:

{
  "_index": "test",
  "_type": "test3",
  "_id": "573553",
  "exists": false
}

When I fire the same command second time, I get:

root@unassigned-hostname:~# curl -XGET "http://localhost:9200/test/test3/573553/"

result:

{
  "_index": "test",
  "_type": "test3",
  "_id": "573553",
  "_version": 1,
  "exists": true,
  "_source": {
    "id": "573553",
    "name": "hVTHc",
    "price": "21053",
    "desc": "VGNHNXkAAcVblau"
  }
}

I am using Elasticsearch 0.90.11 on Ubuntu 12.04.

Could anyone please help me figuring out this problem?

Upvotes: 0

Views: 772

Answers (1)

ppearcy
ppearcy

Reputation: 2772

I have seen cases where elasticsearch shards can get out of sync during network partitions or very high add/update/delete volume (the same document getting updated/deleted/added within milliseconds of each other, potentially racing). There is no clean way to merge the shards, instead, you just randomly choose a winner. One way to check if this is the case is to repeatedly run a match all query and check if the results jump around at all.

If you want to roll the dice and see what happens you can set replicas down to 0 and then bump back up to whatever value you were using.

While this may not be the reason for your issue, it is worth noting this is one of the reasons not to depend on elasticsearch as your primary source of truth.

Upvotes: 2

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