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Date: Fri, 27 Jan 2017 11:11:24 +0000 (UTC)
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Subject: [jira] [Commented] (FLINK-5122) Elasticsearch Sink loses documents
 when cluster has high load
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archived-at: Fri, 27 Jan 2017 11:11:30 -0000


    [ https://issues.apache.org/jira/browse/FLINK-5122?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15842574#comment-15842574 ] 

ASF GitHub Bot commented on FLINK-5122:
---------------------------------------

Github user static-max commented on the issue:

    https://github.com/apache/flink/pull/2861
  
    In my tests BulkItemResponse.getFailure().getCause() returns a RemoteTransportException like this:
    `RemoteTransportException[[Harrier][127.0.0.1:9302][indices:data/write/bulk[s]]]; nested: RemoteTransportException[[Harrier][127.0.0.1:9302][indices:data/write/bulk[s][p]]]; nested: EsRejectedExecutionException[rejected execution of org.elasticsearch.transport.TransportService$4@3a0f3a6e on EsThreadPoolExecutor[bulk, queue capacity = 2, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@5ac266bd[Running, pool size = 8, active threads = 8, queued tasks = 2, completed tasks = 206]]];`
    
    So the nested Exception needs to be checked. That's possible, I will implement that change.
    
    The last to Exceptions are common when a new Index gets created (if you have new index by day for example), or when a node leaves the cluster and no master can be elected (no quorum),


> Elasticsearch Sink loses documents when cluster has high load
> -------------------------------------------------------------
>
>                 Key: FLINK-5122
>                 URL: https://issues.apache.org/jira/browse/FLINK-5122
>             Project: Flink
>          Issue Type: Bug
>          Components: Streaming Connectors
>    Affects Versions: 1.2.0
>            Reporter: static-max
>            Assignee: static-max
>
> My cluster had high load and documents got not indexed. This violates the "at least once" semantics in the ES connector.
> I gave pressure on my cluster to test Flink, causing new indices to be created and balanced. On those errors the bulk should be tried again instead of being discarded.
> Primary shard not active because ES decided to rebalance the index:
> 2016-11-15 15:35:16,123 ERROR org.apache.flink.streaming.connectors.elasticsearch2.ElasticsearchSink  - Failed to index document in Elasticsearch: UnavailableShardsException[[index-name][3] primary shard is not active Timeout: [1m], request: [BulkShardRequest to [index-name] containing [20] requests]]
> Bulk queue on node full (I set queue to a low value to reproduce error):
> 22:37:57,702 ERROR org.apache.flink.streaming.connectors.elasticsearch2.ElasticsearchSink  - Failed to index document in Elasticsearch: RemoteTransportException[[node1][192.168.1.240:9300][indices:data/write/bulk[s][p]]]; nested: EsRejectedExecutionException[rejected execution of org.elasticsearch.transport.TransportService$4@727e677c on EsThreadPoolExecutor[bulk, queue capacity = 1, org.elasticsearch.common.util.concurrent.EsThreadPoolExecutor@51322d37[Running, pool size = 2, active threads = 2, queued tasks = 1, completed tasks = 2939]]];
> I can try to propose a PR for this.


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