Actual Exception – Elasticsearch Log Diagnostic

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Navigate directly to one of the sections in this page :

Troubleshooting Background – start here to get the full picture       
Log Context – usefull for experts
Related Issues – selected resources from the community  
About Opster – offering a diffrent approach to troubleshoot Elasticsearch

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Troubleshooting background

To troubleshoot Elasticsearch log “Actual Exception” it’s important to know common problems related to Elasticsearch concepts: replication. See below-detailed explanations complete with common problems, examples and useful tips.

Replication in Elasticsearch

What it is

Replication refers to storing the redundant copy of the data. Starting from version 7.x, Elasticsearch creates one primary shard with a replication factor set to 1.  Replicas never get assigned on the same node on which primary shards are assigned, which means you should have at least two nodes in the cluster to assign the replicas. If a primary shard goes down, the replica automatically acts as a primary shard.

What it is used for

Replicas are used to provide high availability and failover. A higher number of replicas is also helpful for faster searches.

Examples

Update replication count

PUT /api-logs/_settings?pretty
{
    "index" : {
        "number_of_replicas" : 2
    }
}
Common problems
  • By default, If free disk space usage reaches 85%, the replicas of newly created indices are not assigned on that node and Elasticsearch throws a warning.
  • Creating too many replicas may cause a problem if there are not enough resources available in the cluster. 


Log Context

Log ”Actual Exception” classname is TransportReplicationAction.java
To help get the right context about this log, we have extracted the following from Elasticsearch source code

                 Releasables.close(indexShardReference);
                try {
                    channel.sendResponse(t);
                } catch (IOException responseException) {
                    logger.warn("failed to send error message back to client for action [{}]"; responseException; transportReplicaAction);
                    logger.warn("actual Exception"; t);
                }
            }
        }

        private void doFinish() {






To help troubleshoot related issues we have gathered selected answers from STOF & Discuss and issues from Github, please review the following for further information :

Elasticsearch Net 7 1 0 Issue
discuss.elastic.co/t/elasticsearch-net-7-1-0-issue/193674

 

Querying Elasticsearch With Nest Er
discuss.elastic.co/t/querying-elasticsearch-with-nest-error-input-string-was-not-in-a-correct-format/180353

 


About Opster

Incorporating deep knowledge and broad history of Elasticsearch issues. Opster’s solution identifies and predicts root causes of Elasticsearch problems, provides recommendations and can automatically perform various actions to manage, troubleshoot and prevent issues

We are constantly updating our analysis of Elasticsearch logs, errors, and exceptions. Sharing best practices and providing troubleshooting guides.

Learn more: Glossary | Blog| Troubleshooting guides | Error Repository

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