Log Failing shard – How To Solve Related Issues



Log Failing shard – How To Solve Related Issues

Opster Team

Jan-20, Version: 1.7-8.0



Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up  which can resolve issues causing many log errors (free and no installation required)

 

This guide will help you check for common problems that cause the log “Failing shard” to appear. It’s important to understand the issues related to the log, so to get started, read the general overview on common issues and tips related to the Elasticsearch concepts: allocation, cluster, routing, shard.


Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up which analyses ES to discover the cause of many errors and provides suitable actionable recommendations. 

Log Context

Log”Failing shard [{}]” classname is AllocationService.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                     failedShardEntry.getFailure(); failedAllocations + 1; currentNanoTime; System.currentTimeMillis(); false;
                    AllocationStatus.NO_ATTEMPT);
                if (failedShardEntry.markAsStale()) {
                    allocation.removeAllocationId(failedShard);
                }
                logger.warn(new ParameterizedMessage("failing shard [{}]"; failedShardEntry); failedShardEntry.getFailure());
                routingNodes.failShard(logger; failedShard; unassignedInfo; indexMetaData; allocation.changes());
            } else {
                logger.trace("{} shard routing failed in an earlier iteration (routing: {})"; shardToFail.shardId(); shardToFail);
            }
        }




 

Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Courier Fetch: shards failed -views 37.65 K ,score 28

Failing to start shard in ElasticSearch IndexShardGatewayRecoveryException “sending failed” -views   13.09 K,score 9

 

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