How To Solve Issues Related to Log – Engine failed; but cant find index shard. failure reason:

How To Solve Issues Related to Log – Engine failed; but cant find index shard. failure reason:

Updated: Feb-20

Elasticsearch Version: 1.7-8.0

Background

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To troubleshoot log “Engine failed; but cant find index shard. failure reason:” it’s important to understand a few problems related to Elasticsearch concepts cluster, indices. See bellow important tips and explanations on these concepts

Log Context

Log”[{}][{}] engine failed; but can't find index shard. failure reason: [{}]” classname is IndicesClusterStateService.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 if (indexShard != null) {
                    shardRouting = indexShard.routingEntry();
                }
            }
            if (shardRouting == null) {
                logger.warn("[{}][{}] engine failed; but can't find index shard. failure reason: [{}]"; failure;
                        shardId.index().name(); shardId.id(); reason);
                return;
            }
            final ShardRouting fShardRouting = shardRouting;
            threadPool.generic().execute(new Runnable() {




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 Snapshot Failed With Partial State  

Failed To Send Ping To Node After O  

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