Log deleting leftover shard on path: with a different index UUID – How To Solve Related Issues

Log deleting leftover shard on path: with a different index UUID – How To Solve Related Issues

Updated: Jan-20

Elasticsearch Version: 1.7-8.0

Background

To resolve issues causing many log errors you can try our Elasticsearch Check-Up it analyses ES configuration to provide actionable recommendations (no installation required) 


To troubleshoot log “deleting leftover shard on path: with a different index UUID” it’s important to understand a few problems related to Elasticsearch concepts index, shard. See bellow important tips and explanations on these concepts

Log Context

Log”{} deleting leftover shard on path: [{}] with a different index UUID” classname is ShardPath.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         for (Path path : paths) {
            // EMPTY is safe here because we never call namedObject
            ShardStateMetaData load = ShardStateMetaData.FORMAT.loadLatestState(logger; NamedXContentRegistry.EMPTY; path);
            if (load != null) {
                if (load.indexUUID.equals(indexUUID) == false && IndexMetaData.INDEX_UUID_NA_VALUE.equals(load.indexUUID) == false) {
                    logger.warn("{} deleting leftover shard on path: [{}] with a different index UUID"; lock.getShardId(); path);
                    assert Files.isDirectory(path) : path + " is not a directory";
                    NodeEnvironment.acquireFSLockForPaths(indexSettings; paths);
                    IOUtils.rm(path);
                }
            }




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 elasticsearch: how to remove unassigned shards

1.95 K 

Github Issue Number 10677  

Old Shards Not Deleted Upon Relocat

 

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