Log Failed to flush after merge has finished – How To Solve Related Issues

Log Failed to flush after merge has finished – 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 “Failed to flush after merge has finished” it’s important to understand a few problems related to Elasticsearch concepts flush, index, merge. See bellow important tips and explanations on these concepts

Log Context

Log”Failed to flush after merge has finished” classname is InternalEngine.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 // we deadlock on engine#close for instance.
                engineConfig.getThreadPool().executor(ThreadPool.Names.FLUSH).execute(new AbstractRunnable() {
                    
Override
                    public void onFailure(Exception e) {
                        if (isClosed.get() == false) {
                            logger.warn("failed to flush after merge has finished");
                        }
                    }

                    
Override
                    protected void doRun() throws Exception {


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 Shard unassigned after failing to flush in elastic search

4.01 K 3

Github Issue Number 15333  

Flushnotallowedengineexception Exce

 

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