Failed to flush after merge has finished – How to solve related issues

Average Read Time

2 Mins

Failed to flush after merge has finished – How to solve related issues

Opster Team

Jan-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which can resolve issues that cause many errors.

This guide will help you check for common problems that cause the log ” Failed to flush after merge has finished ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: flush, index and merge.

Advanced users might want to skip right to the common problems section in each concept or try running the Check-Up to analyze Elasticsearch configuration and help resolve this error.

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 {


 

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