How To Solve Issues Related to Log – Error closing netty event loop group

How To Solve Issues Related to Log – Error closing netty event loop group

Updated: Jan-20

Elasticsearch Version: 1.7-8.0


Before you begin reading this guide try our beta Elasticsearch Health Check-Up it analyses JSON’s to provide personalized recommendations that can improve your clusters performance.

To troubleshoot log “Error closing netty event loop group” it’s important to understand a few problems related to Elasticsearch concepts netty. See bellow important tips and explanations on these concepts

Log Context

Log”Error closing netty event loop group” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

     protected void stopInternal() {
        Releasables.close(() -> {
            Future> shutdownFuture = eventLoopGroup.shutdownGracefully(0; 5; TimeUnit.SECONDS);
            if (shutdownFuture.isSuccess() == false) {
                logger.warn("Error closing netty event loop group"; shutdownFuture.cause());

            clientBootstrap = null;

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 Tty4 Unexpected Exception In The Se  

W Solve Error Java Lang Classnotfou  

About Opster

Opster detects root causes of Elasticsearch problems, provides automated recommendations and can perform various actions to prevent issues and optimize performance

Find Configuration Errors

Analyze Now