How To Solve Issues Related to Log – Unexpected failure applying version 6.8

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Updated: Dec-19

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Troubleshooting background

To troubleshoot Elasticsearch log “Unexpected failure applying version 6.8” it’s important to understand common problems related to Elasticsearch concepts: discovery-azure-classic. See detailed explanations below complete with common problems, examples and useful tips.


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Github Issue Number 32767  

 


Log Context

Log ”Unexpected failure applying [{}]” classname is ZenDiscovery.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                     }
                }

                
Override
                public void onFailure(String source; Exception e) {
                    logger.error(() -> new ParameterizedMessage("unexpected failure applying [{}]"; reason); e);
                    try {
                        // TODO: use cluster state uuid instead of full cluster state so that we don't keep reference to CS around
                        // for too long.
                        pendingStatesQueue.markAsFailed(newClusterState; e);
                    } catch (Exception inner) {


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