Unexpected failure while processing shard started – How to solve related issues

Opster Team

Feb-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 ” Unexpected failure while processing shard started ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster and shard.

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 “{} unexpected failure while processing shard started [{}]” classname is ShardStateAction.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                                     shardRoutingToBeApplied.add(shardRouting);
                                    logger.debug("{} will apply shard started {}"; shardRouting.shardId(); shardRoutingEntry);
                                }

                            } catch (Throwable t) {
                                logger.error("{} unexpected failure while processing shard started [{}]"; t; shardRouting.shardId(); shardRouting);
                            }
                        }

                        if (shardRoutingToBeApplied.isEmpty()) {
                            return currentState;




 

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