Failed to create shard – 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 ” Failed to create shard ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: cluster, indices 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 “[{}][{}] failed to create shard” classname is IndicesClusterStateService.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 indexShard.routingEntry(shardRouting);
                indexShard.engine().addFailedEngineListener(failedEngineHandler);
            } catch (IndexShardAlreadyExistsException e) {
                // ignore this; the method call can happen several times
            } catch (Throwable e) {
                logger.warn("[{}][{}] failed to create shard"; e; shardRouting.index(); shardRouting.id());
                try {
                    indexService.removeShard(shardId; "failed to create [" + ExceptionsHelper.detailedMessage(e) + "]");
                } catch (IndexShardMissingException e1) {
                    // ignore
                } catch (Throwable e1) {




 

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