Failed to write shard state – 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 analyzes 2 JSON files to detect many errors.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

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

Log Context

Log “failed to write shard state” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                 final ShardStateMetaData newShardStateMetadata = new ShardStateMetaData(newRouting.version(); newRouting.primary();
                logger.trace("{} writing shard state; reason [{}]"; shardId; writeReason);
                ShardStateMetaData.FORMAT.write(newShardStateMetadata; newShardStateMetadata.version; shardPath().getShardStatePath());
            } catch (IOException e) { // this is how we used to handle it.... :(
                logger.warn("failed to write shard state"; e);
                // we failed to write the shard state; we will try and write
                // it next time...


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