Thread interrupted while trying to obtain shard lock – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-8.9

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Briefly, this error occurs when a thread in Elasticsearch is interrupted while trying to lock a shard for operations like indexing or searching. This could be due to high load, slow disk I/O, or a long garbage collection pause. To resolve this issue, you can optimize your queries to reduce load, upgrade your hardware for faster disk I/O, or adjust JVM settings to minimize garbage collection pauses. Additionally, ensure that your cluster is properly sized and not overloaded with too many shards.

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This guide will help you check for common problems that cause the log ” thread interrupted while trying to obtain shard lock ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, thread.

Log Context

Log “thread interrupted while trying to obtain shard lock” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 maybeLogThreadDump(shardId; message);
 throw new ShardLockObtainFailedException(shardId; message);
 } catch (InterruptedException e) {
 throw new ShardLockObtainFailedException(shardId; "thread interrupted while trying to obtain shard lock"; e);
 }  public void setDetails(String details) {
 lockDetails = Tuple.tuple(System.nanoTime(); details);


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