Failed to sync commit – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 6.8-7.17

Briefly, this error occurs when Elasticsearch is unable to synchronize the commit operation. This could be due to a network issue, disk space issue, or a problem with the underlying storage system. To resolve this issue, you can try the following: 1) Check and ensure that there is sufficient disk space available. 2) Verify the network connectivity between the nodes. 3) Check the health of the underlying storage system. 4) If the problem persists, consider restarting the Elasticsearch node.

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

Log Context

Log “failed to sync commit” class name is We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 logger.debug("successfully sync committed. sync id [{}]."; syncId);
 lastCommittedSegmentInfos = store.readLastCommittedSegmentsInfo();
 return SyncedFlushResult.SUCCESS;
 } catch (IOException ex) {
 maybeFailEngine("sync commit"; ex);
 throw new EngineException(shardId; "failed to sync commit"; ex);
 }  final boolean tryRenewSyncCommit() {
 boolean renewed = false;