Cannot open ccr restore session if shard closed – How to solve this Elasticsearch error

Opster Team

March-22, Version: 1.7-8.0

Before you begin reading this guide, we recommend you try running the Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many configuration 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 ” cannot open ccr restore session if shard closed ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: shard, repository, restore, plugin.


Log Context

Log “cannot open ccr restore session if shard closed”classname  is CcrRestoreSourceService.java We extracted the following from Elasticsearch source code for those seeking an in-depth context :

logger.debug("not opening new session [{}] as it already exists"; sessionUUID);
 restore = onGoingRestores.get(sessionUUID);
 } else {
 logger.debug("opening session [{}] for shard [{}]"; sessionUUID; indexShard.shardId());
 if (indexShard.state() == IndexShardState.CLOSED) {
 throw new IndexShardClosedException(indexShard.shardId(); "cannot open ccr restore session if shard closed");
 }
 restore = new RestoreSession(sessionUUID; indexShard; indexShard.acquireSafeIndexCommit(); scheduleTimeout(sessionUUID));
 onGoingRestores.put(sessionUUID; restore);
 HashSet sessions = sessionsForShard.computeIfAbsent(indexShard; (s) -> new HashSet<>());
 sessions.add(sessionUUID);

 

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