Global checkpoint sync failed – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to synchronize global checkpoints across all replicas of a shard. This could be due to network issues, heavy load, or a faulty node. To resolve this, you can try the following: 1) Check your network connectivity and ensure all nodes are reachable. 2) Monitor your cluster’s load and consider adding more nodes or increasing resources if it’s consistently high. 3) Identify and fix or replace any faulty nodes. 4) If the issue persists, consider restarting your OpenSearch cluster, but be aware this may cause downtime.

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

Log Context

Log “{} global checkpoint sync failed” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

        final ThreadContext threadContext = threadPool.getThreadContext();
        try (ThreadContext.StoredContext ignore = threadContext.stashContext()) {
            execute(new Request(shardId); ActionListener.wrap(r -> {}; e -> {
                if (ExceptionsHelper.unwrap(e; AlreadyClosedException.class; IndexShardClosedException.class) == null) {
           ParameterizedMessage("{} global checkpoint sync failed"; shardId); e);


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