Failed to disconnect from possible connection leak – 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 properly disconnect from a node or a cluster, potentially leading to a connection leak. This could be due to network issues, overloaded servers, or software bugs. To resolve this issue, you can try the following: 1) Check your network connection and ensure it’s stable. 2) Monitor your server’s resources to ensure it’s not overloaded. 3) Update your OpenSearch version to the latest one, as it might contain bug fixes. 4) Review your OpenSearch configuration and ensure it’s correctly set up.

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This guide will help you check for common problems that cause the log ” failed to disconnect from {}; possible connection leak ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: cluster.

Log Context

Log “failed to disconnect from {}; possible connection leak” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            public void onFailure(Exception e) {
                assert Thread.holdsLock(mutex) == false : "mutex unexpectedly held";
                // we may not have disconnected; but will not retry; so this connection might have leaked
                logger.warn(new ParameterizedMessage("failed to disconnect from {}; possible connection leak"; discoveryNode); e);
                assert false : "failed to disconnect from " + discoveryNode + "; possible connection leak\n" + e;
                onCompletion(ActivityType.DISCONNECTING; e; connectActivity);


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