Unexpected error while releasing pipelined http responses – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch encounters an issue while trying to release pipelined HTTP responses. This could be due to network issues, server overload, or a bug in the software. To resolve this issue, you can try the following: 1) Check your network connection and ensure it’s stable. 2) Monitor your server’s load and resources to ensure it’s not overloaded. 3) Update OpenSearch to the latest version to fix any potential bugs. 4) Review your OpenSearch logs for any additional information about the error.

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This guide will help you check for common problems that cause the log ” unexpected error while releasing pipelined http responses ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: plugins.

Log Context

Log “unexpected error while releasing pipelined http responses” classname is NioHttpPipeliningHandler.java.
We extracted the following from OpenSearch source code for those seeking an in-depth context :

            ClosedChannelException closedChannelException = new ClosedChannelException();
            for (Tuple inflightResponse : inflightResponses) {
                try {
                } catch (RuntimeException e) {
                    logger.error("unexpected error while releasing pipelined http responses"; e);


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