Failed to write indexing buffer for shard ignoring – 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 write the indexing buffer for a specific shard. This could be due to insufficient disk space, high I/O operations, or a network issue. To resolve this, you can try freeing up disk space, optimizing your I/O operations, or checking your network connectivity. Additionally, ensure that your shard allocation is balanced and not overloading a single node. Lastly, consider increasing the indexing buffer size if it’s too small, but be cautious as it might consume more memory.

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This guide will help you check for common problems that cause the log ” failed to write indexing buffer for shard [{}]; ignoring ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: indices, indexing, shard.

Log Context

Log “failed to write indexing buffer for shard [{}]; ignoring” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :


            public void onFailure(Exception e) {
                logger.warn(() -> new ParameterizedMessage("failed to write indexing buffer for shard [{}]; ignoring"; shard.shardId()); e);

    /** force checker to run now */


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