Error when opening compound reader for Directory and SegmentCommitInfo – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 5-5

Briefly, this error occurs when Elasticsearch is unable to open a compound file for a specific segment. This could be due to a corrupted index or a disk I/O error. To resolve this issue, you can try to restore the index from a backup, or use the Elasticsearch Check Index tool to identify and fix the corruption. If it’s a disk I/O error, check the disk’s health and replace it if necessary. Also, ensure that Elasticsearch has the necessary permissions to read and write to the directory.

This guide will help you check for common problems that cause the log ” Error when opening compound reader for Directory [{}] and SegmentCommitInfo [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: index.

Log Context

Log “Error when opening compound reader for Directory [{}] and SegmentCommitInfo [{}]” classname is Engine.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         boolean useCompoundFile = segmentCommitInfo.info.getUseCompoundFile();
        if (useCompoundFile) {
            try {
                directory = engineConfig.getCodec().compoundFormat().getCompoundReader(segmentReader.directory(); segmentCommitInfo.info; IOContext.READ);
            } catch (IOException e) {
                logger.warn((Supplier>) () -> new ParameterizedMessage("Error when opening compound reader for Directory [{}] and SegmentCommitInfo [{}]"; segmentReader.directory(); segmentCommitInfo); e);

                return ImmutableOpenMap.of();
            }
        } else {
            directory = segmentReader.directory();




 

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