Syncing directory – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is trying to synchronize data between different nodes in a cluster and encounters an issue. This could be due to network connectivity problems, insufficient disk space, or a misconfiguration in the cluster settings. To resolve this issue, you can check the network connection between the nodes, ensure there is enough disk space, and verify the cluster settings. Additionally, checking the Elasticsearch logs can provide more detailed information about the cause of the error.

This guide will help you check for common problems that cause the log ” {} syncing directory [{}] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: Index and Memory.

Log Context

Log “{} syncing directory [{}]” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

   "{} fsync files"; shard);
            for (Path moved : movedFiles) {
      "{} syncing [{}]"; shard; moved.getFileName());
                IOUtils.fsync(moved; false);
  "{} syncing directory [{}]"; shard; targetDir);
            IOUtils.fsync(targetDir; true);


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