Failed to sync translog – How to solve this OpenSearch error

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch is unable to synchronize the transaction log (translog). The translog is crucial for data recovery, as it records all operations that occur in the system. This error could be due to insufficient disk space, file system issues, or network connectivity problems. To resolve this, you can try freeing up disk space, checking the file system for errors, or troubleshooting network issues. Additionally, ensure that the OpenSearch process has the necessary permissions to write to the translog directory.

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This guide will help you check for common problems that cause the log ” failed to sync translog ” to appear. To understand the issues related to this log, read the explanation below about the following OpenSearch concepts: index.

Log Context

Log “failed to sync translog” classname is
We extracted the following from OpenSearch source code for those seeking an in-depth context :

                } catch (AlreadyClosedException ex) {
                    // fine - continue;
                } catch (IOException e) {
                    logger.warn("failed to sync translog"; e);


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