Unexpected failure while failing primary primary routingEntry – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.9

Briefly, this error occurs when Elasticsearch encounters an issue while trying to fail a primary shard. This could be due to network issues, disk space problems, or a bug in Elasticsearch itself. To resolve this issue, you can try restarting the Elasticsearch node, checking for network connectivity issues, ensuring there’s enough disk space, or upgrading Elasticsearch to the latest version to fix potential bugs.

This guide will help you check for common problems that cause the log ” unexpected failure while failing primary [” + primary.routingEntry() + “] ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: replication.

Log Context

Log “unexpected failure while failing primary [” + primary.routingEntry() + “]” classname is ReplicationOperation.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                public void onFailure(Exception e) {
                    assert false : e;
                    logger.error(() -> "unexpected failure while failing primary [" + primary.routingEntry() + "]"; e);
                        new RetryOnPrimaryException(
                            String.format(Locale.ROOT; "unexpected failure while failing primary [%s]"; primary.routingEntry());