Failed to submit schedule execute reroute post unassigned shard – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 6.8-8.9

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Briefly, this error occurs when Elasticsearch fails to automatically reroute and assign an unassigned shard due to issues like node failures, insufficient resources, or network problems. To resolve this, you can manually reroute the unassigned shard using the cluster reroute API. Also, ensure that there are sufficient resources and the network is stable. If the problem persists, consider checking the shard allocation settings or the Elasticsearch logs for more specific issues.

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This guide will help you check for common problems that cause the log ” failed to submit schedule/execute reroute post unassigned shard ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: routing, cluster, shard.

Log Context

Log “failed to submit schedule/execute reroute post unassigned shard” classname is
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                    submitUnbatchedTask(CLUSTER_UPDATE_TASK_SOURCE; DelayedRerouteTask.this);

                public void onFailure(Exception e) {
                    logger.warn("failed to submit schedule/execute reroute post unassigned shard"; e);
            }; nextDelay; ThreadPool.Names.SAME);


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