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

Opster Team

Aug-23, Version: 1-2.9

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Briefly, this error occurs when OpenSearch fails to reassign unassigned shards due to issues like node failures, insufficient resources, or network problems. To resolve this, you can manually reroute the unassigned shards using the cluster reroute API. Ensure that there are enough resources (CPU, memory, disk space) on the nodes. Check the network connectivity between nodes. If a node has failed, try to recover it or add a new node to the cluster. Lastly, consider enabling shard allocation if it’s disabled.

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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 OpenSearch concepts: routing, cluster, shard.

Log Context

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

                    clusterService.submitStateUpdateTask(CLUSTER_UPDATE_TASK_SOURCE; DelayedRerouteTask.this);
                }

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

 

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