How To Solve Issues Related to Log – Trying to update state on task with unexpected allocation id

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Updated: Jan-20

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Troubleshooting background

To troubleshoot Elasticsearch log “Trying to update state on task with unexpected allocation id” it’s important to understand common problems related to Elasticsearch concepts: allocation, cluster, persistent, task. See detailed explanations below complete with common problems, examples and useful tips.

Cluster in Elasticsearch

What is it

In Elasticsearch a cluster is a collection of one or more nodes (servers / VMs). A cluster can consist of an unlimited number of nodes. The cluster provides interface for indexing and storing data and search capability across all of the data which is stored in the data nodes

Each cluster has a single master node that is elected by the master eligible nodes. In cases where the master is not available the other connected master eligible nodes elect a new master. Clusters are identified by a unique name, which defaults to “Elasticsearch”.

Persistent in Elasticsearch

What it is

In Elasticsearch, Persistent refers to cluster settings that persist across cluster restarts. This setting is used in Cluster Update API calls. Persistent settings can also be configured in elasticsearch.yml file.

Examples
## enable shard routing
PUT /_cluster/settings
{
    "persistent" : {
        "cluster.routing.allocation.enable" : "all"
    }
}
## enable rebalancing of shards
PUT /_cluster/settings
{
    "persistent" : {
        "cluster.routing.rebalance.enable" : "all"
    }
}
## limit the heap size for fielddata
PUT /_cluster/settings
{
    "persistent" : {
                 “indices.breaker.fielddata.limit”: "30%"
    }
}


To help troubleshoot related issues we have gathered selected Q&A from the community and issues from Github , please review the following for further information :

1 Github Issue Number 23199  

2Github Issue Number 37545  


Log Context

Log ”Trying to update state on task {} with unexpected allocation id {}” classname is PersistentTasksClusterService.java
We have extracted the following from Elasticsearch source code to get an in-depth context :

                 PersistentTasksCustomMetaData.Builder tasksInProgress = builder(currentState);
                if (tasksInProgress.hasTask(taskId; taskAllocationId)) {
                    return update(currentState; tasksInProgress.updateTaskState(taskId; taskState));
                } else {
                    if (tasksInProgress.hasTask(taskId)) {
                        logger.warn("trying to update state on task {} with unexpected allocation id {}"; taskId; taskAllocationId);
                    } else {
                        logger.warn("trying to update state on non-existing task {}"; taskId);
                    }
                    throw new ResourceNotFoundException("the task with id {} and allocation id {} doesn't exist"; taskId; taskAllocationId);
                }






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