Updating cluster.routing.allocation.awareness.attributes from to – How to solve related issues

Opster Team

Feb-20, Version: 1.7-8.0

Before you begin reading this guide, we recommend you run Elasticsearch Error Check-Up which analyzes 2 JSON files to detect many errors.

Briefly, this error occurs when there is a change in the value of the cluster.routing.allocation.awareness.attributes setting in Elasticsearch, which determines how Elasticsearch distributes shards across nodes based on certain attributes. To resolve this issue, one can try reverting the change or making sure that the nodes in the cluster have the same attribute values.

To easily locate the root cause and resolve this issue try AutoOps for Elasticsearch & OpenSearch. It diagnoses problems by analyzing hundreds of metrics collected by a lightweight agent and offers guidance for resolving them.

This guide will help you check for common problems that cause the log ” Updating cluster.routing.allocation.awareness.attributes from to ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: allocation, cluster and routing.

Log Context

Log “updating [cluster.routing.allocation.awareness.attributes] from [{}] to [{}]” classname is AwarenessAllocationDecider.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             String[] awarenessAttributes = settings.getAsArray(CLUSTER_ROUTING_ALLOCATION_AWARENESS_ATTRIBUTES; null);
            if (awarenessAttributes == null && "".equals(settings.get(CLUSTER_ROUTING_ALLOCATION_AWARENESS_ATTRIBUTES; null))) {
                awarenessAttributes = Strings.EMPTY_ARRAY; // the empty string resets this
            if (awarenessAttributes != null) {
                logger.info("updating [cluster.routing.allocation.awareness.attributes] from [{}] to [{}]"; AwarenessAllocationDecider.this.awarenessAttributes; awarenessAttributes);
                AwarenessAllocationDecider.this.awarenessAttributes = awarenessAttributes;
            Map forcedAwarenessAttributes = new HashMap(AwarenessAllocationDecider.this.forcedAwarenessAttributes);
            Map forceGroups = settings.getGroups(CLUSTER_ROUTING_ALLOCATION_AWARENESS_FORCE_GROUP);
            if (!forceGroups.isEmpty()) {


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