Updating cluster routing allocation awareness attributes from to – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 2.3-2.3

Briefly, this error occurs when Elasticsearch is updating its cluster routing allocation awareness attributes. This feature is used to balance the shards across different attributes like rack id or availability zones. The error might be due to incorrect configuration or network issues. To resolve this, ensure that the awareness attributes are correctly configured in elasticsearch.yml file. Also, check the network connectivity between the nodes. If the issue persists, consider restarting the Elasticsearch cluster, but ensure that there is no ongoing indexing or search operations to prevent data loss.

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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