Waiting until metadata writes are unblocked – How to solve this Elasticsearch exception

Opster Team

August-23, Version: 7.11-8.9

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Briefly, this error occurs when Elasticsearch is unable to write metadata due to a blockage, often caused by a full disk or a read-only index. To resolve this issue, you can free up disk space or increase the disk capacity. If the index is read-only, you can update the index settings to allow writes. Additionally, check for any ongoing operations that might be blocking metadata writes and resolve them.

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This guide will help you check for common problems that cause the log ” waiting until metadata writes are unblocked ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin, metadata.

Log Context

Log “waiting until metadata writes are unblocked” class name is LocalExporter.java. We extracted the following from Elasticsearch source code for those seeking an in-depth context :

 ClusterState clusterState = clusterService.state();
 if (clusterState.nodes().isLocalNodeElectedMaster()) {
 // we are on the elected master
 // Check that there is nothing that could block metadata updates
 if (clusterState.blocks().hasGlobalBlockWithLevel(ClusterBlockLevel.METADATA_WRITE)) {
 throw new ElasticsearchException("waiting until metadata writes are unblocked");
 }  // We haven't blocked off other resource installation from happening. That must be done first.
 assert migrationCoordinator.canInstall() == false : "migration attempted while resources could be erroneously installed";


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