Log After allocating; node would have less than the required free bytes threshold ( bytes free); preventing allocation – How To Solve Related Issues

Log After allocating; node would have less than the required free bytes threshold ( bytes free); preventing allocation – How To Solve Related Issues

Updated: Feb-20

Elasticsearch Version: 1.7-8.0

Background

To resolve issues causing many log errors you can try our Elasticsearch Check-Up it analyses ES configuration to provide actionable recommendations (no installation required) 


To troubleshoot log “After allocating; node would have less than the required free bytes threshold ( bytes free); preventing allocation” it’s important to understand a few problems related to Elasticsearch concepts allocation, cluster, node, routing, threshold. See bellow important tips and explanations on these concepts

Log Context

Log”after allocating; node [{}] would have less than the required {} free bytes threshold ({} bytes free); preventing allocation” classname is DiskThresholdDecider.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

         // Secondly; check that allocating the shard to this node doesn't put it above the high watermark
        final long shardSize = getShardSize(shardRouting; allocation.clusterInfo());
        double freeSpaceAfterShard = freeDiskPercentageAfterShardAssigned(usage; shardSize);
        long freeBytesAfterShard = freeBytes - shardSize;
        if (freeBytesAfterShard 



Related issues to this log

We have gathered selected Q&A from the community and issues from Github, that can help fix related issues please review the following for further information :

1 Elasticsearch Disk Space Issues after Close

0.73 K 2

low disk watermark [??%] exceeded on

  54.99 K 55

 

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