%s prewarming worker has been interrupted – How to solve this Elasticsearch error

Opster Team

Aug-23, Version: 8.3-8.7

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Briefly, this error occurs when the Elasticsearch prewarming process is interrupted. Prewarming is a process where Elasticsearch loads frequently accessed indices into memory to speed up search operations. Interruptions could be due to system issues, insufficient resources, or abrupt shutdowns. To resolve this, ensure your system has enough resources (CPU, memory, disk space) to handle the prewarming process. Also, check for any system instability or network issues that could be causing interruptions. Lastly, ensure a graceful shutdown of Elasticsearch to prevent such errors.

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This guide will help you check for common problems that cause the log ” %s prewarming worker has been interrupted ” to appear. To understand the issues related to this log, read the explanation below about the following Elasticsearch concepts: plugin.

Log Context

Log “%s prewarming worker has been interrupted” classname is SearchableSnapshotDirectory.java.
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

                return;
            }
            executor.execute(ActionRunnable.run(ActionListener.runAfter(next.v1(); () -> prewarmNext(executor; queue)); next.v2()));
        } catch (InterruptedException e) {
            Thread.currentThread().interrupt();
            logger.warn(() -> format("%s prewarming worker has been interrupted"; shardId); e);
        }
    }

    public static Directory create(
        RepositoriesService repositories;

 

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