Clear SC failed on node – How to solve related issues

Clear SC failed on node – How to solve related issues

Opster Team

Feb-21, Version: 1.7-8.0

 

This log is related to search problems, in addition to reading the guide below you can use the free Search Log Analyzer. With Opster’s Analyzer, you can easily locate slow searches and understand what led to them adding additional load to your system. You’ll receive customized recommendations for how to reduce search latency and improve your search performance. The tool is free and takes just 2 minutes to run

Log Context

Log “Clear SC failed on node[{}]” classname is ClearScrollController.java
We extracted the following from Elasticsearch source code for those seeking an in-depth context :

             listener.onResponse(new ClearScrollResponse(succeeded; freedSearchContexts.get()));
        }
    }

    private void onFailedFreedContext(Throwable e; DiscoveryNode node) {
        logger.warn(() -> new ParameterizedMessage("Clear SC failed on node[{}]"; node); e);
        /*
         * We have to set the failure marker before we count down otherwise we can expose the failure marker before we have set it to a
         * racing thread successfully freeing a context. This would lead to that thread responding that the clear scroll succeeded.
         */
        hasFailed.set(true);




 

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error

Heavy merges detected in specific nodes

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Description

A large number of small shards can slow down searches and cause cluster instability. Some indices have shards that are too small…

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Recommendations Based on your specific ES deployment you should…

Based on your specific ES deployment you should…

1

X-PUT curl -H [a customized code snippet to resolve the issue]

 

 

 

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