How To Solve Issues Related to Log – Clear SC failed on node

How To Solve Issues Related to Log – Clear SC failed on node

Updated: Jan-20

Elasticsearch Version: 1.7-8.0

Background

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To troubleshoot log “Clear SC failed on node” it’s important to understand a few problems related to Elasticsearch concepts scroll, search. See bellow important tips and explanations on these concepts

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);




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 – remove a second elasticsearch node and add an other node, get unassigned shards

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Remove bad node from ElasticSearch cluster

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How to remove node from elasticsearch cluster on runtime without down time

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