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https://issues.apache.org/jira/browse/SPARK-7598?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14541659#comment-14541659
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Apache Spark commented on SPARK-7598:
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User 'twilightgod' has created a pull request for this issue:
https://github.com/apache/spark/pull/6117
> Add aliveWorkers metrics in Master
> ----------------------------------
>
> Key: SPARK-7598
> URL: https://issues.apache.org/jira/browse/SPARK-7598
> Project: Spark
> Issue Type: Improvement
> Components: Deploy
> Affects Versions: 1.3.1
> Reporter: Rex Xiong
> Priority: Minor
>
> In Spark Standalone setup, when some workers are DEAD, they will stay in
> master worker list for a while.
> master.workers metrics for master is only showing the total number of
> workers, we need to monitor how many real ALIVE workers are there to ensure
> the cluster is healthy.
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