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https://issues.apache.org/jira/browse/YARN-7200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17216025#comment-17216025
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Agshin Kazimli commented on YARN-7200:
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I've added a patch involving two changes in 
org.apache.hadoop.yarn.sls.scheduler.SchedulerMatrics and 
org.apache.hadoop.yarn.sls.SLSRunner classes. I've added static function 
closeMetricsWriter() which uses metricsLogBW to write a closing bracket and 
closes the metricsLogBW. In SLSRunner, the function is called just before the 
application exits.

> SLS generates a realtimetrack.json file but that file is missing the closing 
> ']'
> --------------------------------------------------------------------------------
>
>                 Key: YARN-7200
>                 URL: https://issues.apache.org/jira/browse/YARN-7200
>             Project: Hadoop YARN
>          Issue Type: Bug
>          Components: scheduler-load-simulator
>            Reporter: Grant Sohn
>            Assignee: Agshin Kazimli
>            Priority: Minor
>              Labels: newbie, newbie++
>         Attachments: YARN-7200-branch-trunk.patch, realtimetrack.json
>
>
> File 
> hadoop-tools/hadoop-sls/src/main/java/org/apache/hadoop/yarn/sls/scheduler/SchedulerMetrics.java
>  shows:
> {noformat}
>   void tearDown() throws Exception {
>     if (metricsLogBW != null)  {
>       metricsLogBW.write("]");
>       metricsLogBW.close();
>     }
>     ....
> {noformat}
> So the exit logic is flawed.



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