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From "Brahma Reddy Battula (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-11361) Fix a race condition in MetricsSourceAdapter.updateJmxCache
Date Fri, 20 May 2016 10:47:12 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-11361?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15293157#comment-15293157

Brahma Reddy Battula commented on HADOOP-11361:

jmxCacheTS can be 0 only at the beginning. 
At that time, lastRecs also will be null only.
So it wont break anything

Morever, parameter 'all' is always passed as true.

bq.Could you explain why you think it's okay?
At the time when this issue was raised, that time 'lastRecsCleared' was not present. 
Now since that is present to track whether it was cleared or not, making 'lastRecs' null may
not be necessary.

> Fix a race condition in MetricsSourceAdapter.updateJmxCache
> -----------------------------------------------------------
>                 Key: HADOOP-11361
>                 URL: https://issues.apache.org/jira/browse/HADOOP-11361
>             Project: Hadoop Common
>          Issue Type: Bug
>    Affects Versions: 2.4.1, 2.5.1, 2.6.0
>            Reporter: Brahma Reddy Battula
>            Assignee: Brahma Reddy Battula
>         Attachments: HADOOP-111361-003.patch, HADOOP-11361-002.patch, HADOOP-11361-004.patch,
HADOOP-11361.patch, HDFS-7487.patch
> {noformat}
> Caused by: java.lang.NullPointerException
> 	at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateAttrCache(MetricsSourceAdapter.java:247)
> 	at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.updateJmxCache(MetricsSourceAdapter.java:177)
> 	at org.apache.hadoop.metrics2.impl.MetricsSourceAdapter.getAttribute(MetricsSourceAdapter.java:102)
> 	at com.sun.jmx.interceptor.DefaultMBeanServerInterceptor.getAttribute(DefaultMBeanServerInterceptor.java:647)
> {noformat}

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