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https://issues.apache.org/jira/browse/HADOOP-9504?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13642539#comment-13642539
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Liang Xie commented on HADOOP-9504:
-----------------------------------
[~jlowe], i have got your concern, yes, it's reasonable.
let's move metricsRateAttributeMod initialization into ctor, we could ensure
"metricsRateAttributeMod is always referring to a consistent map" in this way,
without obvious performance penalty.
> create metricsRateAttributeMod with ConcurrentHashMap to avoid hashmap
> concurrent race
> --------------------------------------------------------------------------------------
>
> Key: HADOOP-9504
> URL: https://issues.apache.org/jira/browse/HADOOP-9504
> Project: Hadoop Common
> Issue Type: Bug
> Components: metrics
> Affects Versions: 3.0.0, 2.0.3-alpha
> Reporter: Liang Xie
> Assignee: Liang Xie
> Priority: Critical
> Attachments: HADOOP-9504.txt, HADOOP-9504-v2.txt
>
>
> Please see HBASE-8416 for detail information.
> we need to take care of the synchronization for HashMap put(), otherwise it
> may lead to spin loop.
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