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https://issues.apache.org/jira/browse/HDFS-3805?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Jing Zhao updated HDFS-3805:
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Attachment: HDFS-3805.patch
handle the 0-null pair.
> A small improvement of SerialNumberManager$SerialNumberMap.get
> --------------------------------------------------------------
>
> Key: HDFS-3805
> URL: https://issues.apache.org/jira/browse/HDFS-3805
> Project: Hadoop HDFS
> Issue Type: Improvement
> Affects Versions: 3.0.0
> Reporter: Jing Zhao
> Assignee: Jing Zhao
> Priority: Trivial
> Fix For: 3.0.0
>
> Attachments: HDFS-3805.patch, HDFS-3805.patch
>
>
> Instead of use containsKey() + get() to get the value from the HashMap, we
> can do get() once and check if the result is null
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