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https://issues.apache.org/jira/browse/HADOOP-11786?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15268718#comment-15268718
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Andras Bokor commented on HADOOP-11786:
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[~airbots] Could you please review my patch? Thanks in advance.
> Fix Javadoc typos in org.apache.hadoop.fs.FileSystem
> ----------------------------------------------------
>
> Key: HADOOP-11786
> URL: https://issues.apache.org/jira/browse/HADOOP-11786
> Project: Hadoop Common
> Issue Type: Bug
> Components: documentation
> Affects Versions: 2.6.0
> Reporter: Chen He
> Assignee: Andras Bokor
> Priority: Trivial
> Labels: newbie++
> Attachments: HADOOP-11786.patch
>
>
> /**
> * Resets all statistics to 0.
> *
> * In order to reset, we add up all the thread-local statistics data, and
> * set rootData to the negative of that.
> *
> * This may seem like a counterintuitive way to reset the statsitics. Why
> * can't we just zero out all the thread-local data? Well, thread-local
> * data can only be modified by the thread that owns it. If we tried to
> * modify the thread-local data from this thread, our modification might
> get
> * interleaved with a read-modify-write operation done by the thread that
> * owns the data. That would result in our update getting lost.
> *
> * The approach used here avoids this problem because it only ever reads
> * (not writes) the thread-local data. Both reads and writes to rootData
> * are done under the lock, so we're free to modify rootData from any
> thread
> * that holds the lock.
> */
> etc.
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