Chen He created HADOOP-11786:
--------------------------------
Summary: 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: Yanjun Wang
Priority: Trivial
/**
* 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.
--
This message was sent by Atlassian JIRA
(v6.3.4#6332)
