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From "Zhe Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-1068) Reduce NameNode GC by reusing HdfsFileStatus objects in RPC handlers
Date Fri, 01 Sep 2017 06:46:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

Zhe Zhang updated HDFS-1068:
    Status: Patch Available  (was: Open)

> Reduce NameNode GC by reusing HdfsFileStatus objects in RPC handlers
> --------------------------------------------------------------------
>                 Key: HDFS-1068
>                 URL: https://issues.apache.org/jira/browse/HDFS-1068
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: namenode
>            Reporter: Hairong Kuang
>            Assignee: Zhe Zhang
>         Attachments: HDFS-1068.00.patch, Screen Shot 2017-08-31 at 3.58.15 PM.png
> In our production clusters, getFileInfo is the most frequent operation that hit NameNode,
and its frequency is highly correlated to the GC behavior. HDFS-946 has already reduced the
amount of heap/cpu and the number of temporary objects for each getFileInfo call. Yet another
improvement is to avoid creation of a HdfsFileStatus object for each getFileInfo call. Instead
each RPC handler can have a thread local HdfsFileStatus object. Each getFileInfo call simply
sets values for all fields of the thread local HdfsFileStatus object. 

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