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https://issues.apache.org/jira/browse/HDFS-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Zhe Zhang updated HDFS-1068:
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Summary: Reduce NameNode GC by reusing HdfsFileStatus objects in RPC
handlers (was: Reduce getFileInfo's impact on GC by avoiding the creation of
HdfsFileStatus for each RPC call)
> 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: Hairong Kuang
>
> 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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