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Posted to hdfs-issues@hadoop.apache.org by "Hairong Kuang (JIRA)" <ji...@apache.org> on 2010/03/25 20:04:27 UTC

[jira] Created: (HDFS-1068) Reduce get

Reduce get
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                 Key: HDFS-1068
                 URL: https://issues.apache.org/jira/browse/HDFS-1068
             Project: Hadoop HDFS
          Issue Type: Improvement
            Reporter: Hairong Kuang




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[jira] Updated: (HDFS-1068) Reduce getFileInfo's impact on GC by avoiding the creation of HdfsFileStatus for each RPC call

Posted by "Hairong Kuang (JIRA)" <ji...@apache.org>.
     [ https://issues.apache.org/jira/browse/HDFS-1068?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Hairong Kuang updated HDFS-1068:
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      Component/s: name-node
      Description: 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. 
    Fix Version/s: 0.22.0
         Assignee: Hairong Kuang
          Summary: Reduce getFileInfo's impact on GC by avoiding the creation of HdfsFileStatus for each RPC call  (was: Reduce get)

> Reduce getFileInfo's impact on GC by avoiding the creation of HdfsFileStatus for each RPC call
> ----------------------------------------------------------------------------------------------
>
>                 Key: HDFS-1068
>                 URL: https://issues.apache.org/jira/browse/HDFS-1068
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: 0.22.0
>
>
> 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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