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From "Chris Douglas (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1087) Use StringBuilder instead of Formatter for audit logs
Date Thu, 08 Apr 2010 01:33:36 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1087?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Chris Douglas updated HDFS-1087:
--------------------------------

    Attachment: H1087-0.patch

In studying slowdowns in the MR scheduler, Amar Kamat found that {{Formatter}} is expensive,
particularly compared to appending to a {{StringBuilder}}. Since the namenode may emit an
entry to the audit log for every successful transaction, small improvements will help.

> Use StringBuilder instead of Formatter for audit logs
> -----------------------------------------------------
>
>                 Key: HDFS-1087
>                 URL: https://issues.apache.org/jira/browse/HDFS-1087
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: name-node
>            Reporter: Chris Douglas
>            Priority: Minor
>         Attachments: H1087-0.patch
>
>
> The audit logs do not use any {{format}} functionality that cannot be replaced by a simple,
more efficient set of appends.

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