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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Created: (HADOOP-2330) Preallocate transaction log to improve namenode transaction logging performance
Date Sun, 02 Dec 2007 10:05:43 GMT
Preallocate transaction log to improve namenode transaction logging performance
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                 Key: HADOOP-2330
                 URL: https://issues.apache.org/jira/browse/HADOOP-2330
             Project: Hadoop
          Issue Type: Improvement
          Components: dfs
            Reporter: dhruba borthakur
            Assignee: dhruba borthakur


In the current implementation, the transaction is opened in "append" mode and evenry new transaction
is written to the end of the log. This means that new blocks get allocated to the edits file
frequently.

It is worth measuring the performance improvement when big chunks of the transaction log are
allocated up front. Adding new transactions do not cause frequent block allocations for the
edits log.


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