hadoop-common-dev mailing list archives

Site index · List index
Message view « Date » · « Thread »
Top « Date » · « Thread »
From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HADOOP-2330) Preallocate transaction log to improve namenode transaction logging performance
Date Fri, 18 Jul 2008 22:15:31 GMT

     [ https://issues.apache.org/jira/browse/HADOOP-2330?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

dhruba borthakur updated HADOOP-2330:

    Attachment: preallocateTransactionLog2.patch

Thanks Ben. I am uploading a new patch that incorporates your change. Also, this patch shoudl
merge well with the current trunk.

> Preallocate transaction log to improve namenode transaction logging performance
> -------------------------------------------------------------------------------
>                 Key: HADOOP-2330
>                 URL: https://issues.apache.org/jira/browse/HADOOP-2330
>             Project: Hadoop Core
>          Issue Type: Improvement
>          Components: dfs
>            Reporter: dhruba borthakur
>            Assignee: dhruba borthakur
>         Attachments: preallocateTransactionLog.patch, preallocateTransactionLog.patch,
> In the current implementation, the transaction log is opened in "append" mode and every
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.

This message is automatically generated by JIRA.
You can reply to this email to add a comment to the issue online.

View raw message