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From "Sanjay Radia (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1580) Add interface for generic Write Ahead Logging mechanisms
Date Thu, 26 May 2011 02:06:47 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13039478#comment-13039478
] 

Sanjay Radia commented on HDFS-1580:
------------------------------------

Please add some text doc to motivate the 
Journal#getNumberOfTransactions(long 
sinceTxnId)
.
>From what I understand this method gives the # of transactions since tX in a particular
storage dir. 
Would it be better instead to ask getHighestTxid()?




> Add interface for generic Write Ahead Logging mechanisms
> --------------------------------------------------------
>
>                 Key: HDFS-1580
>                 URL: https://issues.apache.org/jira/browse/HDFS-1580
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>            Reporter: Ivan Kelly
>             Fix For: Edit log branch (HDFS-1073)
>
>         Attachments: EditlogInterface.1.pdf, EditlogInterface.2.pdf, HDFS-1580+1521.diff,
HDFS-1580.diff, HDFS-1580.diff, HDFS-1580.diff, generic_wal_iface.pdf, generic_wal_iface.pdf,
generic_wal_iface.pdf, generic_wal_iface.txt
>
>


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