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From "dhruba borthakur (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1580) Add interface for generic Write Ahead Logging mechanisms
Date Fri, 29 Apr 2011 05:30:03 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1580?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13026852#comment-13026852
] 

dhruba borthakur commented on HDFS-1580:
----------------------------------------

Nice document. can you pl describe the error situations in more detail:

1. what happens when the write to the outputstream throws an expcetion? can the client continue
to write new transactions to the stream?
2. what happens when the InputStream.read() encounters a partial transaction? 
3. from the InputStream, is it possible to know how many transactions are available (without
actually reading till the end of the stream)?


> 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, 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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