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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-200) In HDFS, sync() not yet guarantees data available to the new readers
Date Sat, 15 May 2010 00:50:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-200?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12867766#action_12867766
] 

Todd Lipcon commented on HDFS-200:
----------------------------------

cool, I agree with your assessment. Unit test should be good whenever you have a chance, thanks!

> In HDFS, sync() not yet guarantees data available to the new readers
> --------------------------------------------------------------------
>
>                 Key: HDFS-200
>                 URL: https://issues.apache.org/jira/browse/HDFS-200
>             Project: Hadoop HDFS
>          Issue Type: New Feature
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: dhruba borthakur
>            Priority: Blocker
>         Attachments: 4379_20081010TC3.java, checkLeases-fix-1.txt, fsyncConcurrentReaders.txt,
fsyncConcurrentReaders11_20.txt, fsyncConcurrentReaders12_20.txt, fsyncConcurrentReaders13_20.txt,
fsyncConcurrentReaders14_20.txt, fsyncConcurrentReaders15_20.txt, fsyncConcurrentReaders16_20.txt,
fsyncConcurrentReaders3.patch, fsyncConcurrentReaders4.patch, fsyncConcurrentReaders5.txt,
fsyncConcurrentReaders6.patch, fsyncConcurrentReaders9.patch, hadoop-stack-namenode-aa0-000-12.u.powerset.com.log.gz,
hdfs-200-ryan-existing-file-fail.txt, hypertable-namenode.log.gz, namenode.log, namenode.log,
Reader.java, Reader.java, reopen_test.sh, ReopenProblem.java, Writer.java, Writer.java
>
>
> In the append design doc (https://issues.apache.org/jira/secure/attachment/12370562/Appends.doc),
it says
> * A reader is guaranteed to be able to read data that was 'flushed' before the reader
opened the file
> However, this feature is not yet implemented.  Note that the operation 'flushed' is now
called "sync".

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