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Date: Wed, 12 Aug 2009 23:50:14 -0700 (PDT)
From: "dhruba borthakur (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Subject: [jira] Updated: (HDFS-200) In HDFS, sync() not yet guarantees data
 available to the new readers
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     [ https://issues.apache.org/jira/browse/HDFS-200?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

dhruba borthakur updated HDFS-200:
----------------------------------

    Attachment: fsyncConcurrentReaders14_20.txt

This patch ignores deleting blocks during block report processing if the file is underConstruction. Updated test case to tets this corner case.

> 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, fsyncConcurrentReaders.txt, fsyncConcurrentReaders11_20.txt, fsyncConcurrentReaders12_20.txt, fsyncConcurrentReaders13_20.txt, fsyncConcurrentReaders14_20.txt, fsyncConcurrentReaders3.patch, fsyncConcurrentReaders4.patch, fsyncConcurrentReaders5.txt, fsyncConcurrentReaders6.patch, fsyncConcurrentReaders9.patch, hadoop-stack-namenode-aa0-000-12.u.powerset.com.log.gz, 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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