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From "Nicolas Spiegelberg (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-142) In 0.20, move blocks being written into a blocksBeingWritten directory
Date Tue, 08 Jun 2010 23:56:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-142?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Nicolas Spiegelberg updated HDFS-142:
-------------------------------------

    Attachment: HDFS-142_20-append2.patch

Patch for 0.20-append branch.  Starts with HDFS-142_20.patch and includes all patches up to
appendFile-recheck-lease.txt.  Had trouble adding the relatively-new recover-rbw-v2.txt, so
left that for Todd.  Assumes that the 0.20-append patches in HDFS-826, HDFS-988, & HDFS-101
have been applied previously.

> In 0.20, move blocks being written into a blocksBeingWritten directory
> ----------------------------------------------------------------------
>
>                 Key: HDFS-142
>                 URL: https://issues.apache.org/jira/browse/HDFS-142
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.20-append
>            Reporter: Raghu Angadi
>            Assignee: dhruba borthakur
>            Priority: Blocker
>             Fix For: 0.20-append
>
>         Attachments: appendFile-recheck-lease.txt, appendQuestions.txt, deleteTmp.patch,
deleteTmp2.patch, deleteTmp5_20.txt, deleteTmp5_20.txt, deleteTmp_0.18.patch, dont-recover-rwr-when-rbw-available.txt,
handleTmp1.patch, hdfs-142-commitBlockSynchronization-unknown-datanode.txt, HDFS-142-deaddn-fix.patch,
HDFS-142-finalize-fix.txt, hdfs-142-minidfs-fix-from-409.txt, HDFS-142-multiple-blocks-datanode-exception.patch,
hdfs-142-recovery-reassignment-and-bbw-cleanup.txt, hdfs-142-testcases.txt, hdfs-142-testleaserecovery-fix.txt,
HDFS-142_20-append2.patch, HDFS-142_20.patch, recentInvalidateSets-assertion-fix.txt, recover-rbw-v2.txt,
testfileappend4-deaddn.txt, validateBlockMetaData-synchronized.txt
>
>
> Before 0.18, when Datanode restarts, it deletes files under data-dir/tmp  directory since
these files are not valid anymore. But in 0.18 it moves these files to normal directory incorrectly
making them valid blocks. One of the following would work :
> - remove the tmp files during upgrade, or
> - if the files under /tmp are in pre-18 format (i.e. no generation), delete them.
> Currently effect of this bug is that, these files end up failing block verification and
eventually get deleted. But cause incorrect over-replication at the namenode before that.
> Also it looks like our policy regd treating files under tmp needs to be defined better.
Right now there are probably one or two more bugs with it. Dhruba, please file them if you
rememeber.

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