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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HDFS-1497) Write pipeline sequence numbers should be sequential with no skips or duplicates
Date Fri, 12 Nov 2010 19:47:13 GMT

     [ https://issues.apache.org/jira/browse/HDFS-1497?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Todd Lipcon updated HDFS-1497:
------------------------------

    Attachment: hdfs-1497.txt

Patch adds a check for sequential seqnos, and also a unit test that shows that we were failing
to maintain this property before with empty hflushes.

Running unit test suite now.

> Write pipeline sequence numbers should be sequential with no skips or duplicates
> --------------------------------------------------------------------------------
>
>                 Key: HDFS-1497
>                 URL: https://issues.apache.org/jira/browse/HDFS-1497
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: hdfs client
>    Affects Versions: 0.20-append, 0.22.0
>            Reporter: Todd Lipcon
>            Assignee: Todd Lipcon
>         Attachments: hdfs-1497.txt
>
>
> In HDFS-895 we discovered that multiple hflush() calls in a row without intervening writes
could cause a skip in sequence number. This doesn't seem to have any direct consequences,
but we should maintain and assert the invariant that sequence numbers have no gaps or duplicates.

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