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From "Jean-Daniel Cryans (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HDFS-265) Revisit append
Date Fri, 06 Nov 2009 01:34:32 GMT

    [ https://issues.apache.org/jira/browse/HDFS-265?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12774174#action_12774174
] 

Jean-Daniel Cryans commented on HDFS-265:
-----------------------------------------

We have been trying this patch for some time now on sequence files in HBase for the write
ahead logs by syncing the writers output stream. I experimented by doing fast increments on
a single cell at a rate of 800-900 operations a second and then killing -9 both the DN and
RS after some time. I then waited for the master to recover the WAL and all edits (I log every
of them locally) were present. I tried it dozens of times, killing machines after machines,
and it works every time.

+1

> Revisit append
> --------------
>
>                 Key: HDFS-265
>                 URL: https://issues.apache.org/jira/browse/HDFS-265
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>    Affects Versions: Append Branch
>            Reporter: Hairong Kuang
>            Assignee: Hairong Kuang
>             Fix For: Append Branch
>
>         Attachments: a.sh, appendDesign.pdf, appendDesign.pdf, appendDesign1.pdf, appendDesign2.pdf,
AppendSpec.pdf, AppendTestPlan.html, AppendTestPlan.html, AppendTestPlan.html, AppendTestPlan.html,
AppendTestPlan.html, AppendTestPlan.html, AppendTestPlan.html, TestPlanAppend.html
>
>
> HADOOP-1700 and related issues have put a lot of efforts to provide the first implementation
of append. However, append is such a complex feature. It turns out that there are issues that
were initially seemed trivial but needs a careful design. This jira revisits append, aiming
for a design and implementation supporting a semantics that are acceptable to its users.

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