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