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From "Tsz Wo Nicholas Sze (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-7672) Erasure Coding: handle write failure for stripping coding blocks
Date Tue, 05 May 2015 22:17:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529400#comment-14529400
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Tsz Wo Nicholas Sze commented on HDFS-7672:
-------------------------------------------

2. I also found it when running unit tests.  Fixed it.
3. No, the current stream may become failed in the first if.

Structural:
1. I do have a separated JIRA HDFS-8288.  Do you want to commit it first?
2. This was from HDFS-7889.  We do not need to call super.locateFollowingBlock in the first
time since we already have the LocatedBlock.
3. I don't understand this question.  Which line in the code?
4 & 5. The keep-writing method works very well in replication in many years.  The variable-length
block method is new.  So we must support keep-writing method and may support the variable-length
block method as an option.
6 & 7. I plan to add more tests later.  Let me also think about how to make it faster
later.

Thanks a lot, Zhe.


> Erasure Coding: handle write failure for stripping coding blocks
> ----------------------------------------------------------------
>
>                 Key: HDFS-7672
>                 URL: https://issues.apache.org/jira/browse/HDFS-7672
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: Tsz Wo Nicholas Sze
>            Assignee: Tsz Wo Nicholas Sze
>         Attachments: h7672_20150504.patch, h7672_20150504b.patch, h7672_20150504c.patch,
h7672_20150505.patch
>
>
> In *stripping* case, for (6, 3)-Reed-Solomon, a client writes to 6 data blocks and 3
parity blocks concurrently.  We need to handle datanode or network failures when writing a
EC BlockGroup.



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