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https://issues.apache.org/jira/browse/HDFS-7672?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14529029#comment-14529029
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Tsz Wo Nicholas Sze commented on HDFS-7672:
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1. endBlock is from DataStreamer in trunk.  Let's use it.
2. Sure.
3. Do you mean closing the current block group and then continues writing to a 
new BlockGroup using the variable block length feature?  Writing with fewer 
health DNs is consistent with replication.  We should have it even we allow 
writing to a new BlockGroup as an option.

> 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
>
>
> 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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