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https://issues.apache.org/jira/browse/HDFS-8120?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14495584#comment-14495584
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Li Bo commented on HDFS-8120:
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bq. the DFSStripedOutputStream should not allocate a new block in NameNode
When {{DFSStripedOutputStream}} requests a block group from NN, it also doesn't
know how many blocks in this block group will be empty. The client may just
wirte 1 byte, which makes most of the blocks in this block group empty. In
{{DFSOutputStream}}, if the write bytes of a block is 0,
{{DFSOutputStream#close()}} will not send an empty package to DN. The two
situations are a little different.
> Erasure coding: created util class to analyze striped block groups
> ------------------------------------------------------------------
>
> Key: HDFS-8120
> URL: https://issues.apache.org/jira/browse/HDFS-8120
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Reporter: Zhe Zhang
> Assignee: Zhe Zhang
> Attachments: HDFS-8120.000.patch, HDFS-8120.001.patch,
> HDFS-8120.002.patch, HDFS-8120.003.patch, HDFS-8120.004.patch
>
>
> The patch adds logic of calculating size of individual blocks in a striped
> block group.
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