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https://issues.apache.org/jira/browse/HDFS-8136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14507130#comment-14507130
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Kai Zheng commented on HDFS-8136:
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Thanks for the discussion. I agree with [~vinayrpet] that cellSize in
{{DFSStripedInputStream}} should also be final as it is in
{{DFSStripedOutputStream}}. If we have existing codes like {{setCellSize}}
please refactor and remove them. Thanks.
> Client gets and uses EC schema when reads and writes a stripping file
> ---------------------------------------------------------------------
>
> Key: HDFS-8136
> URL: https://issues.apache.org/jira/browse/HDFS-8136
> Project: Hadoop HDFS
> Issue Type: Sub-task
> Affects Versions: HDFS-7285
> Reporter: Kai Zheng
> Assignee: Kai Sasaki
> Attachments: HDFS-8136-005.patch, HDFS-8136.1.patch,
> HDFS-8136.2.patch, HDFS-8136.3.patch, HDFS-8136.4.patch, HDFS-8136.6.patch
>
>
> Discussed with [~umamaheswararao] and [~vinayrpet], in client when reading
> and writing a stripping file, it can invoke a separate call to NameNode to
> request the EC schema associated with the EC zone where the file is in. Then
> the schema can be used to guide the reading and writing. Currently it uses
> hard-coded values.
> Optionally, as an optimization consideration, client may cache schema info
> per file or per zone or per schema name. We could add schema name in
> {{HdfsFileStatus}} for that.
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