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From "Kai Zheng (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-8136) Client gets and uses EC schema when reads and writes a stripping file
Date Fri, 17 Apr 2015 01:08:59 GMT

    [ https://issues.apache.org/jira/browse/HDFS-8136?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14499086#comment-14499086
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Kai Zheng commented on HDFS-8136:
---------------------------------

bq.But there is not a test class about reader
Hi [~zhz], I remembered you mentioned we could have an end to end test from write to read.
With both read and write done I thought it's doable. Would we do it or need a task for it?
Thanks.
I thought it's good to have this for now. Ping [~libo-intel] for another review. 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-8136.1.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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