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From "Li Bo (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-9373) Show friendly information to user when client succeeds the writing with some failed streamers
Date Thu, 17 Dec 2015 05:54:46 GMT

     [ https://issues.apache.org/jira/browse/HDFS-9373?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Li Bo updated HDFS-9373:
------------------------
    Attachment: HDFS-9373-003.patch

Sorry for the checkstyle error.Update patch 003 to fix it.

> Show friendly information to user when client succeeds the writing with some failed streamers
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-9373
>                 URL: https://issues.apache.org/jira/browse/HDFS-9373
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: erasure-coding
>    Affects Versions: 3.0.0
>            Reporter: Li Bo
>            Assignee: Li Bo
>         Attachments: HDFS-9373-001.patch, HDFS-9373-002.patch, HDFS-9373-003.patch
>
>
> When not more than PARITY_NUM streamers fail for a block group, the client may still
succeed to write the data. But several exceptions are thrown to user and user has to check
the reasons.  The friendly way is just inform user that some streamers fail when writing a
block group. It’s not necessary to show the details of exceptions because a small number
of stream failures is not vital to the client writing.
> When only DATA_NUM streamers succeed, the block group is in a high risk because the corrupt
of any block will cause all the six blocks' data lost. We should give obvious warning to user
when this occurs. 



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