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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4350) Make enabling of stale marking on read and write paths independent
Date Tue, 29 Jan 2013 19:53:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4350?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13565723#comment-13565723
] 

Matt Foley commented on HDFS-4350:
----------------------------------

I think this is a good change, although introducing a minor incompatibility.
1.2 will have other incompatible changes, so it should be okay to add this to the branch-1
line.
Please do not put it in the branch-1.1 line.  Thanks.
                
> Make enabling of stale marking on read and write paths independent
> ------------------------------------------------------------------
>
>                 Key: HDFS-4350
>                 URL: https://issues.apache.org/jira/browse/HDFS-4350
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 3.0.0
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>         Attachments: hdfs-4350-1.patch, hdfs-4350-2.patch, hdfs-4350-3.patch, hdfs-4350-4.patch,
hdfs-4350-5.patch, hdfs-4350-6.patch, hdfs-4350-7.patch, hdfs-4350-branch-1-1.patch, hdfs-4350-branch-1-2.patch,
hdfs-4350.txt
>
>
> Marking of datanodes as stale for the read and write path was introduced in HDFS-3703
and HDFS-3912 respectively. This is enabled using two new keys, {{DFS_NAMENODE_CHECK_STALE_DATANODE_KEY}}
and {{DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_WRITE_KEY}}. However, there currently exists a
dependency, since you cannot enable write marking without also enabling read marking, since
the first key enables both checking of staleness and read marking.
> I propose renaming the first key to {{DFS_NAMENODE_AVOID_STALE_DATANODE_FOR_READ_KEY}},
and make checking enabled if either of the keys are set. This will allow read and write marking
to be enabled independently.

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