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From "Jing Zhao (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-6961) BlockPlacementPolicy#chooseTarget should check each valid storage type in each choosing round
Date Thu, 28 Aug 2014 05:35:57 GMT

     [ https://issues.apache.org/jira/browse/HDFS-6961?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jing Zhao updated HDFS-6961:
----------------------------

    Attachment: HDFS-6961.000.patch

Initial patch. The patch also contains a unit test where the original mechanism fails to return
enough datanodes.

> BlockPlacementPolicy#chooseTarget should check each valid storage type in each choosing
round
> ---------------------------------------------------------------------------------------------
>
>                 Key: HDFS-6961
>                 URL: https://issues.apache.org/jira/browse/HDFS-6961
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: balancer, namenode
>            Reporter: Jing Zhao
>            Assignee: Jing Zhao
>         Attachments: HDFS-6961.000.patch
>
>
> Currently in each choosing round of BlockPlacementPolicy#chooseTarget (e.g., round 1
for choosing local storage, round 2 for remote rack, etc.), we only take into account the
first storage type in the storage type list. This may 
> fail to choose the local machine or sometimes may even fail to choose enough nodes.



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