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From "Yongjun Zhang (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-6133) Make Balancer support exclude specified path
Date Tue, 10 Feb 2015 15:54:12 GMT

    [ https://issues.apache.org/jira/browse/HDFS-6133?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14314368#comment-14314368

Yongjun Zhang commented on HDFS-6133:

Thanks [~zhaoyunjiong].

Are you saying {{NumFavouredNodes}} is equivalent to replication factor? I thought they are
different: the favoredNodes is specified when constructing DFSOutputStream, as a collection
of DNs. The write pipeline of a data block usually has three replicas, if any of the replicas
happens to be in the collection, and the data is pinned there.

I guess what you meant is that the normal use cases are, when we construct DFSOutputStream
for a file, we usually only pass replication number of DNs as favored DNs? Is there use scenario
that one want to specify larger number of favoredNodes?


> Make Balancer support exclude specified path
> --------------------------------------------
>                 Key: HDFS-6133
>                 URL: https://issues.apache.org/jira/browse/HDFS-6133
>             Project: Hadoop HDFS
>          Issue Type: Improvement
>          Components: balancer & mover, namenode
>            Reporter: zhaoyunjiong
>            Assignee: zhaoyunjiong
>         Attachments: HDFS-6133-1.patch, HDFS-6133-10.patch, HDFS-6133-2.patch, HDFS-6133-3.patch,
HDFS-6133-4.patch, HDFS-6133-5.patch, HDFS-6133-6.patch, HDFS-6133-7.patch, HDFS-6133-8.patch,
HDFS-6133-9.patch, HDFS-6133.patch
> Currently, run Balancer will destroying Regionserver's data locality.
> If getBlocks could exclude blocks belongs to files which have specific path prefix, like
"/hbase", then we can run Balancer without destroying Regionserver's data locality.

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