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From "Tsz Wo (Nicholas), SZE (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-4177) Add a snapshot parameter to INodeDirectory.getChildrenList()
Date Wed, 14 Nov 2012 01:32:13 GMT

    [ https://issues.apache.org/jira/browse/HDFS-4177?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13496740#comment-13496740
] 

Tsz Wo (Nicholas), SZE commented on HDFS-4177:
----------------------------------------------

ImmutableList is an implementation of lists but what we need here is a lightweight interface
so that implements it without actually creating a list.  java.util.List is a good candidate
except that there are too many methods (>20).  We only need a lightweight interface with
a few methods.
                
> Add a snapshot parameter to INodeDirectory.getChildrenList()
> ------------------------------------------------------------
>
>                 Key: HDFS-4177
>                 URL: https://issues.apache.org/jira/browse/HDFS-4177
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: name-node
>            Reporter: Tsz Wo (Nicholas), SZE
>            Assignee: Tsz Wo (Nicholas), SZE
>             Fix For: Snapshot (HDFS-2802)
>
>         Attachments: h4177_20121112b.patch, h4177_20121112.patch
>
>
> With the snapshot features, the children list of directories can be different in snapshots
and the current view.  The snapshot information is required to select the children list.

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