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Date: Mon, 28 Nov 2011 14:02:40 +0000 (UTC)
From: "Steve Loughran (Work started) (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Work started] (HDFS-2492) BlockManager cross-rack
 replication checks only work for ScriptBasedMapping
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     [ https://issues.apache.org/jira/browse/HDFS-2492?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Work on HDFS-2492 started by Steve Loughran.

> BlockManager cross-rack replication checks only work for ScriptBasedMapping
> ---------------------------------------------------------------------------
>
>                 Key: HDFS-2492
>                 URL: https://issues.apache.org/jira/browse/HDFS-2492
>             Project: Hadoop HDFS
>          Issue Type: Bug
>    Affects Versions: 0.23.0, 0.24.0
>            Reporter: Steve Loughran
>            Assignee: Steve Loughran
>            Priority: Blocker
>         Attachments: HDFS-2492-blockmanager.patch, HDFS-2492-blockmanager.patch
>
>
> The BlockManager cross-rack replication checks only works if script files are used for replication, not if alternate plugins provide the topology information.
> This is because the BlockManager sets its rack checking flag if there is a filename key
> {code}
> shouldCheckForEnoughRacks = conf.get(DFSConfigKeys.NET_TOPOLOGY_SCRIPT_FILE_NAME_KEY) != null;
> {code}
> yet this filename key is only used if the topology mapper defined by 
> {code}
> DFSConfigKeys.NET_TOPOLOGY_NODE_SWITCH_MAPPING_IMPL_KEY
> {code}
> is an instance of {{ScriptBasedMapping}}
> If any other mapper is used, the system may be multi rack, but the Block Manager will not be aware of this fact unless the filename key is set to something non-null

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