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From "GAO Rui (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10530) BlockManager reconstruction work scheduling should correctly adhere to EC block placement policy
Date Thu, 30 Jun 2016 08:33:10 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10530?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

GAO Rui updated HDFS-10530:
---------------------------
    Attachment: HDFS-10530.3.patch

Patch 3 attached to address unit test failures.
For {{TestBalancer#doTestBalancerWithStripedFile()}}, adjust rack counts to avoid conflict
between {{Balancer}} and {{BlockPlacementPolicyRackFaultTolerant}} in tests.
 
For {{TestBlockManager#testPlacementPolicySatisfied()}}, add {{conf.setLong(DFSConfigKeys.DFS_NAMENODE_REPLICATION_INTERVAL_KEY,
Integer.MAX_VALUE)}} to avoid block reconstruction work while testing placement policy satisfaction.


> BlockManager reconstruction work scheduling should correctly adhere to EC block placement
policy
> ------------------------------------------------------------------------------------------------
>
>                 Key: HDFS-10530
>                 URL: https://issues.apache.org/jira/browse/HDFS-10530
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: namenode
>            Reporter: GAO Rui
>            Assignee: GAO Rui
>         Attachments: HDFS-10530.1.patch, HDFS-10530.2.patch, HDFS-10530.3.patch
>
>
> This issue was found by [~tfukudom].
> Under RS-DEFAULT-6-3-64k EC policy, 
> 1. Create an EC file, the file was witten to all the 5 racks( 2 dns for each) of the
cluster.
> 2. Reconstruction work would be scheduled if the 6th rack is added. 
> 3. While adding the 7th rack or more racks will not trigger reconstruction work. 
> Based on default EC block placement policy defined in “BlockPlacementPolicyRackFaultTolerant.java”,
EC file should be able to be scheduled to distribute to 9 racks if possible.
> In *BlockManager#isPlacementPolicySatisfied(BlockInfo storedBlock)* , *numReplicas* of
striped blocks might should be *getRealTotalBlockNum()*, instead of *getRealDataBlockNum()*.



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