[jira] [Updated] (HDFS-10530) BlockManager reconstruction work scheduling should correctly adhere to EC block placement policy

[GAO Rui (JIRA)]

     [ 
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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