[jira] Created: (HDFS-1562) Add rack policy tests

["Eli Collins (JIRA)" <ji...@apache.org>]

Add rack policy tests
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                 Key: HDFS-1562
                 URL: https://issues.apache.org/jira/browse/HDFS-1562
             Project: Hadoop HDFS
          Issue Type: Test
          Components: name-node, test
    Affects Versions: 0.23.0
            Reporter: Eli Collins
            Assignee: Eli Collins
         Attachments: hdfs-1562-1.patch

The existing replication tests (TestPendingReplication, TestOverReplicatedBlocks, TestReplicationPolicy, TestUnderReplicatedBlocks, TestReplication) are missing tests for rack policy violations.  This jira adds the following tests which I created generate a new patch for HDFS-15: 

* Test that blocks that have a sufficient number of total replicas, but are not replicated cross rack, get replicated cross rack when a rack becomes available.
* Test that new blocks for an underreplicated file will get replicated cross rack. 
* Mark a block as corrupt, test that when it is re-replicated that it is still replicated across racks.
* Reduce the replication factor of a file, making sure that the only block that is across racks is not removed when deleting replicas.
* Test that when a block is replicated because a replica is lost due to host failure the the rack policy is preserved.
* Test that when the execss replicas of a block are reduced due to a node re-joining the cluster the rack policy is not violated.
* Test that rack policy is still respected when blocks are replicated due to node decommissioning.
* Test that rack policy is still respected when blocks are replicated due to node decommissioning, even when the blocks are over-replicated.

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