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From "Matt Foley (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-1562) Add rack policy tests
Date Fri, 22 Apr 2011 16:40:06 GMT

    [ https://issues.apache.org/jira/browse/HDFS-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13023271#comment-13023271
] 

Matt Foley commented on HDFS-1562:
----------------------------------

+1  Looks great!  Thanks, Eli.

> Add rack policy tests
> ---------------------
>
>                 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, hdfs-1562-2.patch, hdfs-1562-3.patch, hdfs-1562-4.patch,
hdfs-1562-5.patch
>
>
> The existing replication tests (TestBlocksWithNotEnoughRacks, TestPendingReplication,
TestOverReplicatedBlocks, TestReplicationPolicy, TestUnderReplicatedBlocks, and TestReplication)
are missing tests for rack policy violations.  This jira adds the following tests which I
created when generating 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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