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Date: Fri, 22 Apr 2011 04:09:05 +0000 (UTC)
From: "Todd Lipcon (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
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Subject: [jira] [Commented] (HDFS-1562) Add rack policy tests
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    [ https://issues.apache.org/jira/browse/HDFS-1562?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13023103#comment-13023103 ] 

Todd Lipcon commented on HDFS-1562:
-----------------------------------

+1, looks good to me. Will let Matt take another swing through before commit.

> 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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