[HDFS-1562] Add rack policy tests

• Type: Test
• Status: Closed
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 0.22.0
• Fix Version/s: 0.22.0
• Component/s: namenode, test
• Hadoop Flags: Reviewed
• Assignee: Eli Collins
• Reporter: Eli Collins
• Created: 30/Dec/10 01:45
• Updated: 12/Dec/11 06:19
• Resolved: 22/Apr/11 17:11

Description

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.

Issue Links

• is related to: MAPREDUCE-2448 NoSuchMethodError: org.apache.hadoop.hdfs.TestDatanodeBlockScanner.corruptReplica(..)
• relates to: HDFS-1828 TestBlocksWithNotEnoughRacks intermittently fails assert
• relates to: HDFS-15 Rack replication policy can be violated for over replicated blocks