Kihwal Lee created HDFS-4998:
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Summary: TestUnderReplicatedBlocks fails intermittently
Key: HDFS-4998
URL: https://issues.apache.org/jira/browse/HDFS-4998
Project: Hadoop HDFS
Issue Type: Bug
Components: test
Affects Versions: 2.1.0-beta
Reporter: Kihwal Lee
Looking at branch-2.1-beta jenkins build, this test case seems flaky.
First, addToInvalidates() is called against a block on a datanode. This removes
the dn from the BlockInfo in blocksMap.
At this point, raising the replication factor can cause the same node to be
picked. If the node has already deleted the block, it will work. If not, the
replication fails. When it fails, it will take at least the pending replication
timeout to reschedule, which is 5 minutes. But the test will timeout before
this and fail.
We could make it wait for the completion of actual block deletion. Or the test
timeout can be made a lot longer, but past jiras against this test case
indicate people want this to run faster.
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