[HBASE-19138] Rare failure in TestLruBlockCache

• Type: Bug
• Status: Resolved
• Priority: Trivial
• Resolution: Fixed
• Fix Version/s: 1.4.0, 2.0.0
• Component/s: test
• Assignee: Andrew Kyle Purtell
• Reporter: Andrew Kyle Purtell
• Created: 31/Oct/17 18:27
• Updated: 01/Aug/18 06:23
• Resolved: 31/Oct/17 20:41

Description

[ERROR] testCacheEvictionThreadSafe(org.apache.hadoop.hbase.io.hfile.TestLruBlockCache) Time elapsed: 0.028 s <<< FAILURE!
java.lang.AssertionError: expected:<0> but was:<1>
at org.apache.hadoop.hbase.io.hfile.TestLruBlockCache.testCacheEvictionThreadSafe(TestLruBlockCache.java:86)

Fix for this I think is waiting for the block count to drop to zero after awaiting shutdown of the executor pool. There's a rare race here. Tests look good using a Waiter predicate so far, but I haven't finished all 100 iterations yet.