[HBASE-25595] TestLruBlockCache.testBackgroundEvictionThread is flaky

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Fix Version/s: 3.0.0-alpha-1, 2.2.7, 2.5.0, 2.3.5, 2.4.3
• Hadoop Flags: Reviewed
• Assignee: Xiaolin Ha
• Reporter: Xiaolin Ha
• Created: 22/Feb/21 12:29
• Updated: 15/Apr/21 22:07
• Resolved: 16/Mar/21 14:56

Description

As the test result in https://ci-hadoop.apache.org/job/HBase/job/HBase-PreCommit-GitHub-PR/job/PR-2700/2/testReport/org.apache.hadoop.hbase.io.hfile/TestLruBlockCache/precommit_checks___yetus_jdk11_hadoop3_checks___testBackgroundEvictionThread/

It fails because background EvictionThread used the weak reference of LRUBlockCache, when the cache object is cleared by garbage collector, NO block eviction will be triggered by LruBlockCache#runEviction(). 

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Issue Links

• links to: GitHub Pull Request #2974