[jira] [Created] (HBASE-23950) Backport HBASE-22480 to branch-2.1

["Kai Xie (Jira)" <ji...@apache.org>]

Kai Xie created HBASE-23950:
-------------------------------

             Summary: Backport HBASE-22480 to branch-2.1
                 Key: HBASE-23950
                 URL: https://issues.apache.org/jira/browse/HBASE-23950
             Project: HBase
          Issue Type: Bug
          Components: BucketCache
    Affects Versions: 2.1.9
            Reporter: Kai Xie


My HBase 2.0/2.1 cluster experienced severe performance drop after running reversed scanning for days. When debug into regionserver logs, it appears the bucket cache is full for every ~100 ms and its eviction can't work properly because ref count has become negative:

 

 
{code:java}
(every ~100 ms)
Free started because "Full!"
This block AAA is still referred by -1 readers. Cannot be freed now
This block BBB is still referred by -2 readers. Cannot be freed now
This block CCC is still referred by -3 readers. Cannot be freed now
...
This block ... is still referred by (negative number) readers. Cannot be freed now
{code}
There have been patches HBASE-22480 addressing this ref count problem in 2.2+. I'd like to backport it to 2.1 (understand that 2.0 is EOL)

 



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