kai33 opened a new pull request #1251: HBASE-23950. Backport HBASE-22480 to branch-2.1 URL: https://github.com/apache/hbase/pull/1251 Link to Jira: https://issues.apache.org/jira/browse/HBASE-23950 My HBase 2.0/2.1 cluster experienced severe performance drop after running reversed scans 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: ``` (every ~100 ms) Free started because "Full!" This block AAA is still referred by -1 readers. Can not be freed now This block BBB is still referred by -2 readers. Can not be freed now This block CCC is still referred by -3 readers. Can not be freed now ... This block ... is still referred by (negative number) readers. Can not be freed now ``` There have been patch 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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