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Posted to issues-all@impala.apache.org by "Ye Zihao (Jira)" <ji...@apache.org> on 2021/10/18 06:31:00 UTC

[jira] [Created] (IMPALA-10971) Data cache metrics count error when LIRS is enabled

Ye Zihao created IMPALA-10971:
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             Summary: Data cache metrics count error when LIRS is enabled
                 Key: IMPALA-10971
                 URL: https://issues.apache.org/jira/browse/IMPALA-10971
             Project: IMPALA
          Issue Type: Bug
          Components: Backend
    Affects Versions: Impala 4.0.0
            Reporter: Ye Zihao
         Attachments: image-2021-10-18-14-15-52-422.png

When LIRS is enabled, impala-server.io-mgr.remote-data-cache-total-bytes may give a wrong value because of INSTANT EVICTIONS. When INSTANT EVICTIONS occur, the total bytes decreases due to EvictedEntry, and no corresponding increase due to failure of insert, so the total bytes becomes smaller and smaller, or even negative.

!image-2021-10-18-14-15-52-422.png!



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