[jira] [Created] (FLINK-27841) RocksDB cache miss increase in 1.15

["Feifan Wang (Jira)" <ji...@apache.org>]

Feifan Wang created FLINK-27841:
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             Summary: RocksDB cache miss increase in 1.15
                 Key: FLINK-27841
                 URL: https://issues.apache.org/jira/browse/FLINK-27841
             Project: Flink
          Issue Type: Improvement
          Components: Runtime / State Backends
    Affects Versions: 1.15.0
            Reporter: Feifan Wang
         Attachments: image-2022-05-31-00-21-49-338.png, image-2022-05-31-00-22-45-123.png

I run same job with 1.12.2 and 1.15.0 , find that cpu busy much higher than 1.12. After careful comparison, I find higher cache miss in 1.15. But block cache size is same. Is this as expected ?

I know RocksDB version in 1.15 is 6.20.3 and 1.12 is 5.17.2, is this just caused by different versions of RocksDB ?

!image-2022-05-31-00-21-49-338.png|width=599,height=146!

!image-2022-05-31-00-22-45-123.png|width=594,height=175!

test information:

job type : regular join

parallelism : 160

TaskManager memory : 32G

num of TaskManager : 10



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