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Posted to dev@ranger.apache.org by "Todd Lipcon (JIRA)" <ji...@apache.org> on 2019/05/09 06:04:00 UTC

[jira] [Created] (RANGER-2420) Ranger spends 36% of CPU in ObjectMapper

Todd Lipcon created RANGER-2420:
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             Summary: Ranger spends 36% of CPU in ObjectMapper
                 Key: RANGER-2420
                 URL: https://issues.apache.org/jira/browse/RANGER-2420
             Project: Ranger
          Issue Type: Improvement
          Components: Ranger
            Reporter: Todd Lipcon


Ranger uses ObjectMapper to convert to/from JSON. In a profile of a workload (an Impala authorization test) I see that 36% of the ranger CPU is spent in these functions. 26% of total CPU is in the '_findRootDeserializer' method, which gets cached if a type is deserialized multiple times. However, the caching is only effective if the ObjectMapper is reused. JSONUtil appears to create a new ObjectMapper on every call, which defeats the caching.



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