You are viewing a plain text version of this content. The canonical link for it is here.

Posted to issues@impala.apache.org by "Joe McDonnell (Jira)" <ji...@apache.org> on 2020/02/27 00:48:00 UTC

[jira] [Created] (IMPALA-9435) Usability enhancements for the data cache access trace

Joe McDonnell created IMPALA-9435:
-------------------------------------

             Summary: Usability enhancements for the data cache access trace
                 Key: IMPALA-9435
                 URL: https://issues.apache.org/jira/browse/IMPALA-9435
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
    Affects Versions: Impala 3.4.0
            Reporter: Joe McDonnell
            Assignee: Joe McDonnell


In IMPALA-8542, we added an access trace to the data cache. This outputs a JSON entry with information about each hit/miss. Currently it is controlled by the data_cache_enable_tracing startup parameter, and it will trace all accesses to a single file. There are a few enhancements that would make this easier to enable:
 # Limit the number of access trace entries stored on disk to avoid unlimited disk usage. This can be done by switching to use be/src/util/simple-logger.h rather than a single file. The number of retained entries should be configurable.
 # Implement a way to trace a subset of accesses (e.g. 5%)
 # Optionally provide a way to start/stop logging without restart (e.g. via the WebUI)



--
This message was sent by Atlassian Jira
(v8.3.4#803005)