[jira] [Created] (IMPALA-7819) Scanners should include "storage wait time" per scan node

["Tim Armstrong (JIRA)" <ji...@apache.org>]

Tim Armstrong created IMPALA-7819:
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             Summary: Scanners should include "storage wait time" per scan node
                 Key: IMPALA-7819
                 URL: https://issues.apache.org/jira/browse/IMPALA-7819
             Project: IMPALA
          Issue Type: Improvement
          Components: Backend
            Reporter: Tim Armstrong
            Assignee: Tim Armstrong


We have TotalStorageWaitTime per fragment instance, which aggregates various things like times spent waiting for the I/O manager and time spent in the Kudu client. This is useful but often we want to understand why a specific scan is slow. This is tricky because TotalStorageWaitTime and the various scanner thread timers in the profile are in different subsections and don't measure comparable things if there are multiple scans in the profile.

We should also include this timings in the scan profile to address this.



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