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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