Chris Westin created DRILL-2756:
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Summary: Check for cancellation in pseudo-blocking operations
Key: DRILL-2756
URL: https://issues.apache.org/jira/browse/DRILL-2756
Project: Apache Drill
Issue Type: Bug
Components: Execution - Relational Operators
Affects Versions: 0.8.0
Reporter: Chris Westin
Assignee: Chris Westin
Fix For: 0.9.0
Certain operators, such as hash join, hash agg, and sort, consume all of their
input before producing any output. For these, once they start working on their
input, they don't check to see if the request has been cancelled. If another
fragment fails (causing the overall query to be cancelled), or if the user
requests a cancellation, these operators continue working because they never
check.
We need to add checks (e.g., ask FragmentContext.isCancelled() or something
like that) to these at periodic points. We don't want to check after every row,
but it should be checked every so often (mimicing other operations, which
generally get notified at batch boundaries).
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