Dong Li created HAWQ-573:
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Summary: Resource leak when cancel copy
Key: HAWQ-573
URL: https://issues.apache.org/jira/browse/HAWQ-573
Project: Apache HAWQ
Issue Type: Bug
Components: Resource Manager
Reporter: Dong Li
Assignee: Lei Chang
Using select pg_cancel_backend() to cancel a "copy test5_pt2 (c1, c2, c3, c4,
c5, c6) FROM stdin;"
query make the resource leak.
You can see the log, when cancel the query, it didn't return resource to
resource manager.
p25926 is the QD process. The qd process didn't think it has acquired resource,
but the RM has allocated resource.
When qd is running in the function processAllCommFileDescs (called by
acquireResourceFromRM, which is a RPC to allocate resource from QD to RM), it
received a "query cancel pending'" interrupt, and it handles the interrupt and
error out.
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