Tim Armstrong created IMPALA-9611:
-------------------------------------
Summary: Hang in HandoffToProbesAndWait()
Key: IMPALA-9611
URL: https://issues.apache.org/jira/browse/IMPALA-9611
Project: IMPALA
Issue Type: Bug
Components: Backend
Affects Versions: Impala 3.4.0
Reporter: Tim Armstrong
Assignee: Tim Armstrong
I saw a hang triggered by test_failpoints in
JoinBuilder::HandofftoProbesAndWait(), where the thread was blocked but
build_side_state->is_cancelled_ is true.
The sequence of events leading to the bug is as follows:
* Thread A is in HandoffToProbesAndWait(), reads is_cancelled_ and sees false.
* Thread B in RuntimeState::Cancel() sets is_cancelled_ = true, acquires
cancellation_cvs_lock_, then calls NotifyAll() on the condition variable
* Thread A calls Wait() on the cv, blocks forever.
I think this is most likely if thread A is de-scheduled at the wrong time.
--
This message was sent by Atlassian Jira
(v8.3.4#803005)
