Ivan Andika created HDDS-17380:
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Summary: Scanner shutdown can deadlock during volume failure
Key: HDDS-17380
URL: https://issues.apache.org/jira/browse/HDDS-17380
Project: Apache Ozone
Issue Type: Bug
Reporter: Ivan Andika
Assignee: Ivan Andika
*[P1] Scanner shutdown can deadlock during volume failure.*
AbstractBackgroundContainerScanner.java holds the scanner monitor while joining
its worker. Meanwhile, the worker calls a synchronized shutdown method when it
detects a failed volume:
{{Shutdown thread Scanner worker
Holds scanner monitor
Detects failed volume
Waits for worker via join()
Waits for scanner monitor}}
I reproduced this using the actual scanner classes: the shutdown thread was
{{WAITING}} in {{{}Thread.join(){}}}, and the worker was {{BLOCKED}} on its
monitor.
The remedy is to signal shutdown under synchronization, then release the
monitor before joining. {*}The subclass’s synchronized shutdown methods must
also be considered{*}; moving {{join()}} outside synchronization only in the
base class is insufficient.
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