Wei-Chiu Chuang created HADOOP-12532:
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Summary: Data race in IPC client Client.stop()
Key: HADOOP-12532
URL: https://issues.apache.org/jira/browse/HADOOP-12532
Project: Hadoop Common
Issue Type: Bug
Reporter: Wei-Chiu Chuang
Assignee: Wei-Chiu Chuang
I found a data race in ipc.Client.stop()
ipc.Client maintains a hash map of connection threads. When stop() is called,
it interrupts all connection threads; the threads are supposed to remove itself
from the hash map as part of the clean up work; and stop() periodically checks
to see if the hash map is empty and then returns.
The bug is, this checking operation is not synchronized, and the connection
thread actually removes itself from the hash map before terminating
connections.
This bug causes regression for HDFS-4925. In fact, the fix in HDFS-4925 may not
be correct, because it assumes when it returns from
QuorumJournalManager.close(), IPC client connection threads are terminated. But
the reality is the IPC code assumes connections are closed, not the thread
(which in any case is buggy as well).
This is also likely related to the bug reported in HDFS-4925
(TestQuorumJournalManager.testPurgeLogs intermittently Fails
assertNoThreadsMatching)
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