Deadlock with SelectorManager.doProcess and TcpConnection.write
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Key: CASSANDRA-392
URL: https://issues.apache.org/jira/browse/CASSANDRA-392
Project: Cassandra
Issue Type: Bug
Components: Core
Affects Versions: 0.4
Reporter: Sammy Yu
Assignee: Sammy Yu
Fix For: 0.4
We ran into a deadlock last night:
Name: MESSAGE-SERIALIZER-POOL:2
State: BLOCKED on sun.nio.ch.selectionkeyi...@2e257f1b owned by: TCP Selector
Manager
Total blocked: 1 Total waited: 1
Stack trace:
org.apache.cassandra.net.SelectionKeyHandler.turnOnInterestOps(SelectionKeyHandler.java:73)
org.apache.cassandra.net.TcpConnection.write(TcpConnection.java:186)
- locked org.apache.cassandra.net.tcpconnect...@5ab9f791
org.apache.cassandra.net.MessageSerializationTask.run(MessageSerializationTask.java:67)
java.util.concurrent.ThreadPoolExecutor$Worker.runTask(ThreadPoolExecutor.java:886)
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:908)
java.lang.Thread.run(Thread.java:619)
Name: TCP Selector Manager
State: BLOCKED on org.apache.cassandra.net.tcpconnect...@5ab9f791 owned by:
MESSAGE-SERIALIZER-POOL:2
Total blocked: 2 Total waited: 0
Stack trace:
org.apache.cassandra.net.TcpConnection.connect(TcpConnection.java:360)
org.apache.cassandra.net.SelectorManager.doProcess(SelectorManager.java:131)
- locked sun.nio.ch.selectionkeyi...@2e257f1b
org.apache.cassandra.net.SelectorManager.run(SelectorManager.java:98)
The SelectionManager.doProcess acquires a monitor on the SelectionKey and then
calls methods such as TcpConnection.connect(SelectionKey key) which obtains a
monitor for the TcpConnection object itself. Another task eg:
MessageSerializationTask can come along and call write(Message message) which
obtains a monitor for the TCPConnection first and then on calls to
turnOnInterestOps tries to obtain the monitor for the SelectionKey which causes
the deadlock.
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