IBM Support

Lock contention in JDBC connection pool when under high load

Troubleshooting


Problem

Attempts to utilize IBM Rational Team Concert under a high user load resultes in lock contention in the JDBC connection pool.

Symptom

The lock contention in the JDBC Connection pool may render as the inability to connect to the database from the Web UI or evident in the log files, or performance issues from a users perspective.

In the javacore log, many threads are showing up blocked at the following location:
at sun/misc/Unsafe.park(Native Method)
at java/util/concurrent/locks/LockSupport.park(LockSupport.java:182(Compiled Code))
at java/util/concurrent/locks/AbstractQueuedSynchronizer.parkAndCheckInterrupt(AbstractQueuedSynchronizer.java:822(Compiled Code))
at java/util/concurrent/locks/AbstractQueuedSynchronizer.acquireQueued(AbstractQueuedSynchronizer.java:853(Compiled Code))
at java/util/concurrent/locks/AbstractQueuedSynchronizer.acquire(AbstractQueuedSynchronizer.java:1189(Compiled Code))
at java/util/concurrent/locks/ReentrantLock$FairSync.lock(ReentrantLock.java:212(Compiled Code))
at java/util/concurrent/locks/ReentrantLock.lock(ReentrantLock.java:273(Compiled Code))
at java/util/concurrent/ArrayBlockingQueue.offer(ArrayBlockingQueue.java:233(Compiled Code))
at com/ibm/team/repository/service/internal/rdb/AbstractPool.releaseEntry(AbstractPool.java:150(Compiled Code))
at com/ibm/team/repository/service/internal/rdb/JDBCConnectionPool.releaseConnection(JDBCConnectionPool.java:220(Compiled Code))

[{"Product":{"code":"SSUC3U","label":"IBM Engineering Workflow Management"},"Business Unit":{"code":"BU048","label":"IBM Software"},"Component":"Repository","Platform":[{"code":"PF016","label":"Linux"}],"Version":"4.0.2","Edition":"Standard","Line of Business":{"code":"LOB77","label":"Automation Platform"}}]

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Document Information

Modified date:
16 June 2018

UID

swg21646478

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