Brett Bergquist created DERBY-6955:
--------------------------------------
Summary: All database threads stuck and not making any progress
Key: DERBY-6955
URL: https://issues.apache.org/jira/browse/DERBY-6955
Project: Derby
Issue Type: Bug
Components: Store
Affects Versions: 10.10.2.0
Environment: Solaris 10
Very large database (about 750G) with about 100 tx/second insertion rate
Network Server
Reporter: Brett Bergquist
Attachments: stacktrace1, stacktrace2
A system in production got into a very strange state with none of the database
engine threads making any progress. Initially a connection could be made to
the network server, but any query would hang. The network server also hung on
shutdown.
The lack of progresss was observed by generating 6 stack traces, 10 seconds
apart. Each of these stack traces show the threads exactly as in the previous
stack trace. I will attach 2 of the stack traces which are 10 seconds apart.
About half of the threads were in a call chain the looks like:
{code:java}
"DRDAConnThread_161" #187 prio=5 os_prio=64 tid=0x0000000101f1c800 nid=0xd6
waiting on condition [0xfffffffcad0fe000]
java.lang.Thread.State: WAITING (parking)
at sun.misc.Unsafe.park(Native Method)
- parking to wait for <0xfffffffefa4524c8> (a
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject)
at java.util.concurrent.locks.LockSupport.park(LockSupport.java:175)
at
java.util.concurrent.locks.AbstractQueuedSynchronizer$ConditionObject.awaitUninterruptibly(AbstractQueuedSynchronizer.java:1976)
at
org.apache.derby.impl.services.cache.CacheEntry.waitUntilIdentityIsSet(Unknown
Source)
at
org.apache.derby.impl.services.cache.ConcurrentCache.getEntry(Unknown Source)
at org.apache.derby.impl.services.cache.ConcurrentCache.find(Unknown
Source)
at
org.apache.derby.impl.store.access.RAMAccessManager.conglomCacheFind(Unknown
Source)
at
org.apache.derby.impl.store.access.RAMTransaction.findConglomerate(Unknown
Source)
at
org.apache.derby.impl.store.access.RAMTransaction.findExistingConglomerate(Unknown
Source)
at
org.apache.derby.impl.store.access.RAMTransaction.openStoreCost(Unknown Source)
at
org.apache.derby.impl.sql.compile.CompilerContextImpl.getStoreCostController(Unknown
Source)
at
org.apache.derby.impl.sql.compile.FromBaseTable.getStoreCostController(Unknown
Source)
at org.apache.derby.impl.sql.compile.FromBaseTable.estimateCost(Unknown
Source)
at
org.apache.derby.impl.sql.compile.OptimizerImpl.estimateTotalCost(Unknown
Source)
at
org.apache.derby.impl.sql.compile.OptimizerImpl.costBasedCostOptimizable(Unknown
Source)
at
org.apache.derby.impl.sql.compile.OptimizerImpl.costOptimizable(Unknown Source)
at org.apache.derby.impl.sql.compile.FromBaseTable.optimizeIt(Unknown
Source)
at
org.apache.derby.impl.sql.compile.ProjectRestrictNode.optimizeIt(Unknown Source)
at
org.apache.derby.impl.sql.compile.OptimizerImpl.costPermutation(Unknown Source)
at org.apache.derby.impl.sql.compile.SelectNode.optimize(Unknown Source)
at
org.apache.derby.impl.sql.compile.DMLStatementNode.optimizeStatement(Unknown
Source)
at
org.apache.derby.impl.sql.compile.CursorNode.optimizeStatement(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepMinion(Unknown Source)
at org.apache.derby.impl.sql.GenericStatement.prepare(Unknown Source)
at
org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.prepareInternalStatement(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement20.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement30.<init>(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedPreparedStatement40.<init>(Unknown
Source)
at org.apache.derby.jdbc.Driver40.newEmbedPreparedStatement(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
- locked <0xffffffff12e07950> (a
org.apache.derby.impl.jdbc.EmbedConnection40)
at org.apache.derby.impl.jdbc.EmbedConnection.prepareStatement(Unknown
Source)
at org.apache.derby.impl.drda.DRDAStatement.prepare(Unknown Source)
at org.apache.derby.impl.drda.DRDAStatement.explicitPrepare(Unknown
Source)
at org.apache.derby.impl.drda.DRDAConnThread.parsePRPSQLSTT(Unknown
Source)
at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown
Source)
at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
{code}
and the majority of the others look like:
{code java}
"DRDAConnThread_118" #144 prio=5 os_prio=64 tid=0x0000000101072800 nid=0xab in
Object.wait() [0xfffffffd342fe000]
java.lang.Thread.State: WAITING (on object monitor)
at java.lang.Object.wait(Native Method)
at java.lang.Object.wait(Object.java:502)
at org.apache.derby.impl.store.raw.log.LogToFile.flush(Unknown Source)
- locked <0xfffffffd605393c0> (a
org.apache.derby.impl.store.raw.log.LogToFile)
at org.apache.derby.impl.store.raw.log.LogToFile.flush(Unknown Source)
at org.apache.derby.impl.store.raw.log.FileLogger.flush(Unknown Source)
at org.apache.derby.impl.store.raw.xact.Xact.prepareCommit(Unknown
Source)
at org.apache.derby.impl.store.raw.xact.Xact.xa_commit(Unknown Source)
at org.apache.derby.impl.store.access.RAMTransaction.xa_commit(Unknown
Source)
at
org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.doCommit(Unknown
Source)
at
org.apache.derby.impl.sql.conn.GenericLanguageConnectionContext.xaCommit(Unknown
Source)
at org.apache.derby.impl.jdbc.EmbedConnection.xa_commit(Unknown Source)
- locked <0xfffffffef72c71d8> (a
org.apache.derby.impl.jdbc.EmbedConnection40)
at org.apache.derby.jdbc.XATransactionState.xa_commit(Unknown Source)
- eliminated <0xfffffffefa7b2958> (a
org.apache.derby.jdbc.XATransactionState)
at org.apache.derby.jdbc.EmbedXAResource.commit(Unknown Source)
- locked <0xfffffffefa7b2958> (a
org.apache.derby.jdbc.XATransactionState)
- locked <0xffffffff5343b4c0> (a org.apache.derby.jdbc.EmbedXAResource)
at
org.apache.derby.impl.drda.DRDAXAProtocol.commitXATransaction(Unknown Source)
at org.apache.derby.impl.drda.DRDAXAProtocol.commitTransaction(Unknown
Source)
at org.apache.derby.impl.drda.DRDAXAProtocol.parseSYNCCTL(Unknown
Source)
at org.apache.derby.impl.drda.DRDAConnThread.processCommands(Unknown
Source)
at org.apache.derby.impl.drda.DRDAConnThread.run(Unknown Source)
{code}
An interesting thing with the second one is the lock on
- locked <0xfffffffd605393c0> (a org.apache.derby.impl.store.raw.log.LogToFile)
Multiple threads claim to have locked this object which I find concerning as
one would assume that only one thread could have a lock at a time. See the
attached stack trace and you will see that there are many threads that seem to
have locked this object and are in the same state.
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