4:23 a.m.
Hi,
I am using Jboss Pojo cache on top of Jboss cache (3.0.0GA) managing rather big object
trees of collections. And I am randomly getting com.sleepycat.je.DeadlockException(s) when
using the BdbjeCacheLoader as cache loader.
There are 10 threads running under a single machine (JSE environment), each does both
reading and writing. Neither reading nor writing (as I believe) should take up to 20
seconds as a transactional batch on my hardware, since the objects are not huge (each
object is a list of other object that include an array of maps of basic types).
If I set the lockAcquisitionTimeout to smaller value, it happens more frequently. But even
I set the value to a very big one, like 20000, it still happens with less frequency, and
it blocks for 20 seconds before this exception is thrown.
Due to these posts, I guess it might have something to do with mvcc. (I am using
je-3.3.82), but really do not hope so, since mvcc is one of the points I like jboss
cache.
http://forums.oracle.com/forums/thread.jspa?threadID=866063&tstart=60
http://forums.oracle.com/forums/thread.jspa?threadID=616358&tstart=30
Below is the jboss cache configuration and the exception stack trace. Thanks in advance
for your help!
| <?xml version="1.0" encoding="UTF-8"?>
| <jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xmlns="urn:jboss:jbosscache-core:config:3.0">
|
| <locking isolationLevel="READ_COMMITTED"
| lockParentForChildInsertRemove="false"
lockAcquisitionTimeout="5000"
| nodeLockingScheme="mvcc" writeSkewCheck="false"
concurrencyLevel="500" />
|
| <transaction
|
transactionManagerLookupClass="org.jboss.cache.transaction.GenericTransactionManagerLookup"
| syncRollbackPhase="false" syncCommitPhase="false" />
|
| <jmxStatistics enabled="false" />
|
| <startup regionsInactiveOnStartup="true" />
|
| <shutdown hookBehavior="DEFAULT" />
|
| <listeners asyncPoolSize="1" asyncQueueSize="100000" />
|
| <invocationBatching enabled="false" />
|
| <eviction wakeUpInterval="1000">
|
| <!-- Cache wide default -->
| <region name="/_default_"
algorithmClass="org.jboss.cache.eviction.LRUAlgorithm">
|
| <property name="maxNodes">10000</property>
| <property name="timeToLiveSeconds">300</property>
| </region>
| </eviction>
|
| <loaders passivation="false" shared="true">
| <preload>
| <node fqn="/" />
| </preload>
|
| <loader class="org.jboss.cache.loader.bdbje.BdbjeCacheLoader"
async="false"
| fetchPersistentState="false" ignoreModifications="false"
| purgeOnStartup="false">
|
| <properties>
|
| cache.jdbc.table.name=Cached_Events
| cache.jdbc.table.create=false
| cache.jdbc.table.drop=false
| cache.jdbc.table.primarykey=jbosscache_pk
| cache.jdbc.fqn.column=fqn
| cache.jdbc.fqn.type=varchar2(255)
| cache.jdbc.node.column=node
| cache.jdbc.node.type=blob
| cache.jdbc.parent.column=parent
|
| cache.jdbc.sql-concat=concat(1,2)
|
| cache.jdbc.connection.factory=org.jboss.cache.loader.C3p0ConnectionFactory
| c3p0.maxPoolSize=20
| c3p0.checkoutTimeout=5000
|
| location=tmp/jbosscache
| </properties>
|
| </loader>
|
|
| </loaders>
|
| </jbosscache>
|
| com.sleepycat.je.DeadlockException: (JE 3.3.82) Lock expired. Locker 6761395
-1_Detection2_ThreadLocker: waited for lock on database=JBossCache-Cluster
LockAddr:23471145 node=1785 type=READ grant=WAIT_NEW timeoutMillis=20000
startTime=1245426236094 endTime=1245426256097
| [junit] Owners: [<LockInfo locker="12706060 346_Detection1_Txn"
type="WRITE"/>]
| [junit] Waiters: [<LockInfo locker="24478649 347_Detection4_Txn"
type="WRITE"/>]
| [junit]
| [junit] at
com.sleepycat.je.txn.LockManager.makeTimeoutMsgInternal(LockManager.java:469)
| [junit] at
com.sleepycat.je.txn.SyncedLockManager.makeTimeoutMsg(SyncedLockManager.java:77)
| [junit] at com.sleepycat.je.txn.LockManager.lock(LockManager.java:278)
| [junit] at com.sleepycat.je.txn.BasicLocker.lockInternal(BasicLocker.java:167)
| [junit] at com.sleepycat.je.txn.Locker.lock(Locker.java:360)
| [junit] at
com.sleepycat.je.dbi.CursorImpl.lockLNDeletedAllowed(CursorImpl.java:2516)
| [junit] at com.sleepycat.je.dbi.CursorImpl.lockLN(CursorImpl.java:2438)
| [junit] at com.sleepycat.je.dbi.CursorImpl.fetchCurrent(CursorImpl.java:2368)
| [junit] at
com.sleepycat.je.dbi.CursorImpl.getCurrentAlreadyLatched(CursorImpl.java:1427)
| [junit] at
com.sleepycat.je.dbi.CursorImpl.getNextWithKeyChangeStatus(CursorImpl.java:1573)
| [junit] at com.sleepycat.je.dbi.CursorImpl.getNext(CursorImpl.java:1499)
| [junit] at com.sleepycat.je.dbi.CursorImpl.getNextNoDup(CursorImpl.java:1688)
| [junit] at com.sleepycat.je.Cursor.searchInternal(Cursor.java:1936)
| [junit] at com.sleepycat.je.Cursor.searchAllowPhantoms(Cursor.java:1748)
| [junit] at com.sleepycat.je.Cursor.search(Cursor.java:1615)
| [junit] at com.sleepycat.je.Cursor.getSearchKeyRange(Cursor.java:1117)
| [junit] at
org.jboss.cache.loader.bdbje.BdbjeCacheLoader.getChildrenNames(BdbjeCacheLoader.java:391)
| [junit] at
org.jboss.cache.loader.CacheLoaderManager.preload(CacheLoaderManager.java:371)
|
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