[JBoss Cache: Core Edition] - BerkeleyDB Deadlock Exception from JBoss Cache Loader: Bdbje
by niuxuetao_fiserv
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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17 years
[JBoss Cache: Core Edition] - Dirty read even though configured as REPEATABLE_READ or READ
by vishwasoft
I'm trying to evaluate the JBossCache for our application
I'm getting dirty read even though I rollback transaction. I tried this with EJB3 Stateless session bean BMT.
Could you please anyone help me on this problem, Am I making anything wrong? please let me know if you need additional info
JBosscache : jbosscache-core-3.1.0.GA
JBoss As: jboss-5.0.0.GA
JDK: 1.5.0_07
Here is the code
| public class TestEntity {
|
| private int array[] = new int[100000];
|
| public void update(int value) {
|
| for (int i = 0; i < array.length; i++) {
| array [ i ]=value;
| }
|
| }
|
| public int[] getArray() {
| return array;
| }
| }
Stateless Bean1 code to modify cache
Stateless Bean 1
| public void updateArray(int value) {
| TransactionManager tm = cache.getConfiguration().getRuntimeConfig().getTransactionManager();
| try {
| tm.begin();
| String key = node.getFqn().toString();
| TestEntity t = (TestEntity) node.get(key);
| if(t != null) {
| t.update(value);
| node.put(key, t);
| }
| tm.rollback();
| } catch (Exception e) {
| try {
| tm.rollback();
| }catch(Exception ex1) {
| ex1.printStackTrace();
| }
| e.printStackTrace();
| }
| }
|
Stateless Bean 2 to read and validating array
| public boolean validateArray() {
| TransactionManager tm = cache.getConfiguration().getRuntimeConfig().getTransactionManager();
| try {
| tm.begin();
| int a[] = readArray();
| int value = a[0];
| for (int i = 0; i < a.length; i++) {
| if(a != value) {
| System.out.println(a+":"+value);
| sctx.getUserTransaction().rollback();
| return false;
| }
| }
| tm.commit();
| }catch(Exception ex) {
| try {
| tm.rollback();
| }catch(Exception ex1) {
| ex1.printStackTrace();
| }
| ex.printStackTrace();
| }
| return true;
| }
Configuration file:
I have used configuration file example for cache configuration
| <locking isolationLevel="REPEATABLE_READ"
| lockParentForChildInsertRemove="false" lockAcquisitionTimeout="50000"
| nodeLockingScheme="mvcc" writeSkewCheck="true" concurrencyLevel="500"
| useLockStriping="false" />
|
| <transaction transactionManagerLookupClass="org.jboss.cache.transaction.DummyTransactionManagerLookup"
| syncRollbackPhase="true" syncCommitPhase="true" />
|
| <?xml version="1.0" encoding="UTF-8"?>
|
| <jbosscache xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance"
| xmlns="urn:jboss:jbosscache-core:config:3.1">
| <locking isolationLevel="REPEATABLE_READ"
| lockParentForChildInsertRemove="false" lockAcquisitionTimeout="50000"
| nodeLockingScheme="mvcc" writeSkewCheck="true" concurrencyLevel="500"
| useLockStriping="false" />
|
| <transaction transactionManagerLookupClass="org.jboss.cache.transaction.DummyTransactionManagerLookup"
| syncRollbackPhase="true" syncCommitPhase="true" />
|
| <jmxStatistics enabled="true" />
|
| <shutdown hookBehavior="REGISTER" />
|
| <listeners asyncPoolSize="1" asyncQueueSize="1000000" />
|
| <serialization objectInputStreamPoolSize="50"
| objectOutputStreamPoolSize="50" version="3.0.0"
| marshallerClass="org.jboss.cache.marshall.VersionAwareMarshaller"
| useLazyDeserialization="false" useRegionBasedMarshalling="false" />
|
| <loaders passivation="true" shared="false">
| <preload>
| <node fqn="/" />
| </preload>
| <loader class="org.jboss.cache.loader.bdbje.BdbjeCacheLoader" async="false"
| fetchPersistentState="true" ignoreModifications="false"
| purgeOnStartup="false">
| <properties>location=c:/JavaTools/tmp</properties>
| </loader>
| </loaders>
| </jbosscache>
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17 years