I am trying to understand what the "Count" column means in a WebSphere FFDC exception log. IBM told us we have received this error 6835 times. I have not found a good guide which explains what this count shows but from what I have seen it seems to be the number of times that this exception happened since the last JVM restart. The problem is that does not match up with our logs as this error only appears to be thrown 1 time per day with our daily restarts which I can see in the Systemout.log. Also this count doesn't seem to change over a weeks time in the exception logs. Can anyone help?
Index Count Time of last Occurrence Exception SourceId ProbeId
------+------+---------------------------+--------------------------
21 6835 11/19/11 7:00:17:631 UTC java.util.zip.ZipException com.ibm.ws.classloader.ClassLoaderUtils.addDependents 238
This website may be helpful: http://wasdynacache.blogspot.com/2011_07_01_archive.html (Section entitled "First Failure Data Capture for your enterprise application with WebSphere Application Server")
FFDC is capturing the state of the application server and/or the
application when an unexpected error or exception occurs the first
time. All subsequent iterations of the same error/exception are
ignored.
I tried seeing if I could find information for you specifically about count, but all FFDC logs can be formatted differently depending on which application calls it and which formatter the call uses. Good luck.
Related
Does anybody have an idea where to look for the cause of the following exception:
org.springframework.jdbc.CannotGetJdbcConnectionException: Could not get JDBC Connection; nested exception is org.apache.tomcat.jdbc.pool.PoolExhaustedException: [SimpleAsyncTaskExecutor-240] Timeout: Pool empty. Unable to fetch a connection in 30 seconds, none available[size:100; busy:0; idle:0; lastwait:30000].
What I find really strange is that it says that no connections are available while none are busy.
Everywhere that I look, the same error occurs but the number of busy connections is at least greater than 0.
I don't know whether this matters, but Tomcat version is 8.5.20.
Any idea are welcome!
A JBoss 5.2 application server log was filled with thousands of the following exception:
Caused by: javax.resource.ResourceException: Unable to get managed connection for jdbc_TestDB
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:441)
at org.jboss.resource.connectionmanager.TxConnectionManager.getManagedConnection(TxConnectionManager.java:424)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.allocateConnection(BaseConnectionManager2.java:496)
at org.jboss.resource.connectionmanager.BaseConnectionManager2$ConnectionManagerProxy.allocateConnection(BaseConnectionManager2.java:941)
at org.jboss.resource.adapter.jdbc.WrapperDataSource.getConnection(WrapperDataSource.java:96)
... 9 more
Caused by: javax.resource.ResourceException: No ManagedConnections available within configured blocking timeout ( 30000 [ms] )
at org.jboss.resource.connectionmanager.InternalManagedConnectionPool.getConnection(InternalManagedConnectionPool.java:311)
at org.jboss.resource.connectionmanager.JBossManagedConnectionPool$BasePool.getConnection(JBossManagedConnectionPool.java:689)
at org.jboss.resource.connectionmanager.BaseConnectionManager2.getManagedConnection(BaseConnectionManager2.java:404)
... 13 more
I've stripped off the first part of the exception, which is basically our internal JDBC wrapper code which tries to get a DB connection from the pool.
Looking at the Oracle DB side I ran the query:
select resource_name, current_utilization, max_utilization, limit_value
from v$resource_limit
where resource_name in ('sessions', 'processes');
This produced the output:
RESOURCE_NAME CURRENT_UTILIZATION MAX_UTILIZATION LIMIT_VALUE
processes 1387 1500 1500
sessions 1434 1586 2272
Given the fact that that PROCESSES limit of 1500 was reached, would this cause the JBoss exceptions we experienced? I've also been investigating the possibility of connection leaks, but haven't found any evidence of that so far.
What is the recommended course of action here? Is simply increasing the limit a valid solution?
Usually when max_utilization gets the processes value listener will refuse new connections to database. you can see the errors relates to it in alert log. to solve this in database side you should increase the processes parameter.
hmm strange. is it possible, that exception wrapping in JBOSS hides the original error? You should get some sql exception whose text starts with ORA-. Maybe your JDBC wrapper does not handle errors properly.
The recommended actions is to:
check configured size of connection pool against processes sessions Oracle startup paramters.
check Oracles view v$session, especially columns STATUS, LAST_CALL_ET, SQL_ID, PREV_SQL_ID.
translate sql_id(prev_sql_id) into sql_text via v$sql.
if you application has a connection leak, sql_id and pred_sql_id might point you onto a place in your source code, where a connection was used last (i.e. where it was leaked).
I was indexing around 70,000 records. Normally it takes around 1 to 2 minutes to bulk index. But this time it took more than 10 minutes and an exception was thrown from C# Nest Client.
Does anybody experience the below. Also to note that I set Index Refresh Interval as 30s.
ElasticSearch C# Nest Client. Below are the exception details:
Elasticsearch.Net.Exceptions.MaxRetryException occurred
HResult=-2146233088
Message=Unable to perform request: 'POST #indexName/_bulk' on any
of the nodes after retrying 0 times.
Source=Elasticsearch.Net
StackTrace:
at Elasticsearch.Net.Connection.Transport.RetryRequestAsync[T]
(TransportRequestState`1 requestState, Uri baseUri, Int32 retried,
Exception e) in
c:\Projects\NEST\src\Elasticsearch.Net\Connection\Transport.cs:line 344
InnerException:
I am not sure if this can help you, but I had similar issue in 2 node cluster. I've was adding synonyms and setup the file for only master machine. I completely forgot to copy it over to 2nd node. This was causing the error above for me when creating new index that depended on that synonym file. Which totally makes sense.
After I added synonym file and restarted 2nd node, everything went back to normal.
I am using hibernate 3 along with spring.My Hibernate configurations are as under :
hibernate.dialect=org.hibernate.dialect.Oracle8iDialect
hibernate.connection.release_mode=on_close
But after starting application, even if only one user accesses it then also I am getting this exception :
ORA-00020: maximum number of processes (550) exceeded
This is stacktrace:
Caused by: java.sql.SQLException: ORA-00020: maximum number of processes (550) exceeded
at oracle.jdbc.driver.DatabaseError.throwSqlException(DatabaseError.java:112)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:331)
at oracle.jdbc.driver.T4CTTIoer.processError(T4CTTIoer.java:288)
at oracle.jdbc.driver.T4C8Oall.receive(T4C8Oall.java:743)
at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:216)
at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:799)
at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1038)
at oracle.jdbc.driver.T4CPreparedStatement.executeMaybeDescribe(T4CPreparedStatement.java:839)
at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1133)
at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3285)
at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3329)
at com.mchange.v2.c3p0.impl.NewProxyPreparedStatement.executeQuery(NewProxyPreparedStatement.java:76)
at org.hibernate.jdbc.AbstractBatcher.getResultSet(AbstractBatcher.java:208)
at org.hibernate.loader.Loader.getResultSet(Loader.java:1953)
at org.hibernate.loader.Loader.doQuery(Loader.java:802)
at org.hibernate.loader.Loader.doQueryAndInitializeNonLazyCollections(Loader.java:274)
at org.hibernate.loader.Loader.loadEntity(Loader.java:2037)
I have kept connection pool time out = 5000. I have also tried to found the cause and got that release mode may affect the mechanism of closing DB resources. But I couldn't find exact solution for that.
Please help..
Thanks in advance..
This is a database error not an application error so you need to go to the database to solve it. 550 processes is a lot more than it sounds so either someone has gone insane or you have a lot of inactive processes running.
The best way to find out is to query the v$session view or Gv$session if you're using a RAC, look at the STATUS column.
Take careful not of where all these sessions are coming from; the OSUSER, TERMINAL and PROGRAM will probably be the most useful. It might almost be worth creating a temporary table with this information - proof and a record afterwards. Then after checking that you're not going to break anything, and with your DBAs if you have any, kill all the inactive sessions simultaneously or one at a time.
That'll remove the error but if it's occurred once it can occur again, so you need to solve it. Either:
You've got a lot of people using the database.
There is an application / program somewhere that is not closing it's
sessions after it's finished.
Someone is connecting in the middle of a loop.
Whichever reason it is you need to track it down and correct it. I'd start with the program or terminal from v$session that had the most number of processes.
I have an application containing 4 MDB's each of which receives SOAP messages over JMS from MQ. Once the messages have been received we process the XML into an object model and process accordingly which always involves either loading or saving messages to an Oracle database via Hibernate.
Additionally we have a quartz process with fires every minute that may or may not trigger so actions which could also read or write to the database using Hibernate.
When the system in under high load, i.e. processing large numbers 1k + and potentially performing some database read/writes triggered by our quartz process we keep seeing the following exception be thrown in our logs.
===============================================================================
at com.integrasp.iatrade.logic.MessageContextRouting.lookup(MessageContextRouting. java:150)
at com.integrasp.iatrade.logic.RequestResponseManager.findRequestDestination(Reque stResponseManager.java:153) at com.integrasp.iatrade.logic.RequestResponseManager.findRequestDestination(Reque stResponseManager.java:174)
at com.integrasp.iatrade.logic.IOLogic.processResponse(IOLogic.java:411)< br /> at com.integrasp.iatrade.logic.FxOrderQuoteManager.requestQuote(FxOrderQuoteManage r.java:119)
at com.integrasp.iatrade.logic.FxOrderQuoteManager.processRequest(FxOrderQuoteMana ger.java:682)
at com.integrasp.iatrade.logic.FxOrderSubmissionManager.processRequest(FxOrderSubm issionManager.java:408)
at com.integrasp.iatrade.eo.SubmitOrderRequest.process(SubmitOrderRequest.java:60)
at com.integrasp.iatrade.ejb.BusinessLogicRegister.perform(BusinessLogicRegister.j ava:85)
at com.integrasp.iatrade.ejb.mdb.OrderSubmissionBean.onMessage(OrderSubmissionBean .java:147)
at com.ibm.ejs.jms.listener.MDBWrapper$PriviledgedOnMessage.run(MDBWrapper.java:30 2)
at com.ibm.ws.security.util.AccessController.doPrivileged(AccessController.java:63 )
at com.ibm.ejs.jms.listener.MDBWrapper.callOnMessage(MDBWrapper.java:271)
at com.ibm.ejs.jms.listener.MDBWrapper.onMessage(MDBWrapper.java:240)
at com.ibm.mq.jms.MQSession.run(MQSession.java:1593)
at com.ibm.ejs.jms.JMSSessionHandle.run(JMSSessionHandle.java:970)
at com.ibm.ejs.jms.listener.ServerSession.connectionConsumerOnMessage(ServerSessio n.java:891)
at com.ibm.ejs.jms.listener.ServerSession.onMessage(ServerSession.java:656)
at com.ibm.ejs.jms.listener.ServerSession.dispatch(ServerSession.java:623)
at sun.reflect.GeneratedMethodAccessor79.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:43)
at java.lang.reflect.Method.invoke(Method.java:615)
at com.ibm.ejs.jms.listener.ServerSessionDispatcher.dispatch(ServerSessionDispatch er.java:37)
at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:96)
at com.ibm.ejs.container.MDBWrapper.onMessage(MDBWrapper.java:132)
at com.ibm.ejs.jms.listener.ServerSession.run(ServerSession.java:481)
at com.ibm.ws.util.ThreadPool$Worker.run(ThreadPool.java:1473)
Caused by: java.lang.reflect.InvocationTargetException
at sun.reflect.GeneratedMethodAccessor42.invoke(Unknown Source)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.ja va:43)
at java.lang.reflect.Method.invoke(Method.java:615)
at org.hibernate.transaction.WebSphereExtendedJTATransactionLookup$TransactionMana gerAdapter$TransactionAdapter.registerSynchronization(WebSphereExtendedJTATransa ctionLookup.java:225)
... 30 more
Caused by: com.ibm.websphere.jtaextensions.NotSupportedException
at com.ibm.ws.jtaextensions.ExtendedJTATransactionImpl.registerSynchronizationCall backForCurrentTran(ExtendedJTATransactionImpl.java:247)
... 34 more
Could any body help to shed come light on what com.ibm.websphere.jtaextensions.NotSupportedException means. The IBM documentation says
"The exception is thrown by the transaction manager if an attempt is made to register a SynchronizationCallback in an environment or at a time when this function is not available. "
Which to me sounds like the container is rejecting hibernates call to start a transaction. If anybody has any idea on why the container could be throwing the message please let me know.
Thanks in advance
Karl
If you really need high load I would remove the Hibernate layer between your app and the database. Without Hibernate you have less moving parts and more control.
That is the only advice I can give you.
If anyone was interested it was a thread that was trying to sync the transaction when the transaction had timed out.
I had assumed that if the transaction timeout then the thread would have been killed however this was not the case.
karl