[teiid-issues] [JBoss JIRA] (TEIID-5801) Communications link failure during commit() error message when copying a MySQL table to a DB

So one thing that you can override if you want is to set the transactionSupport property on the mysql translator to NONE - but that may not be what you want generally.

If however you are dealing with an XA or local txn resource, they should still participate in the transaction if they are executed more than 1 statement or a non read-only statement. Unfortunately the code is making the check for serial execution for a single source command and so assumes the worst - it doesn't know the full processor plan at that point.

Communications link failure during commit() error message when copying a MySQL table to a DB -------------------------------------------------------------------------------------------- Key: TEIID-5801 URL: https://issues.jboss.org/browse/TEIID-5801 Project: Teiid Issue Type: Quality Risk Components: Query Engine Affects Versions: 12.0 Environment: teiid-12.0.0 on WildFly Full 14.0.1.Final (WildFly Core 6.0.2.Final) Reporter: Dmitrii Pogorelov Assignee: Steven Hawkins Priority: Major Attachments: server_1_fail.log, server_2_works.log, server_teiid.log When copying a MySQL table, for example, to PostgreSQL: {code:sql} insert into dwh_pg.test_target SELECT * FROM my.test_source ;; {code} in the end of the process Teiid throws out the following stacktrace (though rows are inserted in PostgreSQL successfully, seems that Teiid can't close read transaction for MySQL): {code} 2019-08-01 16:48:23,119 WARN [org.jboss.jca.core.connectionmanager.listener.TxConnectionListener] (Worker3_QueryProcessorQueue34) TidBkmeGWJN8 IJ000305: Connection error occured: org.jboss.jca.core.connectionmanager.listener.TxConnectionListener@75284e6d[state=NORMAL managed connection=org.jboss.jca.adapters.jdbc.local.LocalManagedConnection@5b8d92c7 connection handles=0 lastReturned=1564670796599 lastValidated=1564670796598 lastCheckedOut=1564670796678 trackByTx=true pool=org.jboss.jca.core.connectionmanager.pool.strategy.OnePool@ae21718 mcp=SemaphoreConcurrentLinkedQueueManagedConnectionPool@338041b4[pool=lingoda_read_replica] xaResource=LocalXAResourceImpl@1fcd6b81[connectionListener=75284e6d connectionManager=20f22ec1 warned=false currentXid=null productName=MySQL productVersion=5.6.34-log jndiName=java:/lingoda_read_replica] txSync=TransactionSynchronization@1367866468{tx=Local transaction (delegate=TransactionImple < ac, BasicAction: 0:ffffc0a8008c:33252ff9:5d42fad3:11 status: ActionStatus.PREPARING >, owner=Local transaction context for provider JBoss JTA transaction provider) wasTrackByTx=true enlisted=true cancel=false}]: com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Communications link failure during commit(). Transaction resolution unknown. at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method) at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62) at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) at java.lang.reflect.Constructor.newInstance(Constructor.java:423) at com.mysql.jdbc.Util.handleNewInstance(Util.java:411) at com.mysql.jdbc.Util.getInstance(Util.java:386) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:1014) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:988) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:974) at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:919) at com.mysql.jdbc.ConnectionImpl.commit(ConnectionImpl.java:1700) at org.jboss.jca.adapters.jdbc.local.LocalManagedConnection.commit(LocalManagedConnection.java:96) at org.jboss.jca.core.tx.jbossts.LocalXAResourceImpl.commit(LocalXAResourceImpl.java:172) at com.arjuna.ats.internal.jta.resources.arjunacore.XAOnePhaseResource.commit(XAOnePhaseResource.java:120) at com.arjuna.ats.internal.arjuna.abstractrecords.LastResourceRecord.topLevelPrepare(LastResourceRecord.java:152) at com.arjuna.ats.arjuna.coordinator.BasicAction.doPrepare(BasicAction.java:2664) at com.arjuna.ats.arjuna.coordinator.BasicAction.doPrepare(BasicAction.java:2614) at com.arjuna.ats.arjuna.coordinator.BasicAction.prepare(BasicAction.java:2157) at com.arjuna.ats.arjuna.coordinator.BasicAction.End(BasicAction.java:1503) at com.arjuna.ats.arjuna.coordinator.TwoPhaseCoordinator.end(TwoPhaseCoordinator.java:96) at com.arjuna.ats.arjuna.AtomicAction.commit(AtomicAction.java:162) at com.arjuna.ats.internal.jta.transaction.arjunacore.TransactionImple.commitAndDisassociate(TransactionImple.java:1288) at com.arjuna.ats.internal.jta.transaction.arjunacore.BaseTransaction.commit(BaseTransaction.java:126) at com.arjuna.ats.jbossatx.BaseTransactionManagerDelegate.commit(BaseTransactionManagerDelegate.java:89) at org.wildfly.transaction.client.LocalTransaction.commitAndDissociate(LocalTransaction.java:77) at org.wildfly.transaction.client.ContextTransactionManager.commit(ContextTransactionManager.java:71) at org.teiid.dqp.internal.process.TransactionServerImpl.commitDirect(TransactionServerImpl.java:384) at org.teiid.dqp.internal.process.TransactionServerImpl.commit(TransactionServerImpl.java:515) at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method) at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62) at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43) at java.lang.reflect.Method.invoke(Method.java:498) at org.teiid.logging.LogManager$LoggingProxy.invoke(LogManager.java:117) at com.sun.proxy.$Proxy25.commit(Unknown Source) at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:514) at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:362) at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:43) at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:285) at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:281) at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:113) at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:199) at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) at java.lang.Thread.run(Thread.java:745) {code} I tried to reproduce the problem with local MySQL and PostgreSQL but couldn't. The problem can be reproduced only when using remote MySQL and PostgreSQL. On my local machine the error appears with limit more than 200000 rows, on another machines the exception appeared when setting limit 400000 and more. It seems it's related maybe somehow with MySQL timeouts or network delays. If I copy the table from remote MySQL to local PostgeSQL the error doesn't appear, and vice versa, if I copy the table from local MySQL to remote PostgreSQL the error doesn't appear again. I don't have an access to the remote MySQL to have a look at its internal options. I also tried to set net_write_timeout=1800 jdbc property for data source of the remote MySQL, tcpKeepAlive=true, tried to set ThreadBound MySQL translator property to true value - it didn't help at all. What do you think, is it possible to avoid the error on Teiid level? I also attached a server log with org.teiid.CONNECTOR and org.teiid.PROCESSOR log outputs.