[teiid-issues] [JBoss JIRA] (TEIID-2525) Prefetch exception with small fetch size
Steven Hawkins (JIRA)
jira-events at lists.jboss.org
Mon Jun 3 10:03:58 EDT 2013
[ https://issues.jboss.org/browse/TEIID-2525?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Steven Hawkins resolved TEIID-2525.
-----------------------------------
Labels: 8.4CR2 (was: )
Fix Version/s: 8.4
Resolution: Done
The issue occurs when the fetch size is a smaller non-divisor of the batch size in prefetch scenarios - as the prefetched batch is inappropriately being ignored leading to effectively duplicate fetches, which are not allowed under forward-only.
Corrected the client logic to not ignore the prefetch batch and also updated the server to send a better partial batch in forward-only.
> Prefetch exception with small fetch size
> ----------------------------------------
>
> Key: TEIID-2525
> URL: https://issues.jboss.org/browse/TEIID-2525
> Project: Teiid
> Issue Type: Bug
> Affects Versions: 8.4, 7.7.7
> Reporter: Filip Nguyen
> Assignee: Steven Hawkins
> Priority: Critical
> Labels: 8.4CR2
> Fix For: 8.4
>
>
> Doesn't work both in the newest Teiid and the 7.x version.
> Not sure how critical this is. When setting the prefetch via JDBC and using FORWARD_ONLY result set [1] I am getting exceptions [2]. I run the query on oracle (select * from XYZ limit 11).
> {code:java}
> TeiidDataSource ds = new TeiidDataSource();
> ds.setDatabaseName(vdb);
> ds.setUser("user");
> ds.setPassword("user");
> ds.setServerName(host);
> ds.setPortNumber(Integer.valueOf(port));
> ds.setFetchSize(10);
> ....
> Statement statement = connection.createStatement(ResultSet.TYPE_FORWARD_ONLY, ResultSet.CONCUR_READ_ONLY);
> {code}
> [2]
> {code:java}
> Eorg.teiid.jdbc.TeiidSQLException: ASSERTION FAILED: expected reference to be not null
> at org.teiid.jdbc.TeiidSQLException.create(TeiidSQLException.java:113)
> at org.teiid.jdbc.TeiidSQLException.create(TeiidSQLException.java:70)
> at org.teiid.jdbc.ResultSetImpl.processBatch(ResultSetImpl.java:402)
> at org.teiid.jdbc.ResultSetImpl.requestBatch(ResultSetImpl.java:375)
> at org.teiid.jdbc.BatchResults.requestBatchAndWait(BatchResults.java:226)
> at org.teiid.jdbc.BatchResults.requestNextBatch(BatchResults.java:141)
> at org.teiid.jdbc.BatchResults.hasNext(BatchResults.java:252)
> at org.teiid.jdbc.ResultSetImpl.hasNext(ResultSetImpl.java:439)
> at org.teiid.jdbc.ResultSetImpl.next(ResultSetImpl.java:251)
> at JDBCClient.execute(JDBCClient.java:90)
> at JDBCClient.main(JDBCClient.java:45)
> Caused by: org.teiid.core.TeiidException: ASSERTION FAILED: expected reference to be not null
> at org.teiid.client.ResultsMessage.setException(ResultsMessage.java:202)
> at org.teiid.dqp.internal.process.RequestWorkItem.sendError(RequestWorkItem.java:955)
> at org.teiid.dqp.internal.process.RequestWorkItem.close(RequestWorkItem.java:543)
> at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:346)
> at org.teiid.dqp.internal.process.AbstractWorkItem.run(AbstractWorkItem.java:51)
> at org.teiid.dqp.internal.process.RequestWorkItem.run(RequestWorkItem.java:248)
> at org.teiid.dqp.internal.process.DQPWorkContext.runInContext(DQPWorkContext.java:269)
> at org.teiid.dqp.internal.process.ThreadReuseExecutor$RunnableWrapper.run(ThreadReuseExecutor.java:119)
> at org.teiid.dqp.internal.process.ThreadReuseExecutor$3.run(ThreadReuseExecutor.java:214)
> at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110)
> at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603)
> at java.lang.Thread.run(Thread.java:722)
> Caused by: java.lang.AssertionError: ASSERTION FAILED: expected reference to be not null
> at org.teiid.core.util.Assertion.failed(Assertion.java:73)
> at org.teiid.core.util.Assertion.isNotNull(Assertion.java:100)
> at org.teiid.core.util.Assertion.isNotNull(Assertion.java:92)
> at org.teiid.common.buffer.TupleBuffer.getBatch(TupleBuffer.java:305)
> at org.teiid.dqp.internal.process.RequestWorkItem.sendResultsIfNeeded(RequestWorkItem.java:782)
> at org.teiid.dqp.internal.process.RequestWorkItem.processMore(RequestWorkItem.java:462)
> at org.teiid.dqp.internal.process.RequestWorkItem.process(RequestWorkItem.java:320)
> {code}
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