Re: c3p0 ConnectionTester socket read stuck after SQLException

Verified that this issue persists even on the stable release installed from http://dev.monetdb.org/downloads/Fedora/ Occurs every-time we hit com.mchange.v2.c3p0.impl.NewPooledConnection.handleThrowable(NewPooledConnection.java:437) Regards, Tapomay. ________________________________ From: Tapomay Dey To: Communication channel for MonetDB users Sent: Thursday, December 20, 2012 8:11 PM Subject: Re: c3p0 ConnectionTester socket read stuck after SQLException As the source code has many unrelated dependencies I tried to extract the relevant code. Please find attached an eclipse project for the same. However I haven't been able to reproduce the issue in this test project. It should give you a fair idea of the sequence of calls made. Plz note that a single insert query used in the live project is much much larger (10K approx.) than the one in the test.  I reconfirmed that the issue is still there in the larger project. PS: I had sent this code long back and it got moderated just now(due to some 40KB limit). Thus I have removed the dependencies monetdb-jdbc-2.6.jar and c3p0-0.9.1.2.jar from lib. Plz add them to lib folder and everything should work(after u set the correct DB names in the code).(Anyways this code doesn't reproduce the issue I am facing so I guess just a manual overview should suffice) Regards, Tapomay. ________________________________ From: Hannes Mühleisen To: Communication channel for MonetDB users Sent: Thursday, December 20, 2012 2:17 PM Subject: Re: c3p0 ConnectionTester socket read stuck after SQLException Hello Tapomay, I will have a look later today, could you please also provide the source code that you have used to provoke the issue? Thanks, Hannes On 20/12/12 08:26, Tapomay Dey wrote:

Please find the thread dump below. Running MonetDB Database Server v1.6 (Oct2012-SP1). Compiled from MonetDB-11.13.5 src distribution. C3P0 version: 0.9.1.2. Also tried with 0.9.2. Occurs only after SQLException sometimes: INSERT INTO xyz : table xyz doesn't exist. Otherwise it works great. Also tried setting c3p0's preferredQuery for ConnectionTester to "select 1;". Problem persists.

Name: pool-15-thread-2 State: RUNNABLE Total blocked: 0  Total waited: 1

Stack trace: java.net.SocketInputStream.socketRead0(Native Method) java.net.SocketInputStream.read(SocketInputStream.java:150)

java.net.SocketInputStream.read(SocketInputStream.java:121)

java.io.BufferedInputStream.fill(BufferedInputStream.java:235) java.io.BufferedInputStream.read1(BufferedInputStream.java:275) java.io.BufferedInputStream.read(BufferedInputStream.java:334)     - locked java.io.BufferedInputStream@5cec5796 nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream._read(MapiSocket.java:846) nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.readBlock(MapiSocket.java:895) nl.cwi.monetdb.mcl.net.MapiSocket$BlockInputStream.read(MapiSocket.java:965) sun.nio.cs.StreamDecoder.readBytes(StreamDecoder.java:283) sun.nio.cs.StreamDecoder.implRead(StreamDecoder.java:325) sun.nio.cs.StreamDecoder.read(StreamDecoder.java:177)     - locked java.io.InputStreamReader@206a6883 java.io.InputStreamReader.read(InputStreamReader.java:184)

java.io.BufferedReader.fill(BufferedReader.java:154)

java.io.BufferedReader.readLine(BufferedReader.java:317)     - locked java.io.InputStreamReader@206a6883 java.io.BufferedReader.readLine(BufferedReader.java:382) nl.cwi.monetdb.mcl.io.BufferedMCLReader.readLine(BufferedMCLReader.java:119) nl.cwi.monetdb.mcl.io.BufferedMCLReader.waitForPrompt(BufferedMCLReader.java:196)     - locked nl.cwi.monetdb.mcl.io.BufferedMCLReader@29f38115 nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.executeQuery(MonetConnection.java:2296)     - locked nl.cwi.monetdb.mcl.net.MapiSocket@319f9f37 nl.cwi.monetdb.jdbc.MonetConnection$ResponseList.processQuery(MonetConnection.java:2274) nl.cwi.monetdb.jdbc.MonetStatement.internalExecute(MonetStatement.java:508) nl.cwi.monetdb.jdbc.MonetStatement.execute(MonetStatement.java:349)

nl.cwi.monetdb.jdbc.MonetStatement.executeQuery(MonetStatement.java:525)

com.mchange.v2.c3p0.impl.DefaultConnectionTester.activeCheckConnection(DefaultConnectionTester.java:73) com.mchange.v2.c3p0.impl.DefaultConnectionTester.statusOnException(DefaultConnectionTester.java:143) com.mchange.v2.c3p0.AbstractConnectionTester.statusOnException(AbstractConnectionTester.java:82) com.mchange.v2.c3p0.impl.NewPooledConnection.handleThrowable(NewPooledConnection.java:437)     - locked com.mchange.v2.c3p0.impl.NewPooledConnection@3340302c com.mchange.v2.c3p0.impl.NewProxyStatement.executeUpdate(NewProxyStatement.java:78) com.sokrati.moneta.mclient.JdbcMonetdbClient.executeUpdate(JdbcMonetdbClient.java:154) com.sokrati.moneta.multiplexer.MonetdbClientCallable.call(MonetdbClientCallable.java:46)

com.sokrati.moneta.multiplexer.MonetdbClientCallable.call(MonetdbClientCallable.java:1)

java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334) java.util.concurrent.FutureTask.run(FutureTask.java:166) java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1110) java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:603) java.lang.Thread.run(Thread.java:722)

Regards, Tapomay.

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