Re: c3p0 ConnectionTester socket read stuck after SQLException

3 Jan 2013

      Hello Tapomay,

after looking at your code, I was wondering why you chose the double 
management of connections in your Main/JdbcMonetdbTestClient classes. 
C3P0 provides a way to define "connection customizers" 
(com.mchange.v2.c3p0.ComboPooledDataSource.setConnectionCustomizerClassName(String)), 
which you can use to disable autocommit on new connections. This should 
simplify your example considerably. Nevertheless, I will try to provoke 
the exceptions you have mentioned and see how the JDBC driver handles 
them together with C3P0.

Best,

Hannes

On 20/12/12 15:41, Tapomay Dey wrote:
...
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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