Re: thread hang on execute call - Mailing list pgsql-jdbc

i am using dbcp apache connection pooling.
i don't think it would allocate same connection to two thread until it
is released by the other thread.

by seeing stack trance of postgres and java process
it seems both are waiting for input....i couldn't understand how it
could be possible.

On Tue, 2006-04-04 at 11:14 -0400, Dave Cramer wrote:
> Pavan,
>
> You cannot share connections across threads without locking. Is it
> possible that you are doing this ?
>
> Dave
> On 4-Apr-06, at 5:04 AM, Pavan Kumar wrote:
>
> > Hi
> > i have some worker threads that perform some database intensive
> > operation after each fixed interval.so they keeps running.
> >  after 2 days all threads got hang on execute call on jdbc driver.
> > there are around 60000 rows in table.
> > i get no response and following is
> >
> >
> > here is stack trace of postgres process
> >
> > #0  0x003437a2 in _dl_sysinfo_int80 () from /lib/ld-linux.so.2
> > #1  0x00424451 in recv () from /lib/tls/libc.so.6
> > #2  0x08145aae in secure_read ()
> > #3  0x0814c062 in pq_recvbuf ()
> > #4  0x0814c121 in pq_getbyte ()
> > #5  0x081ad5fc in PostgresMain ()
> > #6  0x0818765d in ServerLoop ()
> > #7  0x0818904f in PostmasterMain ()
> > #8  0x0814dd18 in main ()
> >
> >
> > and following is stack trace of java thread
> >
> >
> > Thread 12912: (state = IN_NATIVE)
> >  - java.net.SocketInputStream.socketRead0(java.io.FileDescriptor,
> > byte[], int, int, int) @bci=0 (Compiled frame; information may be
> > imprecise)
> >  - java.net.SocketInputStream.read(byte[], int, int) @bci=84, line=129
> > (Compiled frame)
> >  - java.io.BufferedInputStream.fill() @bci=175, line=218 (Compiled
> > frame)
> >  - java.io.BufferedInputStream.read() @bci=12, line=235 (Compiled
> > frame)
> >  - org.postgresql.core.PGStream.ReceiveChar() @bci=4, line=254
> > (Compiled
> > frame)
> >  -
> > org.postgresql.core.v3.QueryExecutorImpl.execute
> > (org.postgresql.core.Query, org.postgresql.core.ParameterList,
> > org.postgresql.core.ResultHandler, int, int, int) @bci=129,
> > line=188 (Interpreted frame)
> >  -
> > org.postgresql.jdbc2.AbstractJdbc2Statement.execute
> > (org.postgresql.core.Query, org.postgresql.core.ParameterList, int)
> > @bci=199, line=430 (Interpreted frame)
> >  - org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(int)
> > @bci=14, line=346 (Compiled frame)
> >  - org.postgresql.jdbc2.AbstractJdbc2Statement.execute() @bci=2,
> > line=339 (Interpreted frame)
> >  - org.apache.commons.dbcp.DelegatingPreparedStatement.execute()
> > @bci=8,
> > line=168 (Interpreted frame)
> >
> >
> >
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