Re: Tomcat Hangs with variable frequency
On 22/12/2010 11:48, Rhonny David wrote: Hi ALL, We are using tomcat 6.0 in production environment Exactly which version? Also exact versions for JDK and OS please. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Hangs with variable frequency
I think i have already provided these except tomcat. Anyways we are using Tomcat 6.0.29, which is pointed to jre 1.5.0_10. And the OS is Microsoft Windows Server 2003, R2 , Standard Edition, Service Pack2. Regards, David From: Mark Thomas ma...@apache.org To: Tomcat Users List users@tomcat.apache.org Sent: Wed, December 22, 2010 4:52:52 PM Subject: Re: Tomcat Hangs with variable frequency On 22/12/2010 11:48, Rhonny David wrote: Hi ALL, We are using tomcat 6.0 in production environment Exactly which version? Also exact versions for JDK and OS please. Mark - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Hangs with variable frequency
net.sourceforge.jtds.jdbc.JtdsResultSet.close ( JtdsResultSet.java:486 )
I think it is an issue with implementation of JtdsResultSet.close(), [1]
0485:if (!getConnection().isClosed()) {
0486:// Skip to end of result set
0487:// Could send cancel but this is safer as
0488:// cancel could kill other statements
in a batch.
0489:while (next())
0490:;
0491:}
[1]
http://www.java2s.com/Open-Source/Java-Document/Database-JDBC-Connection-Pool/jTDS/net/sourceforge/jtds/jdbc/JtdsResultSet.java.htm
[2]
http://jtds.svn.sourceforge.net/viewvc/jtds/branches/jTDS%201.2%20%28stable%29/src/main/net/sourceforge/jtds/jdbc/JtdsResultSet.java?revision=1107view=markup#l467
It tries to dispose the resultset by reading through it and hangs in
the process (or maybe the resultset is too big and reading it takes a
while).
Best regards,
Konstantin Kolinko
-
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Re: Tomcat Hangs with variable frequency
I won't support your reasoning, because the same JTDS driver version we are
using for our other site and there the number of concurrent users of the
application is more than 800 and therefore the volume of concurrent requests is
very high, but we never faced the issue of this nature. Secondly, we have
recently started using JTD driver and tomcat jndi connection pooling for our
current site and earlier we used microsoft driver and our own connection
pooling
mechaninsm, but the same issue of tomcat hanging was occurring at that time.
Regards,
David
From: Konstantin Kolinko knst.koli...@gmail.com
To: Tomcat Users List users@tomcat.apache.org
Sent: Wed, December 22, 2010 6:53:46 PM
Subject: Re: Tomcat Hangs with variable frequency
net.sourceforge.jtds.jdbc.JtdsResultSet.close ( JtdsResultSet.java:486 )
I think it is an issue with implementation of JtdsResultSet.close(), [1]
0485:if (!getConnection().isClosed()) {
0486:// Skip to end of result set
0487:// Could send cancel but this is safer as
0488:// cancel could kill other statements
in a batch.
0489:while (next())
0490:;
0491:}
[1]
http://www.java2s.com/Open-Source/Java-Document/Database-JDBC-Connection-Pool/jTDS/net/sourceforge/jtds/jdbc/JtdsResultSet.java.htm
[2]
http://jtds.svn.sourceforge.net/viewvc/jtds/branches/jTDS%201.2%20%28stable%29/src/main/net/sourceforge/jtds/jdbc/JtdsResultSet.java?revision=1107view=markup#l467
It tries to dispose the resultset by reading through it and hangs in
the process (or maybe the resultset is too big and reading it takes a
while).
Best regards,
Konstantin Kolinko
-
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Hangs with variable frequency
If closing the result set requires reading it in full (as JTDS does),
it can take significant time.
You should take thread dumps to see what the threads are doing and
what they are waiting for. (Three thread dumps taken several seconds
apart).
Post them inline, or somewhere else (like pastebin site). Attachments
are usually stripped off by the mailing list software.
2010/12/22 Rhonny David rhonnyda...@yahoo.com:
I won't support your reasoning, because the same JTDS driver version we are
using for our other site and there the number of concurrent users of the
application is more than 800 and therefore the volume of concurrent requests
is
very high, but we never faced the issue of this nature. Secondly, we have
recently started using JTD driver and tomcat jndi connection pooling for our
current site and earlier we used microsoft driver and our own connection
pooling
mechaninsm, but the same issue of tomcat hanging was occurring at that time.
Regards,
David
From: Konstantin Kolinko knst.koli...@gmail.com
To: Tomcat Users List users@tomcat.apache.org
Sent: Wed, December 22, 2010 6:53:46 PM
Subject: Re: Tomcat Hangs with variable frequency
net.sourceforge.jtds.jdbc.JtdsResultSet.close ( JtdsResultSet.java:486 )
I think it is an issue with implementation of JtdsResultSet.close(), [1]
0485: if (!getConnection().isClosed()) {
0486: // Skip to end of result set
0487: // Could send cancel but this is safer as
0488: // cancel could kill other statements
in a batch.
0489: while (next())
0490: ;
0491: }
[1]
http://www.java2s.com/Open-Source/Java-Document/Database-JDBC-Connection-Pool/jTDS/net/sourceforge/jtds/jdbc/JtdsResultSet.java.htm
[2]
http://jtds.svn.sourceforge.net/viewvc/jtds/branches/jTDS%201.2%20%28stable%29/src/main/net/sourceforge/jtds/jdbc/JtdsResultSet.java?revision=1107view=markup#l467
It tries to dispose the resultset by reading through it and hangs in
the process (or maybe the resultset is too big and reading it takes a
while).
Best regards,
Konstantin Kolinko
-
To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org
For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat Hangs with variable frequency
-BEGIN PGP SIGNED MESSAGE- Hash: SHA1 Konstantin, On 12/22/2010 11:56 AM, Konstantin Kolinko wrote: If closing the result set requires reading it in full (as JTDS does), it can take significant time. Especially if the queries are something like SELECT * FROM huge_table You should take thread dumps to see what the threads are doing and what they are waiting for. (Three thread dumps taken several seconds apart). I would also inspect the queries that are in progress when these connections appear to hang. We had a problem with Oracle long ago where the table indexes had just become horribly fragmented and performance slowed to a crawl. In an act of desperation, someone ran OPTIMIZE TABLE on one of the tables involved in particularly slow queries and basically everything got better. From then on out, we called that turning off the 'suck' bit on Oracle. :) I would definitely like to see what queries are running on the server and what their status is. The problem is certainly /not/ Tomcat, here: threads are stuck in a 3rd-party library connecting to a 3rd-party database. Tomcat just happens to be in the stack trace because that's the DBCP in use: the driver appears to be hanging, not Tomcat's DBCP. - -chris -BEGIN PGP SIGNATURE- Version: GnuPG v1.4.10 (MingW32) Comment: Using GnuPG with Mozilla - http://enigmail.mozdev.org/ iEYEARECAAYFAk0SNXUACgkQ9CaO5/Lv0PDAUQCfWgdgZY61qly2Z0xDP4vhZcbX OyYAn14lv4chUAmiD4h4z3jqgDPxOGda =Fqs8 -END PGP SIGNATURE- - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
