Crashed connection blocks connections from other pools

Setup:
WLS 8.1.0.0 with 2-node cluster
Sybase: 12.0 and 12.5
jConnect 5.5 (EBF11248)
Java HotSpot(TM) Client VM Version 1.4.2-b28
I have two databases (DB1 & DB2) and two connection pools (P1 & P2), each pointing
to a corresponding DB. The pools are created at WLS startup.
Later on, say, DB1 is disconnected (crashed or lost network connectivity). We
found that all connections, whether to DB1 or DB2, becomes extremely slow (on
the order of 10+ mins) to obtain. The stack dumps (see following example) indicate
the crashed one (Thread-36) was stuck at a socket connection and all the others
(for DB2/P2) were waiting for the lock (0xf26b1958) during DriverManager.getConnection
(eg. Thread-153).
While searching at BEA, I noticed a fix CR125320 for 8.1 sp2 that seems to be
relevant but I'm not sure that's the exact fix. That fix specifically mentions
JTSConnection.doClose() but our dump doesn't show that.
Please help.
Thanks,
Bill
"Thread-36" daemon prio=5 tid=0x00da23a8 nid=0x8a runnable [5e97f000..5e9819a0]
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
- locked <0x82db64c0> (a java.net.PlainSocketImpl)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at com.sybase.jdbc2.timedio.RawDbio.doConnect(RawDbio.java:88)
at com.sybase.jdbc2.timedio.InStreamMgr.<init>(InStreamMgr.java:94)
at com.sybase.jdbc2.tds.Tds.login(Tds.java:375)
at com.sybase.jdbc2.jdbc.SybConnection.tryLogin(SybConnection.java:221)
at com.sybase.jdbc2.jdbc.SybConnection.regularConnect(SybConnection.java:198)
at com.sybase.jdbc2.jdbc.SybConnection.<init>(SybConnection.java:177)
at com.sybase.jdbc2.jdbc.SybConnection.<init>(SybConnection.java:129)
at com.sybase.jdbc2.jdbc.SybDriver.connect(SybDriver.java:179)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(ConnectionEnvFactory.java:175)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:111)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1092)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1029)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:320)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:253)
at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:339)
at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:78)
at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:85)
at weblogic.jdbc.pool.Driver.connect(Driver.java:144)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
- locked <0xf26b1958> (a java.lang.Class)
at java.sql.DriverManager.getConnection(DriverManager.java:193)
- locked <0xf26b1958> (a java.lang.Class)
"Thread-153" daemon prio=5 tid=0x00c46280 nid=0xff waiting for monitor entry [57480000..574819a0]
at java.sql.DriverManager.getConnection(DriverManager.java:187)
- waiting to lock <0xf26b1958> (a java.lang.Class)

For the crashed DB, when one tries to get a connection, it gets stuck on a socket
connection. This means all subsequent requsts will all take a long time to just
come out and say it didn't work.
"Slava Imeshev" <[email protected]> wrote:
"Bill" <[email protected]> wrote in message news:[email protected]...
Thanks, Slava. You are right - getConnection is "public static synchronizedConnection
getConnection(String url)". However, how would one reduce the timeouton the socket
read on the crashed DB?I'd fix this problem first. In case of failure you serialize recreation
of the
connections. Depending on number of concurrent requests the process
of recovery can be noticeably lengthy. Fix it and re-do the test.
Regards,
Slava Imeshev
"Slava Imeshev" <[email protected]> wrote:
Don't use DriverManager to obtain connections. DriverManager contains
a lot class-level synchronization and is not recommended for use in
J2EE
environment. The best option is using DataSource obtained via a JNDI
lookup.
Or, use
Driver driver = ((Driver)Class.forName("my.driver")).newInstance();
Properties props = new Properties();
Connection conn = driver.connect(url, props);
Regards,
Slava Imeshev
"Bill" <[email protected]> wrote in message news:[email protected]...
Setup:
WLS 8.1.0.0 with 2-node cluster
Sybase: 12.0 and 12.5
jConnect 5.5 (EBF11248)
Java HotSpot(TM) Client VM Version 1.4.2-b28
I have two databases (DB1 & DB2) and two connection pools (P1 &
P2),
each pointing
to a corresponding DB. The pools are created at WLS startup.
Later on, say, DB1 is disconnected (crashed or lost network connectivity).We
found that all connections, whether to DB1 or DB2, becomes extremelyslow (on
the order of 10+ mins) to obtain. The stack dumps (see following
example)
indicate
the crashed one (Thread-36) was stuck at a socket connection and
all
the others
(for DB2/P2) were waiting for the lock (0xf26b1958) during DriverManager.getConnection
(eg. Thread-153).
While searching at BEA, I noticed a fix CR125320 for 8.1 sp2 that
seems
to be
relevant but I'm not sure that's the exact fix. That fix specificallymentions
JTSConnection.doClose() but our dump doesn't show that.
Please help.
Thanks,
Bill
"Thread-36" daemon prio=5 tid=0x00da23a8 nid=0x8a runnable [5e97f000..5e9819a0]
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(PlainSocketImpl.java:305)
- locked <0x82db64c0> (a java.net.PlainSocketImpl)
at java.net.PlainSocketImpl.connectToAddress(PlainSocketImpl.java:171)
at java.net.PlainSocketImpl.connect(PlainSocketImpl.java:158)
at java.net.Socket.connect(Socket.java:452)
at java.net.Socket.connect(Socket.java:402)
at java.net.Socket.<init>(Socket.java:309)
at java.net.Socket.<init>(Socket.java:124)
at com.sybase.jdbc2.timedio.RawDbio.doConnect(RawDbio.java:88)
at com.sybase.jdbc2.timedio.InStreamMgr.<init>(InStreamMgr.java:94)
at com.sybase.jdbc2.tds.Tds.login(Tds.java:375)
at com.sybase.jdbc2.jdbc.SybConnection.tryLogin(SybConnection.java:221)
at com.sybase.jdbc2.jdbc.SybConnection.regularConnect(SybConnection.java:198)
at com.sybase.jdbc2.jdbc.SybConnection.<init>(SybConnection.java:177)
at com.sybase.jdbc2.jdbc.SybConnection.<init>(SybConnection.java:129)
at com.sybase.jdbc2.jdbc.SybDriver.connect(SybDriver.java:179)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.makeConnection(ConnectionEnvFactory.java:175)
at weblogic.jdbc.common.internal.ConnectionEnvFactory.createResource(ConnectionEnvFactory.java:111)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1092)
at weblogic.common.resourcepool.ResourcePoolImpl.makeResources(ResourcePoolImpl.java:1029)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:320)
at weblogic.common.resourcepool.ResourcePoolImpl.reserveResource(ResourcePoolImpl.java:253)
at weblogic.jdbc.common.internal.ConnectionPool.reserve(ConnectionPool.java:339)
at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:78)
at weblogic.jdbc.common.internal.ConnectionPoolManager.reserve(ConnectionPoolManager.java:85)
at weblogic.jdbc.pool.Driver.connect(Driver.java:144)
at java.sql.DriverManager.getConnection(DriverManager.java:512)
- locked <0xf26b1958> (a java.lang.Class)
at java.sql.DriverManager.getConnection(DriverManager.java:193)
- locked <0xf26b1958> (a java.lang.Class)
"Thread-153" daemon prio=5 tid=0x00c46280 nid=0xff waiting for monitorentry [57480000..574819a0]
at java.sql.DriverManager.getConnection(DriverManager.java:187)
- waiting to lock <0xf26b1958> (a java.lang.Class)

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Does anyone know if anything changed from 6.0 to 7?
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.newInstance();
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+
dbName,
null);
>>>>>>>>>
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ip access-list extended VLAN20_ACL
deny ip 10.20.50.0 0.0.0.255 10.20.60.0 0.0.0.255
permit ip any any
ip access-list extended VLAN20_ACL
deny ip 10.20.40.0 0.0.0.255 10.20.60.0 0.0.0.255
permit ip any any
ip access-list extended VLAN20_ACL
deny ip 10.20.30.0 0.0.0.255 10.20.60.0 0.0.0.255
permit ip any any
ip access-list extended VLAN20_ACL
deny ip 192.168.4.0 0.0.0.255 10.20.60.0 0.0.0.255
permit ip any any
int vlan 20
access-group in VLAN20_ACL
int vlan 30
access-group in VLAN30_ACL
Now technically, 10.20.60.0/24 could still get to the other subnets, but the return traffic would be blocked.
And you could always change the permit ip any any to just HTTP traffic, etc. Depends on what you want to do.
Although it might be a better idea to configure ACLs on the firewall. It would be easier to manage that way. If traffic has to go up to the ASA to get back to the other subnets.

Many Applications Crashing On Startup - fine from other account

Just got a problem where many of my apps won't open, they crash with some kind of data access type failure - nothing consistent though.
Console won't run, neither will Activity Monitor, Disk utility, Ableton Live, Quicktime etc.
I created another account and logged into that and Quicktime, Disk utility worked fine.
So its looking like a software issue - can anyone point me in the right direction? Thanks.

Since the issue is specific to your original user account, you can proceed in two ways. One is to log into your new account, make a list of the preference files (plists) located in /username/Library/Preferences/, including any in the ByHost subfolder, log back into the original account, move everything on that other account's list from the original account's Preferences folder into a newly created folder on the Desktop, log out and back in, and see if the problem goes away. If so, you can copy the ones in the Desktop folder (one at time) back into /Preferences/, restart, and see if the problem returns. If so, you've identified the corrupt/conflicting one. Continue with all of them until isolating the bad ones. That'll save you the trouble of resetting preferences.
The second way is much more detailed and I'll not burden you with the steps unless the above doesn't fix the issue.

Crashed connection blocks connections from other pools

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