[Deploying Sakai] database connections disappearing
Charles Hedrick
hedrick at rutgers.edu
Sun Nov 1 09:12:16 PST 2009
I went to 1.5.3 on one of 5 front ends a week ago. We just moved to it
on all 5 yesterday. However it's not clear whether it's fixed what I
wanted it to fix. I'm beginning to suspect that the pauses I'm trying
to fix are due to paging. I'm going to try to make my JVM's a little
smaller.
On Nov 1, 2009, at 1:20:09 AM, David Horwitz wrote:
> Hi Chuck,
>
> Have you tried upgrading commons-pool? We've upgraded commons-pool
> in the 1.1 kernel to 1.5.2 (we should go to 1.5.3) without any
> noticeable problems. OOTB the 1.0 kernels are using commons-pool 1.3
>
> D
>
> Charles Hedrick wrote:
>>
>> Since we moved from 2.5 to 2.6 I've been seeing databaSe
>> connections disappear. We start out with 300. We have set up dbcp
>> to keep a constant 300. However over time we start building up
>> connections that dbcp thinks are in use, but never get returned.
>> The rate is about 3 per day. The obvious suspicion would be that
>> Sakai is getting a connection from the pool and not returning it.
>> However doing "netstat" it's clear that the TCP connections are no
>> longer open. I doubt that the server is closing them. It didn't in
>> the past, and with a nearly idle front end we don't lose any. The
>> amount we lose seems to be connected to activity. There's no way
>> Sakai itself could be closing the TCP connection, since we don't
>> set the option that lets the program access the underlying
>> connection, and of course closing a pooled connection simply
>> returns it to the pool. it looks to me like a malfunction in dbcp
>> or pool. However it doesn't appear that dbcp has changed since 2.5.
>>
>>
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