So it's safe to say that there is not a large user base of people
pairing pgpool with java?
On 10/17/2011 08:21 PM, Tatsuo Ishii wrote:
Takahiro,
Any comment on this?
--
Tatsuo Ishii
SRA OSS, Inc. Japan
English: http://www.sraoss.co.jp/index_en.php
Japanese: http://www.sraoss.co.jp
Greetings all, I'm new to the list.
I've been experimenting with pgpool since the 3.0.1 release.
We have never implemented this in production -- largely because of the
errors we've found during testing.
We have intermittent failures with pgpool-II when using the JDBC
driver.
I'm currently using:
A brand-new build of pgpool-II version 3.1.
postgresql 9.0-801-jdbc4 version of the JDBC drivers.
My testing server backends are:
Postgres 9.0.4, UTF8, on 32bit Ubuntu 10.04.
They are configured for streaming replication (which is working very
well).
My java application is making use of the standard JDBC non-pooling
data source (with autoCommit = true) to create connections on multiple
threads.
Our production configuration currently looks like this:
Application -> C3P0 (Connection Pool) -> JDBC Driver -> master
database
I have tested the following configurations in my test environment:
Application -> C3P0 -> JDBC Driver -> pgpool-II -> database(s)
Application -> JDBC Driver -> pgpool-II -> database(s)
In both setups, I continue to have issues with prepared statements and
'portals' (I think) which the JDBC driver reports as non-existent.
I have set prepareThreshold=0 on the JDBC driver, to disable statement
caching, and still get these errors.
Occasionally, during testing, we see messages that look like this:
Caused by: org.postgresql.util.PSQLException: ERROR: prepared
statement "S_18" does not exist
at
org.postgresql.core.v3.QueryExecutorImpl.receiveErrorResponse(QueryExecutorImpl.java:2102)
at
org.postgresql.core.v3.QueryExecutorImpl.processResults(QueryExecutorImpl.java:1835)
at
org.postgresql.core.v3.QueryExecutorImpl.execute(QueryExecutorImpl.java:257)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.execute(AbstractJdbc2Statement.java:500)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeWithFlags(AbstractJdbc2Statement.java:388)
at
org.postgresql.jdbc2.AbstractJdbc2Statement.executeQuery(AbstractJdbc2Statement.java:273)
This causes our application to (obviously) have issues.
Is there a known good configuration for the JDBC driver& data sources
that should make this work reliably?
Attached is my pgpool configuration.
Thank you for any help / suggestions!
Regards,
-Bryan
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