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From John Smith <tomcat.ran...@gmail.com>
Subject Tomcat Connection Pool Problems with XtraBackup
Date Sat, 11 Oct 2014 21:30:02 GMT
I'm trying to workout a managed backup scheme on a MySQL production
database with XtraBackup. According to our DBA, XtraBackup doesn't lock the
database, but issues a series of SHOW TABLE STATUS commands and then works
on the file system level.

Still, just as XtraBackup runs my logs start to blow up with connection
pool errors:

Error getting database connection:[http-nio-8080-exec-5] Timeout: Pool
empty. Unable to fetch a connection in 10 seconds, none available[size:100;
busy:100; idle:0; lastwait:10000].

There's some suggestion that turning off 'innodb-stats-on-metadata' might
help so we're trying that.

At the same time I want to confirm my connection pool settings are good:

<Resource name="jdbc/mydatabase_master"
          auth="Container"
          type="javax.sql.DataSource"
          factory="org.apache.tomcat.jdbc.pool.DataSourceFactory"
          testWhileIdle="true"
          testOnBorrow="true"
          testOnReturn="false"
          validationQuery="SELECT 1"
          validationInterval="30000"
          timeBetweenEvictionRunsMillis="30000"
          maxActive="100"
          minIdle="10"
          maxWait="10000"
          initialSize="10"
          removeAbandonedTimeout="60"
          removeAbandoned="true"
          minEvictableIdleTimeMillis="30000"

jdbcInterceptors="org.apache.tomcat.jdbc.pool.interceptor.ConnectionState;
            org.apache.tomcat.jdbc.pool.interceptor.StatementFinalizer"
          username="db_user"
          password="mypassword"
          driverClassName="com.mysql.jdbc.Driver"
          url="jdbc:mysql://my.ip:3306/my_database"
          />

For everything besides the backup, this configuration works very well. For
most of our traffic, the connection pool size hovers around the
initialSize. It seems like setting the maxActive higher will just spawn new
connections in the pool that are hanging. Anything strike you as..."too
tight" for lack of a better description, that would force the pool to
continuously add connections when the backup runs?

Anything else seem like it could be tweaked in relation to XtraBackup?

TIA,
John

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