DBCP connection pool settings on Tomcat
I use a connection pool on tomcat for my java web application.
Connections tomcat created was not what I had in mind.
Do I misunderstand properties initialSize, maxTotal, maxIdle, minIdle ?
Tomcat 8.0.48/PostgreSQL 9.4.9
My connection pool setting on Tomcat is;
<Resource name="jdbc/postgres_test" auth="Container"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://hostname:5432/sss_test"
username="sss_test"
password=""
initialSize="10"
maxTotal="10"
maxIdle="10"
minIdle="0"
maxWaitMillis="10000"
testOnBorrow="true"
validationQuery="select 1"
timeBetweenEvictionRunsMillis="5000"/>
Then I checked connections by sql on psql, It was like below,
(same as using netstat command)
sss_test=> SELECT count(client_addr) FROM pg_stat_activity group by client_addr;
client_addr | count
--------------+-------
A | 30
I expected 10 connections but it was 30.
java tomcat apache-commons-dbcp
asked Nov 13 '18 at 5:42
JesJes
12
|
show 1 more comment
I use a connection pool on tomcat for my java web application.
Connections tomcat created was not what I had in mind.
Do I misunderstand properties initialSize, maxTotal, maxIdle, minIdle ?
Tomcat 8.0.48/PostgreSQL 9.4.9
My connection pool setting on Tomcat is;
<Resource name="jdbc/postgres_test" auth="Container"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://hostname:5432/sss_test"
username="sss_test"
password=""
initialSize="10"
maxTotal="10"
maxIdle="10"
minIdle="0"
maxWaitMillis="10000"
testOnBorrow="true"
validationQuery="select 1"
timeBetweenEvictionRunsMillis="5000"/>
Then I checked connections by sql on psql, It was like below,
(same as using netstat command)
sss_test=> SELECT count(client_addr) FROM pg_stat_activity group by client_addr;
client_addr | count
--------------+-------
A | 30
I expected 10 connections but it was 30.
java tomcat apache-commons-dbcp
asked Nov 13 '18 at 5:42
JesJes
12
Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Rather than printing the count, what does theclient_addrlook like - same?
– Scary Wombat
Nov 13 '18 at 6:50
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00
|
show 1 more comment
I use a connection pool on tomcat for my java web application.
Connections tomcat created was not what I had in mind.
Do I misunderstand properties initialSize, maxTotal, maxIdle, minIdle ?
Tomcat 8.0.48/PostgreSQL 9.4.9
My connection pool setting on Tomcat is;
<Resource name="jdbc/postgres_test" auth="Container"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://hostname:5432/sss_test"
username="sss_test"
password=""
initialSize="10"
maxTotal="10"
maxIdle="10"
minIdle="0"
maxWaitMillis="10000"
testOnBorrow="true"
validationQuery="select 1"
timeBetweenEvictionRunsMillis="5000"/>
Then I checked connections by sql on psql, It was like below,
(same as using netstat command)
sss_test=> SELECT count(client_addr) FROM pg_stat_activity group by client_addr;
client_addr | count
--------------+-------
A | 30
I expected 10 connections but it was 30.
java tomcat apache-commons-dbcp
asked Nov 13 '18 at 5:42
JesJes
12
I use a connection pool on tomcat for my java web application.
Connections tomcat created was not what I had in mind.
Do I misunderstand properties initialSize, maxTotal, maxIdle, minIdle ?
Tomcat 8.0.48/PostgreSQL 9.4.9
My connection pool setting on Tomcat is;
<Resource name="jdbc/postgres_test" auth="Container"
type="javax.sql.DataSource"
driverClassName="org.postgresql.Driver"
url="jdbc:postgresql://hostname:5432/sss_test"
username="sss_test"
password=""
initialSize="10"
maxTotal="10"
maxIdle="10"
minIdle="0"
maxWaitMillis="10000"
testOnBorrow="true"
validationQuery="select 1"
timeBetweenEvictionRunsMillis="5000"/>
Then I checked connections by sql on psql, It was like below,
(same as using netstat command)
sss_test=> SELECT count(client_addr) FROM pg_stat_activity group by client_addr;
client_addr | count
--------------+-------
A | 30
I expected 10 connections but it was 30.
java tomcat apache-commons-dbcp
java tomcat apache-commons-dbcp
asked Nov 13 '18 at 5:42
JesJes
12
asked Nov 13 '18 at 5:42
JesJes
12
edited Nov 13 '18 at 6:52
Jes
asked Nov 13 '18 at 5:42
JesJes
12
asked Nov 13 '18 at 5:42
JesJes
12
asked Nov 13 '18 at 5:42
JesJes
12
12
Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Rather than printing the count, what does theclient_addrlook like - same?
– Scary Wombat
Nov 13 '18 at 6:50
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00
|
show 1 more comment
Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Rather than printing the count, what does theclient_addrlook like - same?
– Scary Wombat
Nov 13 '18 at 6:50
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00
Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Rather than printing the count, what does the
client_addr look like - same?– Scary Wombat
Nov 13 '18 at 6:50
Rather than printing the count, what does the
client_addr look like - same?– Scary Wombat
Nov 13 '18 at 6:50
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00
|
show 1 more comment
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Are they active connections? what is your query?
– user7294900
Nov 13 '18 at 6:03
Rather than printing the count, what does the
client_addrlook like - same?– Scary Wombat
Nov 13 '18 at 6:50
@user7294900 They were all idle connections. It was just after server started.
– Jes
Nov 13 '18 at 6:54
@Scary Wombat Sorry, I edited my sql it was wrong, client_addr was same!
– Jes
Nov 13 '18 at 6:55
See stackoverflow.com/questions/13236160/…
– user7294900
Nov 13 '18 at 7:00