Hi subbis,
If I let the iteration loop over 5000, I get that exception, It
seems (I am not sure) openjpa is creating a new connection and after a
while mysql runs out of connection. I tried the same code and iteration
loop with a connection pool and it works fine. That should get you
moving as of now, till someone from Open JPA team looks into the issue.
Thanks and Regards,
Nitish Kumar
-----Original Message-----
From: Shubbis [mailto:[email protected]]
Sent: Thursday, March 19, 2009 1:50 PM
To: [email protected]
Subject: Re: Slow performance with OpenJPA when selecting from a
ManyToMany relation.
Hi, thanks for the suggestion, but we are aware of that, and we have
turned
it off on EclipseLink to even the playingfield.
Today we found a new problem with OpenJPA. When running the following
method
we get a similar type of performance hit and an Exception after the
first
run. Note: This exception is the same one we get when running the
ManyToMany
test in a loop.
The method:
public void insertDeliveryCompany(int iterations) throws
Exception{
log.setMethod(iterations);
for (int i = 0; i < 10; i++) {
// DeliveryCompany med contactinfo, adress,
areacode og country
IDeliveryCompanyDAO dcDao =
daoFactory.getDeliveryCompanyDAO();
DeliveryCompany deliveryCompany;
ArrayList<DeliveryCompany> deliveryCompanies =
new
ArrayList<DeliveryCompany>();
// Fyller DeliveryCompany listen
for(int interval = 0; interval < iterations;
interval++){
// Region
Region region = new Region();
region.setRegion("insertDeliveryCompanyRegion");
// Country
Country country = new Country();
country.setCountry("insertDeliveryCompanyCountry");
country.setRegion(region);
// AreaCode
AreaCode areaCode = new AreaCode();
areaCode.setArea("insertDeliveryCompanyAreaCode");
areaCode.setCountry(country);
// Address
Address address = new Address();
address.setAddress("insertDeliveryCompanyAddress");
address.setAreaCode(areaCode);
// ContactInfo
ContactInfo contactInfo = new
ContactInfo();
contactInfo.setAddress(address);
contactInfo.setEmail("insertDeliveryCompanyEmail");
contactInfo.setPhoneNr("insertDeliveryCompanyPhoneNr");
// Fyller DeliveryCompany listen
deliveryCompany = new DeliveryCompany();
deliveryCompany.setCompanyName("insertDeliveryCompany");
deliveryCompany.setContactInfo(contactInfo);
deliveryCompanies.add(deliveryCompany);
}
log.registerStart();
daoFactory.beginTransaction();
for (int j = 1; j <= iterations; j++) {
dcDao.save(deliveryCompanies.get(j-1));
log.registerIteration(j + 1);
}
daoFactory.commitTransaction();
// daoFactory.resetEntityManager();
log.registerEnd();
}
log.endMethod();
}
And the console dump:
94 OpenJPAPU INFO [main] openjpa.Runtime - Starting OpenJPA 1.2.0
172 OpenJPAPU INFO [main] openjpa.jdbc.JDBC - Using dictionary class
"org.apache.openjpa.jdbc.sql.MySQLDictionary".
OPENJPA (insertDeliveryCompany): 43500
0 OpenJPAPU INFO [main] openjpa.Runtime - Starting OpenJPA 1.2.0
0 OpenJPAPU INFO [main] openjpa.jdbc.JDBC - Using dictionary class
"org.apache.openjpa.jdbc.sql.MySQLDictionary".
<openjpa-1.2.0-r422266:683325 nonfatal general error>
org.apache.openjpa.persistence.PersistenceException: Communications link
failure
Last packet sent to the server was 0 ms ago.
at
org.apache.openjpa.jdbc.sql.DBDictionary.narrow(DBDictionary.java:4238)
at
org.apache.openjpa.jdbc.sql.DBDictionary.newStoreException(DBDictionary.
java:4203)
at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:10
2)
at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:88
)
at
org.apache.openjpa.jdbc.sql.SQLExceptions.getStore(SQLExceptions.java:64
)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connect(JDBCStoreManager
.java:868)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.getConnection(JDBCStoreM
anager.java:229)
at
org.apache.openjpa.jdbc.sql.SelectImpl.execute(SelectImpl.java:371)
at
org.apache.openjpa.jdbc.sql.SelectImpl.execute(SelectImpl.java:325)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.getInitializeStateResult
(JDBCStoreManager.java:441)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initializeState(JDBCStor
eManager.java:321)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.initialize(JDBCStoreMana
ger.java:277)
at
org.apache.openjpa.kernel.DelegatingStoreManager.initialize(DelegatingSt
oreManager.java:111)
at
org.apache.openjpa.kernel.ROPStoreManager.initialize(ROPStoreManager.jav
a:57)
at
org.apache.openjpa.kernel.BrokerImpl.initialize(BrokerImpl.java:894)
at
org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:852)
at
org.apache.openjpa.kernel.BrokerImpl.find(BrokerImpl.java:774)
at
org.apache.openjpa.kernel.BrokerImpl.isDetached(BrokerImpl.java:4286)
at
org.apache.openjpa.kernel.SingleFieldManager.persist(SingleFieldManager.
java:257)
at
org.apache.openjpa.kernel.StateManagerImpl.cascadePersist(StateManagerIm
pl.java:2893)
at
org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2457)
at
org.apache.openjpa.kernel.BrokerImpl.persist(BrokerImpl.java:2280)
at
org.apache.openjpa.kernel.DelegatingBroker.persist(DelegatingBroker.java
:1021)
at
org.apache.openjpa.persistence.EntityManagerImpl.persist(EntityManagerIm
pl.java:645)
at
project.ojpa.dao.DeliveryCompanyDAO.save(DeliveryCompanyDAO.java:55)
at
project.tests.InsertManager.insertDeliveryCompany(InsertManager.java:233
)
at project.client.AnalyticsClient.main(AnalyticsClient.java:67)
Caused by: com.mysql.jdbc.CommunicationsException: Communications link
failure
Last packet sent to the server was 0 ms ago.
at
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070
)
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2120)
at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:723)
at
com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:298)
at
com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:28
2)
at
org.apache.openjpa.jdbc.schema.SimpleDriverDataSource.getConnection(Simp
leDriverDataSource.java:81)
at
org.apache.openjpa.jdbc.schema.SimpleDriverDataSource.getConnection(Simp
leDriverDataSource.java:76)
at
org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection(Delegatin
gDataSource.java:113)
at
org.apache.openjpa.lib.jdbc.DecoratingDataSource.getConnection(Decoratin
gDataSource.java:93)
at
org.apache.openjpa.lib.jdbc.DelegatingDataSource.getConnection(Delegatin
gDataSource.java:113)
at
org.apache.openjpa.jdbc.schema.DataSourceFactory$DefaultsDataSource.getC
onnection(DataSourceFactory.java:305)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connectInternal(JDBCStor
eManager.java:879)
at
org.apache.openjpa.jdbc.kernel.JDBCStoreManager.connect(JDBCStoreManager
.java:864)
... 21 more
Caused by: com.mysql.jdbc.CommunicationsException: The driver was unable
to
create a connection due to an inability to establish the client portion
of a
socket.
This is usually caused by a limit on the number of sockets imposed by
the
operating system. This limit is usually configurable.
For Unix-based platforms, see the manual page for the 'ulimit' command.
Kernel or system reconfiguration may also be required.
For Windows-based platforms, see Microsoft Knowledge Base Article 196271
(Q196271).
at
com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1070
)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:335)
at
com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2043)
... 32 more
Caused by: java.net.BindException: Address already in use: connect
at java.net.PlainSocketImpl.socketConnect(Native Method)
at java.net.PlainSocketImpl.doConnect(Unknown Source)
at java.net.PlainSocketImpl.connectToAddress(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at java.net.Socket.<init>(Unknown Source)
at
com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:
253)
at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:284)
... 33 more
Kevin Sutter wrote:
>
> One other interesting bit of information... I just heard that
EclipseLink
> runs with a data cache enabled by default, while OpenJPA and Hibernate
do
> not. Although this setting may not get us completely out of this
> ManyToMany
> performance hole, it is something to be aware of as these performance
> benchmarks are done...
>
--
View this message in context:
http://n2.nabble.com/Slow-performance-with-OpenJPA-when-selecting-from-a
-ManyToMany-relation.-tp2466994p2501684.html
Sent from the OpenJPA Users mailing list archive at Nabble.com.
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