Cannot make use of concurrency-strategy
Hi!
First goes the abstract: despite all other parameters, the only setting that seems
to make a difference for transaction handling is <isolation-level>. What I really
want to make use of, is <concurrency-strategy>. Ultimately I want to make use of
Optimistic concurrency strategy of WL70, but looks like that even Exclusive strategy
does not work in my case.
Here is my description of my test app:
1. I have TxDataSource defined in Weblogic Console. Standard Datasource seems not
to support transactions at all.
2. I have two instances of the Client -- C1 and C2, Session Bean -- S, and Entity
Bean -- E.
3. I start C1, it locates S and calls business method with Required attribute on
it.
4. Business method on S finds E using E.find(PK). All methods on E has attribute
Mandatory.
5. Business method on S goes to sleep for 15 seconds: Thread.sleep(15000). I know
that in real-world applications one cannot use threads in EJB, but I have to test
concurrent access to the same data from different clients and this was the easiest
way to do what I needed. Anyway, it is just a test.
6. While S is sleeping in business method, I start C2. It locates S (creates new
instance?), calls business method on it, which in turn, locates E (new instance of
E?), calls find() on it and goes to sleep for the same 15 seconds. Note, that for
<concurrency-strategy>Exclusive</concurrency-strategy> I expected second client to
be unable to find() Entity bean, because it should be locked by the first client.
Quite opposite, it can be located by S. This is weird for me.
7. Business method on S for the first client awakes and calls business method on
E (with Mandatory attribute). It changes data and commits. Fine.
8. Business method on S for the second client awakes and calls business method on
E to change data. Then it exits, and - surprise! - commits data! Even in Exclusive
mode. The same thing in Optimistic mode with <verify-columns> parameter.
<isolation-level> set to TRANSACTION_READ_COMMITTED, server is Sybase Adaptive Server
v.12.
The record in database is not locked on find(), because I can UPDATE record using
Sybase SQL Advantage client.
If I change <isolation-level> to TRANSACTION_REPEATABLE_READ or TRANSACTION_SERIALIZABLE,
then record is locked at find(). But this does not have anyhting with optimistic
locking! I want record to remain unlocked and to be checked for possible update by
other client during commit! Also, for Exclusive mode I suppose that I cannot even
find() entity bean for the same PK, that was already found by other client. What
am I doing wrong?
Here is some info:
1. JDBC Tx Data Source:
Name: SybaseDataSource
JNDI Name: sybaseDataSource
Pool Name: sybasePool
Emulate Two-Phase Commit for non-XA Driver (No)
Row Prefetch Enabled (No)
Row Prefetch Size: 48
Stream Chunk Size: 256 bytes
2. ejb-jar.xml:
<?xml version="1.0"?>
<!DOCTYPE ejb-jar PUBLIC '-//Sun Microsystems, Inc.//DTD Enterprise JavaBeans 2.0//EN'
'http://java.sun.com/dtd/ejb-jar_2_0.dtd'>
<ejb-jar>
<enterprise-beans>
<entity>
<ejb-name>OptTestDataEJB</ejb-name>
<local-home>com.xxx.yyy.ejb.entity.OptTestDataHome</local-home>
<local>com.xxx.yyy.ejb.entity.OptTestData</local>
<ejb-class>com.xxx.yyy.ejb.entity.OptTestDataBean</ejb-class>
<persistence-type>Container</persistence-type>
<prim-key-class>java.lang.Integer</prim-key-class>
<reentrant>False</reentrant>
<cmp-version>2.x</cmp-version>
<abstract-schema-name>OptTestDataEJB</abstract-schema-name>
<cmp-field>
<field-name>id</field-name>
</cmp-field>
<cmp-field>
<field-name>numData</field-name>
</cmp-field>
<cmp-field>
<field-name>strData</field-name>
</cmp-field>
<primkey-field>id</primkey-field>
<query>
<query-method>
<method-name>findByDrawId</method-name>
<method-params>
<method-param>int</method-param>
</method-params>
</query-method>
<ejb-ql>
<![CDATA[SELECT OBJECT(o) FROM OptTestDataEJB AS o WHERE o.id = ?1]]>
</ejb-ql>
</query>
</entity>
<session>
<ejb-name>OptTestMgrEJB</ejb-name>
<home>com.xxx.yyy.ejb.session.OptTestMgrHome</home>
<remote>com.xxx.yyy.ejb.session.OptTestMgr</remote>
<ejb-class>com.xxx.yyy.ejb.session.OptTestMgrBean</ejb-class>
<session-type>Stateless</session-type>
<transaction-type>Container</transaction-type>
</session>
</enterprise-beans>
<assembly-descriptor>
<container-transaction>
<method>
<ejb-name>OptTestMgrEJB</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Required</trans-attribute>
</container-transaction>
<container-transaction>
<method>
<ejb-name>OptTestDataEJB</ejb-name>
<method-name>*</method-name>
</method>
<trans-attribute>Mandatory</trans-attribute>
</container-transaction>
</assembly-descriptor>
</ejb-jar>
3. weblogic-cmp-rdbms-jar.xml:
<?xml version="1.0"?>
<!DOCTYPE weblogic-rdbms-jar PUBLIC '-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB
RDBMS Persistence//EN' 'http://www.bea.com/servers/wls700/dtd/weblogic-rdbms20-persistence-700.dtd'>
<weblogic-rdbms-jar>
<weblogic-rdbms-bean>
<ejb-name>OptTestDataEJB</ejb-name>
<data-source-name>sybaseDataSource</data-source-name>
<table-map>
<table-name>optTest</table-name>
<field-map>
<cmp-field>id</cmp-field>
<dbms-column>ID</dbms-column>
</field-map>
<field-map>
<cmp-field>numData</cmp-field>
<dbms-column>NUM_DATA</dbms-column>
</field-map>
<field-map>
<cmp-field>strData</cmp-field>
<dbms-column>STR_DATA</dbms-column>
</field-map>
<verify-columns>Timestamp</verify-columns>
<optimistic-column>CONTROL_DATA</optimistic-column>
<!-- The same with <verify-columns> set to Read or Modified -->
</table-map>
</weblogic-rdbms-bean>
</weblogic-rdbms-jar>
3. weblogic-ejb-jar.xml:
<?xml version="1.0"?>
<!DOCTYPE weblogic-ejb-jar PUBLIC "-//BEA Systems, Inc.//DTD WebLogic 7.0.0 EJB//EN"
"http://www.bea.com/servers/wls700/dtd/weblogic-ejb-jar.dtd">
<weblogic-ejb-jar>
<weblogic-enterprise-bean>
<ejb-name>OptTestDataEJB</ejb-name>
<entity-descriptor>
<entity-cache>
<read-timeout-seconds>3</read-timeout-seconds>
<concurrency-strategy>Optimistic</concurrency-strategy>
</entity-cache>
<persistence>
<persistence-use>
<type-identifier>WebLogic_CMP_RDBMS</type-identifier>
<type-version>7.0</type-version>
<type-storage>META-INF/weblogic-cmp-rdbms-jar.xml</type-storage>
</persistence-use>
</persistence>
</entity-descriptor>
<local-jndi-name>abs.OptTestData</local-jndi-name>
</weblogic-enterprise-bean>
<weblogic-enterprise-bean>
<ejb-name>OptTestMgrEJB</ejb-name>
<stateless-session-descriptor>
</stateless-session-descriptor>
<jndi-name>abs.OptTestMgr</jndi-name>
</weblogic-enterprise-bean>
<transaction-isolation>
<isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
<!-- <isolation-level>TRANSACTION_SERIALIZABLE</isolation-level> -->
<!-- <isolation-level>TRANSACTION_REPEATABLE_READ</isolation-level> -->
<method>
<ejb-name>OptTestDataEJB</ejb-name>
<method-intf>Local</method-intf>
<method-name>*</method-name>
</method>
</transaction-isolation>
<transaction-isolation>
<isolation-level>TRANSACTION_READ_COMMITTED</isolation-level>
<!-- <isolation-level>TRANSACTION_SERIALIZABLE</isolation-level> -->
<!-- <isolation-level>TRANSACTION_REPEATABLE_READ</isolation-level> -->
<method>
<ejb-name>OptTestMgrEJB</ejb-name>
<method-intf>Remote</method-intf>
<method-name>*</method-name>
</method>
</transaction-isolation>
</weblogic-ejb-jar>
Please, advise me what I have to do with this stuff.
Can you kindly elaborate the actual issue and what was wrong in it?
Similar Messages
-
Cannot make use of concurrency-strategy (more readable)
Hi!
First goes the abstract: despite all other parameters, the only setting that seems
to make a difference for transaction handling is <isolation-level>. What I really
want to make use of, is <concurrency-strategy>. Ultimately I want to make use of
Optimistic concurrency strategy of WL70, but looks like that even Exclusive strategy
does not work in my case.
Here is my description of my test app:
1. I have TxDataSource defined in Weblogic Console. Standard Datasource seems not
to support transactions at all.
2. I have two instances of the Client -- C1 and C2, Session Bean -- S, and Entity
Bean -- E.
3. I start C1, it locates S and calls business method with Required attribute on
it.
4. Business method on S finds E using E.find(PK). All methods on E has attribute
Mandatory.
5. Business method on S goes to sleep for 15 seconds: Thread.sleep(15000). I know
that in real-world applications one cannot use threads in EJB, but I have to test
concurrent access to the same data from different clients and this was the easiest
way to do what I needed. Anyway, it is just a test.
6. While S is sleeping in business method, I start C2. It locates S (creates new
instance?), calls business method on it, which in turn, locates E (new instance of
E?), calls find() on it and goes to sleep for the same 15 seconds. Note, that for
<concurrency-strategy>Exclusive</concurrency-strategy> I expected second client to
be unable to find() Entity bean, because it should be locked by the first client.
Quite opposite, it can be located by S. This is weird for me.
7. Business method on S for the first client awakes and calls business method on
E (with Mandatory attribute). It changes data and commits. Fine.
8. Business method on S for the second client awakes and calls business method on
E to change data. Then it exits, and - surprise! - commits data! Even in Exclusive
mode. The same thing in Optimistic mode with <verify-columns> parameter.
<isolation-level> set to TRANSACTION_READ_COMMITTED, server is Sybase Adaptive Server
v.12.
The record in database is not locked on find(), because I can UPDATE record using
Sybase SQL Advantage client.
If I change <isolation-level> to TRANSACTION_REPEATABLE_READ or TRANSACTION_SERIALIZABLE,
then record is locked at find(). But this does not have anyhting with optimistic
locking! I want record to remain unlocked and to be checked for possible update by
other client during commit! Also, for Exclusive mode I suppose that I cannot even
find() entity bean for the same PK, that was already found by other client. What
am I doing wrong?
Additional info is attached.
[qqq.txt]
Hi Mike,
as I already posted I resolved the problem. Thanks anyway. My biggest
mistake was that I was evaluating WL7 features, and to make my like easier,
I was changing settings in the deployment descriptors within JAR file! Heh,
because I did not run EJBC, I had stale classes in JAR file (those stubs and
other helper classes that WL generates), that is why the whole thing did not
work. Those stubs are generated by WLS based on setting in descriptors, that
I personally find wrong, because it turns the whole "write code -- change
descriptor while deploing" idea upside down. Anyway, t was my mistake.
It works now with "Read" and "Modified" concurrency methods, but does not
work with Timestamp field. Frankly, I did not try hard to make it work with
Timestamp.
So, when I understood the fact that <concurrency-strategy> works on bean
level, and <isolation-level> works on database level, everything became
clear.
WBR,
Michael Jouravlev.
"mike" <[email protected]> wrote in message
news:[email protected]...
>
> Hi.
> I'm just done struggling with similar case. Difference is I use Oracle
(have not
> used SB for a while...) and 6.1. Both minor, IMHO. Also please
<imho></imho> each
> statement below.
>
> "Michael Jouravlev" <[email protected]> wrote:
> >
> >
> >
> >Hi!
> >
> >First goes the abstract: despite all other parameters, the only setting
> >that seems
> >to make a difference for transaction handling is <isolation-level>. What
> >I really
> >want to make use of, is <concurrency-strategy>. Ultimately I want to make
> >use of
> >Optimistic concurrency strategy of WL70, but looks like that even
Exclusive
> >strategy
> >does not work in my case.
>
> Strategy must be supported by underlying DB and communicated to it via
driver. If
> it's either not supported, or driver can't tell DB what you want...
>
> >
> >Here is my description of my test app:
> >1. I have TxDataSource defined in Weblogic Console. Standard Datasource
> >seems not
> >to support transactions at all.
>
> That's for sure.
>
> >2. I have two instances of the Client -- C1 and C2, Session Bean -- S,
and
> >Entity
> >Bean -- E.
> >3. I start C1, it locates S and calls business method with Required
attribute
> >on
> >it.
> >4. Business method on S finds E using E.find(PK). All methods on E has
attribute
> >Mandatory.
> >5. Business method on S goes to sleep for 15 seconds:
Thread.sleep(15000).
> >I know
> >that in real-world applications one cannot use threads in EJB, but I have
> >to test
> >concurrent access to the same data from different clients and this was
the
> >easiest
> >way to do what I needed. Anyway, it is just a test.
> >6. While S is sleeping in business method, I start C2. It locates S
(creates
> >new
> >instance?), calls business method on it, which in turn, locates E (new
instance
> >of
> >E?), calls find() on it and goes to sleep for the same 15 seconds. Note,
> >that for
> ><concurrency-strategy>Exclusive</concurrency-strategy> I expected second
> >client to
> >be unable to find() Entity bean, because it should be locked by the first
> >client.
> >Quite opposite, it can be located by S. This is weird for me.
>
> It is not. It looks like you do have optimistic locking (Oracle uses it by
default,
> I do not know about Sybase). In such case any number of clients can try
to modify
> the data, they'll be happy ... till they try to commit.
>
> >7. Business method on S for the first client awakes and calls business
method
> >on
> >E (with Mandatory attribute). It changes data and commits. Fine.
> >8. Business method on S for the second client awakes and calls business
> >method on
> >E to change data. Then it exits, and - surprise! - commits data! Even in
>
> Yes, that sounds wrong at first. Though ... See: you can log into a DB and
execute
> update without prior locking. That is what happens. You edit stale data.
>
> To avoid this people use "version numbers", or whatever you want to call
it. This
> is a number, which has to be changed with each update and verified against
while
> modifying data in DB.
>
> >Exclusive
> >mode. The same thing in Optimistic mode with <verify-columns> parameter.
> >
> ><isolation-level> set to TRANSACTION_READ_COMMITTED, server is Sybase
Adaptive
> >Server
> >v.12.
> >
> >The record in database is not locked on find(), because I can UPDATE
record
> >using
> >Sybase SQL Advantage client.
> >
> >If I change <isolation-level> to TRANSACTION_REPEATABLE_READ or
TRANSACTION_SERIALIZABLE,
> >then record is locked at find(). But this does not have anyhting with
optimistic
> >locking! I want record to remain unlocked and to be checked for possible
>
> That does. By changing locking scheme you switch from optimistic to
pessimistic locking.
>
> >update by
> >other client during commit! Also, for Exclusive mode I suppose that I
cannot
> >even
> >find() entity bean for the same PK, that was already found by other
client.
> >What
> >am I doing wrong?
> >
> >Additional info is attached.
>
-
How to make use of the spare physical memory under buffered I/O of Essbase
We encountered an issue of the physical memory allocation of the server running Essbase with buffered I/O mode. We have implemented some cache setting in Essbase but still found that the disk I/O is quite high. Also we observed that Windows 2003 server cannot make use of the spare physical memory available as the system cache for database files of Essbase.
As allocating more memory as Essbase cache might not help, we would like to know other than changing to direct I/O mode, any other options can improve the disk I/O performance?
Thanks!Sandeep Reddy wrote:
Hi Hyperion_User,
1. Disk IO performance,It mighe depend on quite a few things , one of the aspects might be your storage system. It can depend on the disk configuration too ( i.e if your disk is SAN or NAS, then it depends on the configuration like Raid ..etc).
2. It depends on the HBA ( host bus adapter).
3. Let me try to explain with diagram.
http://www.c-sharpcorner.com/uploadfile/freebookarticles/apress/2008dec16010208am/DataStorageDesign/Images/159059214X-1404.1.gif
4. It might depend on the HBA and even on the switch speed.
5. Buffered IO is a very generic setting,which most of them use( that should not be an issue).
6. Even if you have 30 to 40 GB free memory, every application in essbase has a limitation to it maximum usage ( 2 GB on windows ). Refer to DBAG for more information on this .
Sandeep Reddy Enti
HCC
http://hyperionconsultancy.com/
Thanks for your detailed advice. I just wonder if more physical memory can help to improve the disk I/O being used for concurrent read/write access. We are using Windows 2003 Enterprise Edition and not sure whether some spare physical memory can be used for this purpose.
Thanks again! -
Sessionbeans cannot be used concurrently error? How to solve in EJB1.1?
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'''''''''bold text'''''''''
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So I have this iPhone 5S unlocked version from the US which I am using in India. When I am connected to my office wireless and also the cellular & 3G data are switched on, my phone goes out of service and I cannot make calls. I can also use internet.
However this works great when I get onto my home WiFi along with cellular & 3G data switched on, I can make calls and also surf the net with the WiFi.
Is anyone having similar issue? I am sure there is something with the office WiFi but what could it be to get my phone out of service.
Any thoughts anybody ?
Thanks,
UGYes I shutdown WiFi and I can connect to 3G on Cellular. I can make calls.
If I shutdown Cellular and connect WiFi. I can make calls.
Its just that when both are ON, then no calls can be made.
All combinations work good with Home WiFi.
-UG
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