Hi Dilini,
On Thu, Jul 14, 2016 at 2:31 PM, Dilini Gunatilake <dili...@wso2.com> wrote: > Hi, > > @Thushara, > Thanks for the info. Any recommended number of max_connections to > configure considering indexing with a high load etc? Then we can add those > details in the docs to avoid future issues. > My personal recommendation, Increase the mysql active connections to 350. Please note that this is bounded to server specs. Now start 2 servers at a time. Wait 10 mins before starting the other 2 WSO2 servers. Or else you can always start 1 server at a time every 10 mins. Therefore it will take 30 mins to start all 4 nodes. Thanks, Thushara. > > @Sumedha, > I was able to start all the nodes because the number of connections > reduces after some time. > > As Rajith mentioned, the concern is having that number of connections > created just for a server startup having less than 25 assets. > > Thanks, > Dilini > > > On Thu, Jul 14, 2016 at 12:53 PM, Rajith Vitharana <raji...@wso2.com> > wrote: > >> Hi, >> >> On Thu, Jul 14, 2016 at 12:44 PM, Sumedha Rubasinghe <sume...@wso2.com> >> wrote: >> >>> Guys, >>> Some food for thought. >>> >>> 1. A single MySQL Server has a globally defined max_connections figure >>> (151 as Dilini mentioned) >>> >>> So on a clustered setup, when you point to a single MySQL Server from >>> various WSO2 products, depending on no of keep alive connections specified, >>> you will at some point will hit too many connections from server side @ >>> some point. >>> >> Yeah totally agree, but that much(395) is bit high AFAIU when just >> starting up a server(without any load in 4 servers, and when it stabilize, >> it only consumes less than 20 connections without load) >> >> @Thushara, Thanks for the info, will check what you have mentioned. >> >> Thanks, >> >>> >>> So you have to rethink the deployment and use a different database >>> server. >>> >>> 2. If ES has a tendency to perform too many database calls @ startup, >>> - You can temporally eliminate that by controlling node start up order >>> >>> >>> On Thu, Jul 14, 2016 at 12:04 PM, Rajith Vitharana <raji...@wso2.com> >>> wrote: >>> >>>> Hi, >>>> >>>> We faced the same issue in ESB latest when clustering enabled, with 4 >>>> node cluster, number of connections goes to around 395 and gradually comes >>>> down to 20 or less, even with the exception happened(mysql having default >>>> max connections 151), it seems it gets stable to 20 or less connections >>>> after some time. Created a public jira to track this issue at [1] >>>> >>>> [1] - https://wso2.org/jira/browse/REGISTRY-3771 >>>> >>>> Thanks, >>>> >>>> On Wed, Jul 13, 2016 at 4:42 PM, Dilini Gunatilake <dili...@wso2.com> >>>> wrote: >>>> >>>>> Hi All, >>>>> >>>>> I have set up a 4 node cluster for ES 2.1.0 Alpha2 pack with mysql >>>>> 5.7. When I started one store node I got an error [3]. >>>>> >>>>> Then, I checked the connections in the mysql server and found that the >>>>> default number of max_connections (151) have been exceeded while the store >>>>> node is starting. But initially without starting any ES instances there >>>>> were only around 20 connections. So, what we observed was when starting ES >>>>> instances substantially high amount of connections will be created and >>>>> they >>>>> will be gradually reduced after sometime. Is this an acceptable behavior? >>>>> >>>>> Also, we could find the recommended max_connections to configure in >>>>> some products [1][2], but couldn't find anything for ES. So, what is the >>>>> recommended value for ES? >>>>> For the time being we will increase the max connections to 300 and >>>>> proceed with testing. >>>>> >>>>> Your earliest response is highly appreciated. >>>>> >>>>> [1] https://docs.wso2.com/display/AM200/Tuning+Performance >>>>> [2] >>>>> https://docs.wso2.com/display/Governance510/Performance+Tuning+Recommendations >>>>> >>>>> [3] >>>>> >>>>> [2016-07-13 07:50:40,014] ERROR >>>>> {org.wso2.carbon.registry.core.dataaccess.TransactionManager} - Failed to >>>>> start new registry transaction. >>>>> com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: >>>>> Could not create connection to database server. Attempted reconnect 3 >>>>> times. Giving up. >>>>> at sun.reflect.GeneratedConstructorAccessor107.newInstance(Unknown >>>>> Source) >>>>> at >>>>> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) >>>>> at java.lang.reflect.Constructor.newInstance(Constructor.java:422) >>>>> at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) >>>>> at com.mysql.jdbc.Util.getInstance(Util.java:387) >>>>> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917) >>>>> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:896) >>>>> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:885) >>>>> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:860) >>>>> at >>>>> com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2165) >>>>> at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2090) >>>>> at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:795) >>>>> at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:44) >>>>> at sun.reflect.GeneratedConstructorAccessor76.newInstance(Unknown >>>>> Source) >>>>> at >>>>> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) >>>>> at java.lang.reflect.Constructor.newInstance(Constructor.java:422) >>>>> at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) >>>>> at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:400) >>>>> at >>>>> com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:327) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.PooledConnection.connectUsingDriver(PooledConnection.java:278) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.PooledConnection.connect(PooledConnection.java:182) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.ConnectionPool.createConnection(ConnectionPool.java:701) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.ConnectionPool.borrowConnection(ConnectionPool.java:635) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.ConnectionPool.getConnection(ConnectionPool.java:188) >>>>> at >>>>> org.apache.tomcat.jdbc.pool.DataSourceProxy.getConnection(DataSourceProxy.java:128) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.dataaccess.JDBCTransactionManager.beginTransaction(JDBCTransactionManager.java:80) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.EmbeddedRegistry.beginTransaction(EmbeddedRegistry.java:443) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.EmbeddedRegistry.get(EmbeddedRegistry.java:505) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.getInternal(UserRegistry.java:617) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.access$400(UserRegistry.java:61) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:597) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:594) >>>>> at java.security.AccessController.doPrivileged(Native Method) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.get(UserRegistry.java:594) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.handlers.builtin.MountHandler.get(MountHandler.java:399) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.handlers.HandlerManager.get(HandlerManager.java:2444) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.handlers.UserDefinedHandlerManager.get(UserDefinedHandlerManager.java:200) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.handlers.HandlerLifecycleManager.get(HandlerLifecycleManager.java:914) >>>>> at >>>>> org.wso2.carbon.registry.core.jdbc.EmbeddedRegistry.get(EmbeddedRegistry.java:512) >>>>> at >>>>> org.wso2.carbon.registry.core.caching.CacheBackedRegistry.get(CacheBackedRegistry.java:203) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.getInternal(UserRegistry.java:617) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.access$400(UserRegistry.java:61) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:597) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry$5.run(UserRegistry.java:594) >>>>> at java.security.AccessController.doPrivileged(Native Method) >>>>> at >>>>> org.wso2.carbon.registry.core.session.UserRegistry.get(UserRegistry.java:594) >>>>> at >>>>> org.wso2.carbon.registry.indexing.AsyncIndexer$IndexingTask.createIndexDocument(AsyncIndexer.java:242) >>>>> at >>>>> org.wso2.carbon.registry.indexing.AsyncIndexer$IndexingTask.run(AsyncIndexer.java:210) >>>>> at >>>>> java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511) >>>>> at java.util.concurrent.FutureTask.run(FutureTask.java:266) >>>>> at >>>>> java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142) >>>>> at >>>>> java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617) >>>>> at java.lang.Thread.run(Thread.java:745) >>>>> Caused by: >>>>> com.mysql.jdbc.exceptions.jdbc4.MySQLNonTransientConnectionException: Too >>>>> many connections >>>>> at sun.reflect.GeneratedConstructorAccessor107.newInstance(Unknown >>>>> Source) >>>>> at >>>>> sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45) >>>>> at java.lang.reflect.Constructor.newInstance(Constructor.java:422) >>>>> at com.mysql.jdbc.Util.handleNewInstance(Util.java:404) >>>>> at com.mysql.jdbc.Util.getInstance(Util.java:387) >>>>> at com.mysql.jdbc.SQLError.createSQLException(SQLError.java:917) >>>>> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3878) >>>>> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3814) >>>>> at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:871) >>>>> at >>>>> com.mysql.jdbc.MysqlIO.proceedHandshakeWithPluggableAuthentication(MysqlIO.java:1694) >>>>> at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:1215) >>>>> at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2255) >>>>> at >>>>> com.mysql.jdbc.ConnectionImpl.connectWithRetries(ConnectionImpl.java:2106) >>>>> ... 43 more >>>>> [2016-07-13 07:50:40,077] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/gadget/8c3eda76-ec7f-43e3-bbe8-efa14f85d780/images_thumbnail"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/gadget/8c3eda76-ec7f-43e3-bbe8-efa14f85d780/images_thumbnail >>>>> [2016-07-13 07:50:40,076] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path "/_system/governance/gadgets/admin/Stacked Line >>>>> Chart/1.0.0"could not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path /_system/governance/gadgets/admin/Stacked >>>>> Line Chart/1.0.0 >>>>> [2016-07-13 07:50:40,074] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/gadget/57235acc-ad87-41db-84e7-dadc0bcff8d5/images_banner"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/gadget/57235acc-ad87-41db-84e7-dadc0bcff8d5/images_banner >>>>> [2016-07-13 07:50:40,067] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/gadget/8c3eda76-ec7f-43e3-bbe8-efa14f85d780/images_banner"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/gadget/8c3eda76-ec7f-43e3-bbe8-efa14f85d780/images_banner >>>>> [2016-07-13 07:50:40,064] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path "/_system/governance/gadgets/admin/WSO2 Carbon Commits >>>>> List Discussion/1.0.0"could not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path /_system/governance/gadgets/admin/WSO2 >>>>> Carbon Commits List Discussion/1.0.0 >>>>> [2016-07-13 07:50:40,062] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/site/6b89dd21-0a98-4489-9f0d-fc327ff46bc0/images_thumbnail"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/site/6b89dd21-0a98-4489-9f0d-fc327ff46bc0/images_thumbnail >>>>> [2016-07-13 07:50:40,056] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/gadget/4c4f7877-ff39-4379-9ee4-6c1827732ec6/images_thumbnail"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/gadget/4c4f7877-ff39-4379-9ee4-6c1827732ec6/images_thumbnail >>>>> [2016-07-13 07:50:40,079] ERROR >>>>> {org.wso2.carbon.registry.indexing.AsyncIndexer} - Error while indexing. >>>>> Resource at path >>>>> "/_system/governance/store/asset_resources/gadget/57235acc-ad87-41db-84e7-dadc0bcff8d5/images_thumbnail"could >>>>> not be >>>>> indexedorg.wso2.carbon.registry.core.exceptions.ResourceNotFoundException: >>>>> Resource does not exist at path >>>>> /_system/governance/store/asset_resources/gadget/57235acc-ad87-41db-84e7-dadc0bcff8d5/images_thumbnail >>>>> >>>>> >>>>> Thank you. >>>>> Regards, >>>>> >>>>> -- >>>>> >>>>> *Dilini GunatilakeSoftware Engineer - QA Team* >>>>> Mobile : +94 (0) 771 162518 >>>>> dili...@wso2.com >>>>> >>>>> _______________________________________________ >>>>> Dev mailing list >>>>> Dev@wso2.org >>>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>>> >>>>> >>>> >>>> >>>> -- >>>> Rajith Vitharana >>>> >>>> Software Engineer, >>>> WSO2 Inc. : wso2.com >>>> Mobile : +94715883223 >>>> Blog : http://lankavitharana.blogspot.com/ >>>> >>>> _______________________________________________ >>>> Dev mailing list >>>> Dev@wso2.org >>>> http://wso2.org/cgi-bin/mailman/listinfo/dev >>>> >>>> >>> >>> >>> -- >>> /sumedha >>> m: +94 773017743 >>> b : bit.ly/sumedha >>> >> >> >> >> -- >> Rajith Vitharana >> >> Software Engineer, >> WSO2 Inc. : wso2.com >> Mobile : +94715883223 >> Blog : http://lankavitharana.blogspot.com/ >> > > > > -- > > *Dilini GunatilakeSoftware Engineer - QA Team* > Mobile : +94771162518 > dili...@wso2.com > > > _______________________________________________ > Dev mailing list > Dev@wso2.org > http://wso2.org/cgi-bin/mailman/listinfo/dev > > -- Thanks, Thushara Kasun Ranawaka Software Engineer WSO2 Inc.; <http://www.wso2.com> lean.enterprise.middleware Mobile : *+94 (0) 773438949 <%2B94%20%280%29%20773438949>* *thusha...@wso2.com <thusha...@wso2.com>*
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