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From Marcus Sorensen <shadow...@gmail.com>
Subject Re: database connection resilience
Date Sun, 07 Jul 2013 06:45:57 GMT
I see that my db.properties has db.cloud.autoReconnect=true, which
translates to setting autoReconnect in the jdbc driver connection in
utils/src/com/cloud/utils/db/Transaction.java. I also see that if I
manually trigger the issue I get:

013-07-07 00:42:50,502 ERROR [cloud.cluster.ClusterManagerImpl]
(Cluster-Heartbeat-1:null) Runtime DB exception
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException:
Communications link failure

The last packet successfully received from the server was 1,503
milliseconds ago.  The last packet sent successfully to the server was
0 milliseconds ago.
at sun.reflect.GeneratedConstructorAccessor159.newInstance(Unknown Source)
at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
at java.lang.reflect.Constructor.newInstance(Constructor.java:532)
at com.mysql.jdbc.Util.handleNewInstance(Util.java:411)
at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1117)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3567)
at com.mysql.jdbc.MysqlIO.reuseAndReadPacket(MysqlIO.java:3456)
at com.mysql.jdbc.MysqlIO.checkErrorPacket(MysqlIO.java:3997)
at com.mysql.jdbc.MysqlIO.sendCommand(MysqlIO.java:2468)
at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2629)
at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2719)
at com.mysql.jdbc.PreparedStatement.executeInternal(PreparedStatement.java:2155)
at com.mysql.jdbc.PreparedStatement.executeQuery(PreparedStatement.java:2318)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
at org.apache.commons.dbcp.DelegatingPreparedStatement.executeQuery(DelegatingPreparedStatement.java:96)
at com.cloud.utils.db.GenericDaoBase.searchIncludingRemoved(GenericDaoBase.java:409)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at com.cloud.utils.db.GenericDaoBase.searchIncludingRemoved(GenericDaoBase.java:350)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at com.cloud.utils.db.GenericDaoBase.listIncludingRemovedBy(GenericDaoBase.java:907)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at com.cloud.utils.db.GenericDaoBase.listIncludingRemovedBy(GenericDaoBase.java:912)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at com.cloud.cluster.dao.ManagementServerHostDaoImpl.getActiveList(ManagementServerHostDaoImpl.java:158)
at com.cloud.utils.component.ComponentInstantiationPostProcessor$InterceptorDispatcher.intercept(ComponentInstantiationPostProcessor.java:125)
at com.cloud.cluster.ClusterManagerImpl.peerScan(ClusterManagerImpl.java:1057)
at com.cloud.cluster.ClusterManagerImpl.access$1200(ClusterManagerImpl.java:95)
at com.cloud.cluster.ClusterManagerImpl$4.run(ClusterManagerImpl.java:789)
at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
at java.util.concurrent.FutureTask$Sync.innerRunAndReset(FutureTask.java:351)
at java.util.concurrent.FutureTask.runAndReset(FutureTask.java:178)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.access$201(ScheduledThreadPoolExecutor.java:165)
at java.util.concurrent.ScheduledThreadPoolExecutor$ScheduledFutureTask.run(ScheduledThreadPoolExecutor.java:267)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:679)
Caused by: java.io.EOFException: Can not read response from server.
Expected to read 4 bytes, read 0 bytes before connection was
unexpectedly lost.
... 55 more
2013-07-07 00:42:50,505 ERROR [cloud.cluster.ClusterManagerImpl]
(Cluster-Heartbeat-1:null) DB communication problem detected, fence it

And I have only to restart cloudstack-management so it can connect to
another member in the loadbalanced multimaster database to get things
running again.


On Sun, Jul 7, 2013 at 12:35 AM, Marcus Sorensen <shadowsor@gmail.com> wrote:
> I've noticed that the cloudstack management server creates persistent
> connections to the database, and crashes if the database connection is
> lost. I haven't looked at the code yet, but I was wondering if anyone
> knew about what was going on here, if it's simply not set up to
> gracefully handle reconnect, or something else.  We have a
> multi-master database setup, but cloudstack doesn't take advantage of
> it since it doesn't attempt graceful reconnect, if the particular node
> it connected to on startup goes down, it simply crashes.

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