JDBC Blocks again when try to get new connections.
Hi,
again, my tomcat freezes today, and i must stop/start tomcat to get new connections:
i checked MaxDB server and a Running thread causes Timer to block.
the output of command show t_cnt of the running maxdb thread is:
-------------------- T270 USER ( pid = 0 ) ---------------
remote_node : 192.168.99.1 remote_pid : 0
dispatcher_cnt: 618065 command_cnt : 99418
exclusive_cnt : 1035660104 self_susp_cnt : 4
Resume count 0 total 155 History [ T2 T2 T2 ]
dev_read_io : 177 dev_read_pg : 177
state_vwait : 0 state_vsleep : 45 state_vsusp : 144
rcv_rpl_count : 99418 rcv_rpl_long : 0 avg_rcv_rpl_t : 0.0000
dev_que_len_0 : 177 dev_que_len_1 : 0 dev_que_len>1 : 0
prio_total : 2 prio_from_oth : 2
some of the java blocked thread example is:
"http-80-173" daemon prio=10 tid=0x0000000043edd000 nid=0x7ce8 waiting for monitor entry [0x000000005564c000..0x000000005564da90]
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:917)
- waiting to lock <0x00002aaab91895b0> (a org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.exolab.castor.jdo.engine.DatabaseRegistry.createConnection(DatabaseRegistry.java:399)
at org.exolab.castor.jdo.engine.TransactionContextImpl.getConnection(TransactionContextImpl.java:203)
at org.exolab.castor.persist.TransactionContext.query(TransactionContext.java:644)
- locked <0x00002aab12f5a5d8> (a org.exolab.castor.jdo.engine.TransactionContextImpl)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:458)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:414)
at com.supridatta.bean.DataPersist.consulta(DataPersist.java:536)
at com.supridatta.servlet.SupridattaServlet.doConsultarControl(SupridattaServlet.java:730)
at com.supridatta.servlet.SupridattaServlet$9.resolve(SupridattaServlet.java:294)
at com.supridatta.servlet.SupridattaServlet.processaOperacao(SupridattaServlet.java:144)
at com.supridatta.servlet.SupridattaServlet.doAppletControl(SupridattaServlet.java:114)
at com.supridatta.servlet.SupridattaServlet.service(SupridattaServlet.java:1747)
at javax.servlet.http.HttpServlet.service(HttpServlet.java:717)
at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290)
at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206)
at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233)
at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:183)
at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:128)
at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102)
at org.apache.catalina.valves.AccessLogValve.invoke(AccessLogValve.java:568)
at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109)
like this exists about 189 java blocked threads all waiting for this one:
"Timer-4" daemon prio=10 tid=0x0000000043ae7000 nid=0x51b3 runnable [0x0000000042128000..0x0000000042128b10]
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.sap.dbtech.rte.comm.BasicSocketComm.receiveData(BasicSocketComm.java:577)
at com.sap.dbtech.rte.comm.BasicSocketComm.receive(BasicSocketComm.java:666)
at com.sap.dbtech.rte.comm.JdbcCommunication.execute(JdbcCommunication.java:41)
at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:536)
- locked <0x00002aaabce3bc80> (a com.sap.dbtech.jdbc.ConnectionSapDB)
at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:461)
at com.sap.dbtech.jdbc.ConnectionSapDB.isClosed(ConnectionSapDB.java:746)
at com.sap.dbtech.jdbc.trace.Connection.isClosed(Connection.java:400)
at org.apache.tomcat.dbcp.dbcp.DelegatingConnection.isClosed(DelegatingConnection.java:346)
at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateConnection(PoolableConnectionFactory.java:324)
at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.validateObject(PoolableConnectionFactory.java:312)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.evict(GenericObjectPool.java:1217)
- locked <0x00002aaab91895b0> (a org.apache.tomcat.dbcp.pool.impl.GenericObjectPool)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool$Evictor.run(GenericObjectPool.java:1341)
at java.util.TimerThread.mainLoop(Timer.java:512)
at java.util.TimerThread.run(Timer.java:462)
Locked ownable synchronizers:
- None
then seeing all this appears that com.sap.dbtech.jdbc.ConnectionSapDB.isClosed(ConnectionSapDB.java:746) do something that blocks all connections, but i cant understand if T270 is related to this Timer-4 java thread.
any idea?
Hi Lars,
I updated all things, Java, Linux, MaxDB, i discovered that the problem isnt with network, but with some kind of deadlock at database side, for example:
1) user 1 insert something on table A
2) user 2 starts a long running transaction with poor SQL statement that locks the table A.
3) user 3 opens a connection to run an SQL statement that queries table A.
4) all java threads that need a new JDBC connection get blocked because step 3 never returns a new connection, and DBCP synchronization never goes out.
here is the thread of step 2:
java.lang.Thread.State: RUNNABLE
at java.net.SocketInputStream.socketRead0(Native Method)
at java.net.SocketInputStream.read(SocketInputStream.java:129)
at com.sap.dbtech.rte.comm.BasicSocketComm.receiveData(BasicSocketComm.java:577)
at com.sap.dbtech.rte.comm.BasicSocketComm.receive(BasicSocketComm.java:666)
at com.sap.dbtech.rte.comm.JdbcCommunication.execute(JdbcCommunication.java:41)
at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:536)
- locked <0x00002aab1ed9d560> (a com.sap.dbtech.jdbc.ConnectionSapDB)
at com.sap.dbtech.jdbc.ConnectionSapDB.execute(ConnectionSapDB.java:461)
at com.sap.dbtech.jdbc.ConnectionSapDB.doConnect(ConnectionSapDB.java:398)
at com.sap.dbtech.jdbc.ConnectionSapDB.<init>(ConnectionSapDB.java:109)
at com.sap.dbtech.jdbc.DriverSapDB.connect(DriverSapDB.java:222)
- locked <0x00002aaabc74ade0> (a com.sap.dbtech.jdbc.DriverSapDB)
at org.apache.tomcat.dbcp.dbcp.DriverConnectionFactory.createConnection(DriverConnectionFactory.java:38)
at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
- locked <0x00002aaabc896988> (a org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:974)
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.exolab.castor.jdo.engine.DatabaseRegistry.createConnection(DatabaseRegistry.java:399)
at org.exolab.castor.jdo.engine.TransactionContextImpl.getConnection(TransactionContextImpl.java:203)
at org.exolab.castor.persist.TransactionContext.query(TransactionContext.java:644)
- locked <0x00002aab1e8d9348> (a org.exolab.castor.jdo.engine.TransactionContextImpl)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:458)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:414)
at com.supridatta.bean.DataPersist.consulta(DataPersist.java:536)
and here is the thread at step 3:
java.lang.Thread.State: BLOCKED (on object monitor)
at org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory.makeObject(PoolableConnectionFactory.java:294)
- waiting to lock <0x00002aaabc896988> (a org.apache.tomcat.dbcp.dbcp.PoolableConnectionFactory)
at org.apache.tomcat.dbcp.pool.impl.GenericObjectPool.borrowObject(GenericObjectPool.java:974)
at org.apache.tomcat.dbcp.dbcp.PoolingDataSource.getConnection(PoolingDataSource.java:96)
at org.apache.tomcat.dbcp.dbcp.BasicDataSource.getConnection(BasicDataSource.java:880)
at org.exolab.castor.jdo.engine.DatabaseRegistry.createConnection(DatabaseRegistry.java:399)
at org.exolab.castor.jdo.engine.TransactionContextImpl.getConnection(TransactionContextImpl.java:203)
at org.exolab.castor.persist.TransactionContext.query(TransactionContext.java:644)
- locked <0x00002aab1e898f98> (a org.exolab.castor.jdo.engine.TransactionContextImpl)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:458)
at org.exolab.castor.jdo.engine.OQLQueryImpl.execute(OQLQueryImpl.java:414)
at com.supridatta.bean.DataPersist.consulta(DataPersist.java:536)
I inspected the database side, still really running, database results comes, but without releasing the connection, and if i wait the time or no user need a new connection, i never get thread blockeds, appears that MaxDB locks all connections if the newly created connection executes some SQL after acquiring that connection.
I see some blocks too at java finalizer, where one thread running is stucked getting a connection.
all this is just guess, maybe I'm wrong, but for now i will end this thread as we need see how this system will perform with all updates made.
best regards.
Clóvis
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"ATTRIB_23" NUMBER(22,7),
"ATTRIB_24" NUMBER(22,7),
"ATTRIB_25" NUMBER(22,7),
"ATTRIB_26" DATE,
"ATTRIB_27" DATE,
"ATTRIB_28" DATE,
"ATTRIB_29" DATE,
"ATTRIB_30" DATE,
"ATTRIB_31" DATE,
"ATTRIB_32" DATE,
"ATTRIB_33" DATE,
"ATTRIB_01" VARCHAR2(100 CHAR),
"ATTRIB_02" VARCHAR2(100 CHAR),
"ATTRIB_03" VARCHAR2(30 CHAR),
"ATTRIB_04" VARCHAR2(30 CHAR),
"ATTRIB_05" VARCHAR2(30 CHAR),
"ATTRIB_06" VARCHAR2(30 CHAR),
"ATTRIB_07" VARCHAR2(30 CHAR),
"ATTRIB_34" VARCHAR2(50 CHAR),
"ATTRIB_35" VARCHAR2(50 CHAR),
"ATTRIB_36" VARCHAR2(50 CHAR),
"ATTRIB_37" VARCHAR2(50 CHAR),
"ATTRIB_38" VARCHAR2(50 CHAR),
"ATTRIB_39" VARCHAR2(50 CHAR),
"ATTRIB_40" VARCHAR2(50 CHAR),
"ATTRIB_41" VARCHAR2(50 CHAR),
"ATTRIB_42" VARCHAR2(50 CHAR),
"ATTRIB_43" VARCHAR2(50 CHAR),
"ATTRIB_44" VARCHAR2(100 CHAR),
"ATTRIB_45" VARCHAR2(100 CHAR),
"ATTRIB_46" VARCHAR2(100 CHAR),
"ATTRIB_47" VARCHAR2(255 CHAR),
"X_MERCHANDISE_NAME" LONG
) PCTFREE 10 PCTUSED 40 INITRANS 1 MAXTRANS 255 NOCOMPRESS LOGGING
STORAGE(INITIAL 81920 NEXT 1048576 MINEXTENTS 1 MAXEXTENTS 2147483645
PCTINCREASE 0 FREELISTS 1 FREELIST GROUPS 1 BUFFER_POOL DEFAULT)
TABLESPACE "SIEBEL" ;
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