Sailaja Polavarapu created RANGER-3659:
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             Summary: Ranger Admin goes to OOM when usersync is trying to 
delete existing group mappings from ranger DB
                 Key: RANGER-3659
                 URL: https://issues.apache.org/jira/browse/RANGER-3659
             Project: Ranger
          Issue Type: Improvement
          Components: Ranger
            Reporter: Sailaja Polavarapu


Ranger Admin goes to OOM when usersync is trying to delete existing group 
mappings from ranger DB. 

>From heapdump the thread that is running OOM:
{code:java}
https-jsse-nio-6182-exec-3
at java.lang.OutOfMemoryError.<init>()V (OutOfMemoryError.java:48)
at java.util.IdentityHashMap.resize(I)Z (IdentityHashMap.java:472)
at 
java.util.IdentityHashMap.put(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;
 (IdentityHashMap.java:441)
at 
org.eclipse.persistence.internal.sessions.UnitOfWorkImpl.calculateChanges(Ljava/util/Map;Lorg/eclipse/persistence/internal/sessions/UnitOfWorkChangeSet;ZZ)Lorg/eclipse/persistence/internal/sessions/UnitOfWorkChangeSet;
 (UnitOfWorkImpl.java:731)
at 
org.eclipse.persistence.internal.sessions.RepeatableWriteUnitOfWork.writeChanges()V
 (RepeatableWriteUnitOfWork.java:443)
at org.eclipse.persistence.internal.jpa.EntityManagerImpl.flush()V 
(EntityManagerImpl.java:975)
at org.eclipse.persistence.internal.jpa.QueryImpl.performPreQueryFlush()V 
(QueryImpl.java:976)
at 
org.eclipse.persistence.internal.jpa.QueryImpl.executeReadQuery()Ljava/lang/Object;
 (QueryImpl.java:211)
at 
org.eclipse.persistence.internal.jpa.QueryImpl.getSingleResult()Ljava/lang/Object;
 (QueryImpl.java:530)
at 
org.eclipse.persistence.internal.jpa.EJBQueryImpl.getSingleResult()Ljava/lang/Object;
 (EJBQueryImpl.java:404)
at 
org.apache.ranger.db.XXUserDao.findByUserName(Ljava/lang/String;)Lorg/apache/ranger/entity/XXUser;
 (XXUserDao.java:52)
at 
org.apache.ranger.service.XUserService.getXUserByUserName(Ljava/lang/String;)Lorg/apache/ranger/view/VXUser;
 (XUserService.java:150)
at 
org.apache.ranger.biz.XUserMgr.deleteXGroupAndXUser(Ljava/lang/String;Ljava/lang/String;)V
 (XUserMgr.java:855)
at 
org.apache.ranger.biz.XUserMgr.createOrDeleteXGroupUsers(Lorg/apache/ranger/ugsyncutil/model/GroupUserInfo;Ljava/util/Map;)V
 (XUserMgr.java:2835)
at 
org.apache.ranger.biz.XUserMgr.createOrDeleteXGroupUserList(Ljava/util/List;)I 
(XUserMgr.java:2860)
at 
org.apache.ranger.biz.XUserMgr$$FastClassBySpringCGLIB$$57c6d473.invoke(ILjava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
 (Unknown Source)
at 
org.springframework.cglib.proxy.MethodProxy.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
 (MethodProxy.java:204)
at 
org.springframework.aop.framework.CglibAopProxy$DynamicAdvisedInterceptor.intercept(Ljava/lang/Object;Ljava/lang/reflect/Method;[Ljava/lang/Object;Lorg/springframework/cglib/proxy/MethodProxy;)Ljava/lang/Object;
 (CglibAopProxy.java:668)
at 
org.apache.ranger.biz.XUserMgr$$EnhancerBySpringCGLIB$$b2c8ac3b.createOrDeleteXGroupUserList(Ljava/util/List;)I
 (Unknown Source)
at 
org.apache.ranger.rest.XUserREST.addOrUpdateGroupUsersList(Ljava/util/List;)I 
(XUserREST.java:1464)
at 
org.apache.ranger.rest.XUserREST$$FastClassBySpringCGLIB$$b2a65360.invoke(ILjava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
 (Unknown Source)
at 
org.springframework.cglib.proxy.MethodProxy.invoke(Ljava/lang/Object;[Ljava/lang/Object;)Ljava/lang/Object;
 (MethodProxy.java:204)
at 
org.springframework.aop.framework.CglibAopProxy$CglibMethodInvocation.invokeJoinpoint()Ljava/lang/Object;
 (CglibAopProxy.java:737){code}



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