(FAQ)因消息中心实模式在高峰大并发场景下导致宕机，EAS Cloud实例陆续停止

(FAQ)因消息中心实模式在高峰大并发场景下导致宕机，EAS Cloud实例陆续停止
原因分析： 1、从反馈的日志分析，server4、server6等实例陆续OOM有heapdump产生。判断某些功能操作导致宕机。 2、分析heapdump和javacore日志，初步定位和消息中心加载量过多相关。数据库过滤45万多的结果集时导致OOM。 3、客户环境是EAS6.0SP1，消息中心模块开发分析了客户消息中心相关jar包，判断刷新机制没有问题。判断可能是45个左右有一万条以上消息的人同时操作，造成宕机。 4、和客户沟通过，反馈是在结账期间，使用工作流消息中心的人很多。进一步验证了判断。（已和客户沟通，后续再咨询当时的客户端，以进一步确认问题） 相关日志： Heapdump： Javacore： "RPC-22" (TID:0x000000012651D700, sys_thread_t:0x000000011AB4F3F8, state:CW, native ID:0x00000000000DC04F) prio=5 at com/kingdee/util/SortedStringObjectMap$EntrySet.iterator(SortedStringObjectMap.java:524(Compiled Code)) at com/kingdee/bos/dao/xml/impl/MapStateManager.equalsValue(MapStateManager.java:316(Compiled Code)) at com/kingdee/bos/dao/xml/impl/MapStateManager.equals(MapStateManager.java:311(Compiled Code)) at com/kingdee/bos/dao/xml/impl/AbstractMDValue.equals(AbstractMDValue.java:521(Compiled Code)) at com/kingdee/bos/metadata/query/PropertyRefInfo.showValue(PropertyRefInfo.java:315(Compiled Code)) at com/kingdee/bos/metadata/query/PropertyRefInfo.showValue(PropertyRefInfo.java:360(Compiled Code)) at com/kingdee/bos/metadata/query/token/ObjectValueToken.showValue(ObjectValueToken.java:74(Compiled Code)) at com/kingdee/bos/metadata/query/token/TokenList.showValue(TokenList.java:80(Compiled Code)) at com/kingdee/bos/metadata/query/token/TokenList.showValue(TokenList.java:76(Compiled Code)) at com/kingdee/bos/metadata/query/util/QueryUtil.getUnitString(QueryUtil.java:1757(Compiled Code)) at com/kingdee/bos/metadata/query/util/QuerySqlAccessBase.buildSelect(QuerySqlAccessBase.java:1017(Compiled Code)) at com/kingdee/bos/metadata/query/util/QuerySqlAccessBase.getSql(QuerySqlAccessBase.java:274(Compiled Code)) at com/kingdee/bos/dao/query/server/BaseDataAccess.getRuntimeSql(BaseDataAccess.java:356(Compiled Code)) at com/kingdee/bos/dao/query/server/BaseDataAccess.getRuntimeSql(BaseDataAccess.java:250(Compiled Code)) at com/kingdee/bos/dao/query/server/BaseDataAccess.getRuntimeSql(BaseDataAccess.java:204(Compiled Code)) at com/kingdee/bos/dao/query/server/BaseDataAccess.getRuntimeSql(BaseDataAccess.java(Compiled Code)) at com/kingdee/bos/dao/query/server/QueryDataAccess.innerGetRowSet(QueryDataAccess.java:1481(Compiled Code)) at com/kingdee/bos/dao/query/server/QueryDataAccess.getRowSet(QueryDataAccess.java:1387(Compiled Code)) at sun/reflect/GeneratedMethodAccessor106.invoke(Bytecode PC:230(Compiled Code)) at sun/reflect/DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43(Compiled Code)) at java/lang/reflect/Method.invoke(Method.java:603(Compiled Code)) at com/kingdee/bos/ResponseInvocationHandler.invoke(ResponseInvocationHandler.java:188(Compiled Code)) at $Proxy155.getRowSet(Bytecode PC:48(Compiled Code)) at com/kingdee/bos/dao/query/QueryExecutor.executeQueryByPK(QueryExecutor.java:210(Compiled Code)) at com/kingdee/bos/dao/query/QueryExecutor.executeQuery(QueryExecutor.java:180(Compiled Code)) at com/kingdee/eas/base/message/app/MessageCenterUIHandler._tableRequestData(MessageCenterUIHandler.java:248(Compiled Code)) at com/kingdee/eas/framework/app/ListUIHandler.tableRequestData(ListUIHandler.java:356(Compiled Code)) at com/kingdee/eas/base/message/app/MessageCenterUIHandler._handleActionRefresh(MessageCenterUIHan