上一文章中有具体描述到SessionState的几种模式的优点与缺点，现在我们挑一个持久性的SQLServer模式来做一个实例，让大家有个细节印象。
但是这种单纯使用SessionState的编程方式具有很多局限，比如Session Item的Key值冲突，比如没有一个有效的SessionState清除机制会为Web Server带来内存压力。 其次，统一的SessionState的清除机制的缺乏导致服务端内存压力。 最后将该Baz从SessionState中移除。 这个列表放在SessionState中。 如果运行时信息反映它还存在于SessionState中（Location=Session），则直接从SessionState中返回，并更新它的运行时信息（最后一次被访问时间）。
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java.lang.RuntimeException: java.io.IOException: Permission denied at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:570) at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java org.apache.hadoop.hive.common.FileUtils.createTempFile(FileUtils.java:798) at org.apache.hadoop.hive.ql.session.SessionState.createTempFile (SessionState.java:938) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java
<init>(SessionCatalog.scala:89) at org.apache.spark.sql.internal.SessionState.catalog$lzycompute( SessionState.scala:95) at org.apache.spark.sql.internal.SessionState.catalog(SessionState.scala:95 ) at org.apache.spark.sql.internal.SessionState$$anon$1. <init>(SessionState.scala:112) at org.apache.spark.sql.internal.SessionState.analyzer$lzycompute( SessionState.scala:112) at org.apache.spark.sql.internal.SessionState.analyzer(SessionState.scala
org.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient atorg.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:591) atorg.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java atorg.apache.hadoop.hive.ql.metadata.Hive.get(Hive.java:266) at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:558) ... 9 more Caused by:java.lang.RuntimeException: Unable to instantiateorg.apache.hadoop.hive.ql.metadata.SessionHiveMetaStoreClient
instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient 5 at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:371) 6 at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689) 7 org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2644) 19 at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:365) 20 ... 7 more 21 Caused by: java.lang.reflect.InvocationTargetException 22 (SessionState.java:365) 42 at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689) 43
2.需要修改ASP.NET web.config文件中的SessionState结点，该结点位于<system.web>下 <sessionState mode="SQLServer" allowCustomSqlDatabase password=;initial catalog=sd" cookieless="false" timeout="20"> </sessionState
details see: http://wiki.apache.org/hadoop/ConnectionRefused 5 at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:522) 6 at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:677) 7 org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1400) 39 at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir (SessionState.java:596) 40 at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java :554) 41 at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:508) 42 ..
<init>(Path.java:171) at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java :663) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:586) at org.apache.hadoop.hive.ql.session.SessionState.beginStart (SessionState.java:553) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:750) at org.apache.hadoop.hive.cli.CliDriver.main
若要禁用应用程序的会话状态，请在应用程序 Web.config 文件的 sessionstate 配置节中将 mode 属性设置为 off。 例如，<sessionstate mode="off" />。
使用 Attribute [SessionState(SessionStateBehavior.ReadOnly)] [SessionState(SessionStateBehavior.ReadOnly return Json(new { Code = 1, LoginId = Session["LoginId"] }); } } 只需要在Controller上加上特性SessionState
tracker = new QueryPlanningTracker val plan = tracker.measurePhase(QueryPlanningTracker.PARSING) { sessionState.sqlParser.parsePlan (sqlText) } Dataset.ofRows(self, plan, tracker)}sessionState.sqlParser.parsePlan(sqlText)sessionState.sqlParser SQLConf) extends ParserInterface with Logging { ...SparkSqlParser没有重写AbstractSqlParser的parsePlan方法，即sessionState.sqlParser.parsePlan
createDatabaseIfNotExist=true for mysql)) at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:578) at org.apache.hadoop.hive.ql.session.SessionState.beginStart(SessionState.java (SessionState.java:545) ... 9 more Caused by: org.apache.hadoop.hive.ql.metadata.HiveException: MetaException <init>(Path.java:172) at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java :631) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:550) at org.apache.hadoop.hive.ql.session.SessionState.beginStart
, date:new Date().getTime(), }) }, [sessionState]); const login = (user_data // 上下文 export const AppContext = createContext(undefined); function App() { const [login,logout,sessionState ..LoginState(), }) return( <BrowserRouter> <AppContext.Provider value={{login,logout,sessionState 不要忘记将值通过 <AppContext.Provider value={{login,logout,sessionState}}> 传递下去。 { // 使用前先获取上下文对象 const ct = useContext(AppContext); // 获取全局状态里的登录状态 const {isLogged} = ct.sessionState
sessionState节点的语法是这样的： <sessionState mode=”Off|InProc|StateServer|SQLServer” cookieless=”true|false” 打开刚才的SessionState.aspx页面，随便输入一些字符，使其存储在Session中。然后，让我们让IIS重起。 保存文件后的重新打开一个IE，打开SessionState.aspx页面，保存一些信息到Session中。 这时，让我们重起IIS，再回到SessionState.aspx页面中查看刚才的Session信息，发现没有丢失。 向SessionState.aspx中添加Session信息，这时发现Session信息已经存在SQL Server中了，即使你重起计算机，刚才的Session信息也不会丢失。
<clinit>(Hive.java:166) at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java (SessionState.java:371) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689) org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2644) at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:365) ... 7 more Caused by: java.lang.reflect.InvocationTargetException (SessionState.java:365) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:689)
org.apache.hadoop.hive.metastore.model.MResourceUri" is tagged as "embedded-only" so does not have its own datastore table. 15/12/24 20:46:36 INFO SessionState Created local directory: /tmp/1f162c4e-9707-467f-8adc-f8124c3e929a_resources 15/12/24 20:46:36 INFO SessionState HDFS directory: /tmp/hive/ndscbigdata/1f162c4e-9707-467f-8adc-f8124c3e929a 15/12/24 20:46:36 INFO SessionState Created local directory: /tmp/ndscbigdata/1f162c4e-9707-467f-8adc-f8124c3e929a 15/12/24 20:46:36 INFO SessionState
1、在WEB.CONFIG文件中修改SESSION状态保存模式，如：<sessionState mode='StateServer' stateConnectionString='tcpip=127.0.0.1 SessionState 的Timeout)，其主要原因有三种。 一：有些杀病毒软件会去扫描您的Web.Config文件，那时Session肯定掉，这是微软的说法。 原因： 由于Asp.net程序是默认配置，所以Web.Config文件中关于Session的设定如下： <sessionState mode='InProc' stateConnectionString 更多的信息请参考PRB: Session variables are lost intermittently in ASP.NET applications 解决办法： 前面说到的sessionState 同样还在sessionState标签中，有个stateConnectionString='tcpip=127.0.0.1:42424'属性，其中有个ip地址，默认为本机（127.0.0.1），你可以将其改成你所知的运行了
instantiate org.apache.hadoop.hive.metastore.HiveMetaStoreClient at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:346) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:681) org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2465) at org.apache.hadoop.hive.ql.session.SessionState.start (SessionState.java:340) ... 7 more Caused by: javax.jdo.JDOFatalDataStoreException: Unable to (SessionState.java:340) at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:681)
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