在進行Spark與HBase 集成的過程中遇到以下問題：

java.lang.IllegalArgumentException: Error while instantiating ‘org.apache.spark.sql.hive.HiveSessionStateBuilder‘:
  at org.apache.spark.sql.SparkSession$.org$apache$spark$sql$SparkSession$$instantiateSessionState(SparkSession.scala:1053)
  at org.apache.spark.sql.SparkSession$$anonfun$sessionState$
 
2.apply(SparkSession.scala:130)
  at org.apache.spark.sql.SparkSession$$anonfun$sessionState$2.apply(SparkSession.scala:130)
  at scala.Option.getOrElse(Option.scala:121)
  at org.apache.spark.sql.SparkSession.sessionState$lzycompute(SparkSession.scala:129)
  at org.apache.spark.sql.SparkSession.sessionState(SparkSession.scala:
 
126)
  at org.apache.spark.sql.SparkSession$Builder$$anonfun$getOrCreate$5.apply(SparkSession.scala:938)
  at org.apache.spark.sql.SparkSession$Builder$$anonfun$getOrCreate$5.apply(SparkSession.scala:938)
  at scala.collection.mutable.HashMap$$anonfun$foreach$1.apply(HashMap.scala:99)
  at scala.collection.mutable.HashMap$$anonfun$
 
foreach$1.apply(HashMap.scala:99)
  at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:230)
  at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
  at scala.collection.mutable.HashMap.foreach(HashMap.scala:99)
  at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:938)
  at org.apache.spark.repl.Main$.createSparkSession(Main.scala:97)
  ... 47 elided
Caused by: java.lang.ClassNotFoundException: java.lang.NoClassDefFoundError: org/htrace/Trace when creating Hive client using classpath:......

Please make sure that jars for your version of hive and hadoop are included in the paths passed to spark.sql.hive.metastore.jars.
  at org.apache.spark.sql.hive.client.IsolatedClientLoader.createClient(IsolatedClientLoader.scala:270)
  at org.apache.spark.sql.hive.HiveUtils$.newClientForMetadata(HiveUtils.scala:362)
  at org.apache.spark.sql.hive.HiveUtils$.newClientForMetadata(HiveUtils.scala:266)
  at org.apache.spark.sql.hive.HiveExternalCatalog.client$lzycompute(HiveExternalCatalog.scala:66)
  at org.apache.spark.sql.hive.HiveExternalCatalog.client(HiveExternalCatalog.scala:65)
  at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$databaseExists$1.apply$mcZ$sp(HiveExternalCatalog.scala:194)
  at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$databaseExists$1.apply(HiveExternalCatalog.scala:194)
  at org.apache.spark.sql.hive.HiveExternalCatalog$$anonfun$databaseExists$1.apply(HiveExternalCatalog.scala:194)
  at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:97)
  at org.apache.spark.sql.hive.HiveExternalCatalog.databaseExists(HiveExternalCatalog.scala:193)
  at org.apache.spark.sql.internal.SharedState.externalCatalog$lzycompute(SharedState.scala:105)
  at org.apache.spark.sql.internal.SharedState.externalCatalog(SharedState.scala:93)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.externalCatalog(HiveSessionStateBuilder.scala:39)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog$lzycompute(HiveSessionStateBuilder.scala:54)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog(HiveSessionStateBuilder.scala:52)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog(HiveSessionStateBuilder.scala:35)
  at org.apache.spark.sql.internal.BaseSessionStateBuilder.build(BaseSessionStateBuilder.scala:289)
  at org.apache.spark.sql.SparkSession$.org$apache$spark$sql$SparkSession$$instantiateSessionState(SparkSession.scala:1050)
  ... 61 more
Caused by: java.lang.reflect.InvocationTargetException: java.lang.NoClassDefFoundError: org/htrace/Trace
  at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)
  at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:62)
  at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)
  at java.lang.reflect.Constructor.newInstance(Constructor.java:422)
  at org.apache.spark.sql.hive.client.IsolatedClientLoader.createClient(IsolatedClientLoader.scala:264)
  ... 78 more
Caused by: java.lang.NoClassDefFoundError: org/htrace/Trace
  at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:214)
  at com.sun.proxy.$Proxy17.getFileInfo(Unknown Source)
  at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.getFileInfo(ClientNamenodeProtocolTranslatorPB.java:752)
  at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
  at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
  at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
  at java.lang.reflect.Method.invoke(Method.java:497)
  at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:187)
  at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:102)
  at com.sun.proxy.$Proxy18.getFileInfo(Unknown Source)
  at org.apache.hadoop.hdfs.DFSClient.getFileInfo(DFSClient.java:1977)
  at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1118)
  at org.apache.hadoop.hdfs.DistributedFileSystem$18.doCall(DistributedFileSystem.java:1114)
  at org.apache.hadoop.fs.FileSystemLinkResolver.resolve(FileSystemLinkResolver.java:81)
  at org.apache.hadoop.hdfs.DistributedFileSystem.getFileStatus(DistributedFileSystem.java:1114)
  at org.apache.hadoop.fs.FileSystem.exists(FileSystem.java:1400)
  at org.apache.hadoop.hive.ql.session.SessionState.createRootHDFSDir(SessionState.java:596)
  at org.apache.hadoop.hive.ql.session.SessionState.createSessionDirs(SessionState.java:554)
  at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:508)
  at org.apache.spark.sql.hive.client.HiveClientImpl.<init>(HiveClientImpl.scala:191)
  ... 83 more
Caused by: java.lang.ClassNotFoundException: org.htrace.Trace
  at java.net.URLClassLoader.findClass(URLClassLoader.java:381)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:424)
  at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:331)
  at java.lang.ClassLoader.loadClass(ClassLoader.java:357)
  ... 103 more
<console>:14: error: not found: value spark
       import spark.implicits._
              ^
<console>:14: error: not found: value spark
       import spark.sql
              ^
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我事先已經將所需要的jar支持包全部拷貝到了各節點下的spark路徑下的jar目錄，但是在啟動bin/spark-shell時總是報以上錯誤。在網上也看來很多解決方法，比如將缺失的jar包 ：hbase/lib 下 hbase*.jar,metrics*.jar.htrace*.jar 等拷貝到spark/jar目錄，但這不正是我的啟動準備工作嗎，等於沒說！

從故障根源分析，造成此錯誤的原因在於Spark啟動的時候無法正常從我們的jar目錄加載到它所需要的jar包（此處表現為/htrace-core-3.0.4.jar包）。所以，直接將包添加到jar目錄是無法解決此問題的，而我們需要做的是給它指明CLASSPATH路徑，在它不能找到所需要的jar包時就可以從此路徑尋找。

解決辦法：

在spark/conf目錄下的spark-env.sh配置文件添加以下配置內容

export HBASE_CLASSPATH=‘hbase classpath‘
export HADOOP_CLASSPATH=‘hadoop classpath‘
export HADOOP_CLASSPATH=$HADOOP_CLASSPATH:$HBASE_CLASSPATH

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Spark-HBase集成錯誤之 java.lang.NoClassDefFoundError: org/htrace/Trace