Number of reduce tasks is set to 0 since there's no reduce operator
java.net.UnknownHostException: backup.server: backup.server
at java.net.InetAddress.getLocalHost(InetAddress.java:1496)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:1000)
at org.apache.hadoop.mapred.JobClient$2.run(JobClient.java:976)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Subject.java:415)
at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1438)
at org.apache.hadoop.mapred.JobClient.submitJobInternal(JobClient.java:976)
at org.apache.hadoop.mapred.JobClient.submitJob(JobClient.java:950)
at org.apache.hadoop.hive.ql.exec.ExecDriver.execute(ExecDriver.java:448)
at org.apache.hadoop.hive.ql.exec.MapRedTask.execute(MapRedTask.java:138)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:138)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:66)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1383)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1169)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:982)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:902)
at org.apache.hadoop.hive.cli.CliDriver.processLocalCmd(CliDriver.java:259)
at org.apache.hadoop.hive.cli.CliDriver.processCmd(CliDriver.java:216)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:412)
at org.apache.hadoop.hive.cli.CliDriver.run(CliDriver.java:759)
at org.apache.hadoop.hive.cli.CliDriver.main(CliDriver.java:613)
at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:57)
at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
at java.lang.reflect.Method.invoke(Method.java:606)
at org.apache.hadoop.util.RunJar.main(RunJar.java:208)
Caused by: java.net.UnknownHostException: backup.server
at java.net.Inet4AddressImpl.lookupAllHostAddr(Native Method)
at java.net.InetAddress$1.lookupAllHostAddr(InetAddress.java:922)
at java.net.InetAddress.getAddressesFromNameService(InetAddress.java:1316)
at java.net.InetAddress.getLocalHost(InetAddress.java:1492)
... 25 more
Job Submission failed with exception 'java.net.UnknownHostException(backup.server: backup.server)'
以上报错，vi /etc/sysconfig/network host需要和/etc/hosts一样。
有的报错
缺少MYSQL的mysql-connector-java-5.x.xxx.jar，
安装过程中可能出现的问题及解决
1.CREATE TABLE src(key INT, value STRING);
FAILED: Error in metadata: MetaException(message:Got exception: org.apache.hadoop.ipc.RPC$VersionMismatch Protocol org.apache.hadoop.hdfs.protocol.ClientProtocol version
mismatch. (client = 61, server = 63))
FAILED: Execution Error, return code 1 from org.apache.hadoop.hive.ql.exec.DDLTask
ERROR exec.Task: FAILED: Error in metadata: MetaException(message:Got exception: org.apache.hadoop.ipc.RPC$VersionMismatch Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 61, server = 63))
org.apache.hadoop.hive.ql.metadata.HiveException: MetaException(message:Got exception: org.apache.hadoop.ipc.RPC$VersionMismatch Protocol
org.apache.hadoop.hdfs.protocol.ClientProtocol version mismatch. (client = 61, server = 63))
at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:544)
at org.apache.hadoop.hive.ql.exec.DDLTask.createTable(DDLTask.java:3313)
at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:242)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:134)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1312)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1104)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:937)
at shark.SharkCliDriver.processCmd(SharkCliDriver.scala:288)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:406)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:341)
at shark.SharkCliDriver$.main(SharkCliDriver.scala:203)
at shark.SharkCliDriver.main(SharkCliDriver.scala)
reason：Hadoop版本与SHARK的Hadoop core jar包版本不一致引起的。
解决：将${HADOOP_HOME}/hadoop-core-*.jar copy 到${SHARK_HOME}/lib_managed/jars/org.apache.hadoop/hadoop-core/目录下面，rm原来的 hadoop-core-*.jar
重新进入Shark
2.出现java.lang.NoClassDefFoundError
/app/hadoop/shark/shark-0.7.0/lib_managed/jars/org.apache.hadoop/hadoop-core/
java.lang.NoClassDefFoundError: org/apache/hadoop/thirdparty/guava/common/collect/LinkedListMultimap
at org.apache.hadoop.hdfs.SocketCache.<init>(SocketCache.java:48)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:253)
at org.apache.hadoop.hdfs.DFSClient.<init>(DFSClient.java:220)
at org.apache.hadoop.hdfs.DistributedFileSystem.initialize(DistributedFileSystem.java:89)
at org.apache.hadoop.fs.FileSystem.createFileSystem(FileSystem.java:1611)
at org.apache.hadoop.fs.FileSystem.access$300(FileSystem.java:68)
at org.apache.hadoop.fs.FileSystem$Cache.getInternal(FileSystem.java:1645)
at org.apache.hadoop.fs.FileSystem$Cache.get(FileSystem.java:1627)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:254)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:123)
at org.apache.hadoop.fs.FileSystem.get(FileSystem.java:238)
at org.apache.hadoop.fs.Path.getFileSystem(Path.java:183)
at org.apache.hadoop.hive.metastore.Warehouse.getFs(Warehouse.java:104)
at org.apache.hadoop.hive.metastore.Warehouse.getDnsPath(Warehouse.java:136)
at org.apache.hadoop.hive.metastore.Warehouse.getWhRoot(Warehouse.java:151)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.getDefaultDatabasePath(HiveMetaStore.java:475)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB_core(HiveMetaStore.java:353)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.createDefaultDB(HiveMetaStore.java:371)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.init(HiveMetaStore.java:278)
at org.apache.hadoop.hive.metastore.HiveMetaStore$HMSHandler.<init>(HiveMetaStore.java:248)
at org.apache.hadoop.hive.metastore.HiveMetaStoreClient.<init>(HiveMetaStoreClient.java:114)
at org.apache.hadoop.hive.ql.metadata.Hive.createMetaStoreClient(Hive.java:2092)
at org.apache.hadoop.hive.ql.metadata.Hive.getMSC(Hive.java:2102)
at org.apache.hadoop.hive.ql.metadata.Hive.createTable(Hive.java:538)
at org.apache.hadoop.hive.ql.exec.DDLTask.createTable(DDLTask.java:3313)
at org.apache.hadoop.hive.ql.exec.DDLTask.execute(DDLTask.java:242)
at org.apache.hadoop.hive.ql.exec.Task.executeTask(Task.java:134)
at org.apache.hadoop.hive.ql.exec.TaskRunner.runSequential(TaskRunner.java:57)
at org.apache.hadoop.hive.ql.Driver.launchTask(Driver.java:1312)
at org.apache.hadoop.hive.ql.Driver.execute(Driver.java:1104)
at org.apache.hadoop.hive.ql.Driver.run(Driver.java:937)
at shark.SharkCliDriver.processCmd(SharkCliDriver.scala:288)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:406)
at org.apache.hadoop.hive.cli.CliDriver.processLine(CliDriver.java:341)
at shark.SharkCliDriver$.main(SharkCliDriver.scala:203)
at shark.SharkCliDriver.main(SharkCliDriver.scala)
Caused by: java.lang.ClassNotFoundException: org.apache.hadoop.thirdparty.guava.common.collect.LinkedListMultimap
at java.net.URLClassLoader$1.run(URLClassLoader.java:202)
at java.security.AccessController.doPrivileged(Native Method)
at java.net.URLClassLoader.findClass(URLClassLoader.java:190)
at java.lang.ClassLoader.loadClass(ClassLoader.java:307)
at sun.misc.Launcher$AppClassLoader.loadClass(Launcher.java:301)
at java.lang.ClassLoader.loadClass(ClassLoader.java:248)
... 36 more
reason：CDH版本的缺少一个第三方包guava-*.jar
解决：建一个目录${SHARK_HOME}/lib_managed/jars/org.apache.hadoop/thirdparty，拷贝${HADOOP_HOME}/lib/guava-r09-jarjar.jar到这个目录
重新进入Shark
3.show tables出现问题
Failed with exception java.io.IOException:java.io.IOException: Cannot create an instance of InputFormat class org.apache.hadoop.mapred.TextInputFormat as specified in
mapredWork!
reason：缺少hadoop-lzo-*.jar引起的
解决：建一个目录${SHARK_HOME}/lib_managed/jars/org.apache.hadoop/lib, 拷贝${HADOOP_HOME}/lib/hadoop-lzo-*.jar到这个目录
重新进入Shark
4.SELECT count(1) FROM src_cached出现问题
spark.SparkException: Job failed: ShuffleMapTask(6, 0) failed: ExceptionFailure(java.lang.NoSuchMethodError: sun.misc.Unsafe.copyMemory(Ljava/lang/Object;JLjava/lang/Object;JJ)
V)at spark.scheduler.DAGScheduler
at scala.collection.mutable.ResizableArray$class.foreach(ResizableArray.scala:60)
at scala.collection.mutable.ArrayBuffer.foreach(ArrayBuffer.scala:47)
at spark.scheduler.DAGScheduler.abortStage(DAGScheduler.scala:640)
at spark.scheduler.DAGScheduler.handleTaskCompletion(DAGScheduler.scala:601)
at spark.scheduler.DAGScheduler.processEvent(DAGScheduler.scala:300)
at spark.scheduler.DAGScheduler.spark$scheduler$DAGScheduler
FAILED: Execution Error, return code -101 from shark.execution.SparkTask
reason：java1.6版本低，需要安装jdk7.
解决：安装jdk7, JAVA_HOME指向新的JDK7,问题解决
tar xvfz jdk-7u25-linux-x64.tar.gz -C /usr/java/
export JAVA_HOME=/usr/java/jdk1.7.0_25
export CLASSPATH=/usr/java/jdk1.7.0_25/lib
重新进入Shark