錯誤一

Caused by: ERROR XJ040: Failed to start database 'metastore_db' with class loader org.apache.spark.sql.hive.client.IsolatedClientLoader$$anon$1@19105a87, see the next exception for details.
        at org.apache.derby.iapi.error.StandardException.newException(Unknown Source)
        at org.apache.derby.impl.jdbc.SQLExceptionFactory.wrapArgsForTransportAcrossDRDA(Unknown
 
 Source)
        ... 152 more
Caused by: ERROR XSDB6: Another instance of Derby may have already booted the database /opt/software/spark-2.2.0-bin-2.6.0-cdh5.7.0/bin/metastore_db.

WARN TaskSchedulerImpl: Initial job has not accepted 
any resources; 
check your cluster UI to ensure 
that workers are registered and 
have sufficient resources
 

產生的原因：當在一個session中啟動spark後，又開啟了一個session，會報上面的錯誤，因為spark預設的元資料儲存在derby，derby是單session的。

錯誤二

• local模式錯誤

Exception in thread "main" java.lang.Exception: When running with master 'yarn' either HADOOP_CONF_DIR or YARN_CONF_DIR must be set in the environment.
        at org.apache.spark.deploy.SparkSubmitArguments.validateSubmitArguments(SparkSubmitArguments.scala:263
 
)
        at org.apache.spark.deploy.SparkSubmitArguments.validateArguments(SparkSubmitArguments.scala:240)
        at org.apache.spark.deploy.SparkSubmitArguments.<init>(SparkSubmitArguments.scala:116)
        at org.apache.spark.deploy.SparkSubmit$.main(SparkSubmit.scala:112)
        at org.apache.spark.deploy.SparkSubmit.main(SparkSubmit.scala)

產生的原因：基於local模式下，將hadoop配置檔案目錄加入saprk的環境變數中。
如果沒有在vi saprk-env.sh中配置HADOOP_CONF_DIR or YARN_CONF_DIR會報錯；
在vi saprk-env.sh中加入：HADOOP_CONF_DIR=/home/hadoop/apps/hadoop/etc/hadoop

錯誤三

• yarn模式錯誤

Caused by: javax.jdo.JDOFatalDataStoreException: Unable to open a test connection to the given database. JDBC url = jdbc:mysql://localhost:3306/basic01?createDatabaseIfNotExist=true, username = root. Terminating connection pool (set lazyInit to true if you expect to start your database after your app). Original Exception: ------
com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure

The last packet sent successfully to the server was 0 milliseconds ago. The driver has not received any packets from the server.
        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 com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
        at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:990)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:341)
        at com.mysql.jdbc.ConnectionImpl.coreConnect(ConnectionImpl.java:2186)
        at com.mysql.jdbc.ConnectionImpl.connectOneTryOnly(ConnectionImpl.java:2219)
        at com.mysql.jdbc.ConnectionImpl.createNewIO(ConnectionImpl.java:2014)
        at com.mysql.jdbc.ConnectionImpl.<init>(ConnectionImpl.java:776)
        at com.mysql.jdbc.JDBC4Connection.<init>(JDBC4Connection.java:47)
        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 com.mysql.jdbc.Util.handleNewInstance(Util.java:425)
        at com.mysql.jdbc.ConnectionImpl.getInstance(ConnectionImpl.java:386)
....(錯誤太長這裡省略了)
Caused by: java.net.ConnectException: Connection refused
        at java.net.PlainSocketImpl.socketConnect(Native Method)
        at java.net.AbstractPlainSocketImpl.doConnect(AbstractPlainSocketImpl.java:345)
        at java.net.AbstractPlainSocketImpl.connectToAddress(AbstractPlainSocketImpl.java:206)
        at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:188)
        at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:392)
        at java.net.Socket.connect(Socket.java:589)
        at com.mysql.jdbc.StandardSocketFactory.connect(StandardSocketFactory.java:211)
        at com.mysql.jdbc.MysqlIO.<init>(MysqlIO.java:300)
        ... 152 more

產生的原因： yarn模式下啟動./spark-shell –master yarn （會報缺少驅動的錯誤）需要加上--jars mysql驅動包或者載入jars資料夾下。

錯誤四

• NN啟動後直接輸入shark sehll，NN還處於安全模式，一般等待10秒。

org.apache.hadoop.ipc.RemoteException: Cannot create directory /user/hadoop/.sparkStaging/application_1524198951655_0002. Name node is in safe mode.
The reported blocks 0 needs additional 145 blocks to reach the threshold 0.9990 of total blocks 145.
The number of live datanodes 1 has reached the minimum number 0. Safe mode will be turned off automatically once the thresholds have been reached. 

產生的原因：Name node is in safe mode
這是因為在分散式檔案系統啟動的時候，開始的時候會有安全模式，當分散式檔案系統處於安全模式的情況下，檔案系統中的內容不允許修改也不允許刪除，直到安全模式結束。安全模式主要是為了系統啟動的時候檢查各個DataNode上資料塊的有效性，同時根據策略必要的複製或者刪除部分資料塊。執行期通過命令也可以進入安全模式。在實踐過程中，系統啟動的時候去修改和刪除檔案也會有安全模式不允許修改的出錯提示，只需要等待一會兒即可。
可以通過以下命令來手動離開安全模式：
1. $HADOOP_HOME/bin/hadoop dfsadmin -safemode leave ;
2. 使用者可以通過dfsadmin -safemode value 來操作安全模式，引數value的說明如下：

enter - 進入安全模式
leave - 強制NameNode離開安全模式
get - 返回安全模式是否開啟的資訊
wait - 等待，一直到安全模式結束。

錯誤五

• local 模式啟動報錯

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$$anonfun$foreach$1.apply(HashMap.scala:99)
  at scala.collection.mutable.HashTable$class.foreachEntry(HashTable.scala:230)
  at scala.collection.mutable.HashMap.foreachEntry(HashMap.scala:40)
  at scala.collection.mutable.HashMap.foreach(HashMap.scala:99)
  at org.apache.spark.sql.SparkSession$Builder.getOrCreate(SparkSession.scala:938)
  at org.apache.spark.repl.Main$.createSparkSession(Main.scala:97)
  ... 47 elided
Caused by: org.apache.spark.sql.AnalysisException: java.lang.RuntimeException: java.net.ConnectException: Call From hadoop/192.168.137.130 to hadoop:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused;
  at org.apache.spark.sql.hive.HiveExternalCatalog.withClient(HiveExternalCatalog.scala:106)
  at org.apache.spark.sql.hive.HiveExternalCatalog.databaseExists(HiveExternalCatalog.scala:193)
  at org.apache.spark.sql.internal.SharedState.externalCatalog$lzycompute(SharedState.scala:105)
  at org.apache.spark.sql.internal.SharedState.externalCatalog(SharedState.scala:93)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.externalCatalog(HiveSessionStateBuilder.scala:39)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog$lzycompute(HiveSessionStateBuilder.scala:54)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog(HiveSessionStateBuilder.scala:52)
  at org.apache.spark.sql.hive.HiveSessionStateBuilder.catalog(HiveSessionStateBuilder.scala:35)
  at org.apache.spark.sql.internal.BaseSessionStateBuilder.build(BaseSessionStateBuilder.scala:289)
  at org.apache.spark.sql.SparkSession$.org$apache$spark$sql$SparkSession$$instantiateSessionState(SparkSession.scala:1050)
  ... 61 more
Caused by: java.lang.RuntimeException: java.net.ConnectException: Call From hadoop/192.168.137.130 to hadoop:9000 failed on connection exception: java.net.ConnectException: Connection refused; For more details see:  http://wiki.apache.org/hadoop/ConnectionRefused
  at org.apache.hadoop.hive.ql.session.SessionState.start(SessionState.java:522)
  at org.apache.spark.sql.hive.client.HiveClientImpl.<init>(HiveClientImpl.scala:191)
  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)
  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)
  ... 70 more

產生原因：沒有啟動HDFS,start-dfs.sh