解决sqoop导入报错：Caused by: java.sql.SQLException: Protocol violation

报错信息：

2017-06-15 15:02:15,374 INFO [main] org.apache.hadoop.mapred.MapTask: Ignoring exception during close for org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader@7555b920
java.io.IOException: java.sql.SQLException: Protocol violation
    at org.apache.sqoop.mapreduce.db.DBRecordReader.close(DBRecordReader.java:173)
    at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.close(MapTask.java:523)
    at org.apache.hadoop.mapred.MapTask.closeQuietly(MapTask.java:2004)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:796)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
    at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:422)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
    at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)
Caused by: java.sql.SQLException: Protocol violation
    at oracle.jdbc.driver.T4CTTIfun.readRXH(T4CTTIfun.java:631)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:391)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C7Ocommoncall.doOCOMMIT(T4C7Ocommoncall.java:75)
    at oracle.jdbc.driver.T4CConnection.doCommit(T4CConnection.java:641)
    at oracle.jdbc.driver.PhysicalConnection.commit(PhysicalConnection.java:3928)
    at oracle.jdbc.driver.PhysicalConnection.commit(PhysicalConnection.java:3934)
    at org.apache.sqoop.mapreduce.db.DBRecordReader.close(DBRecordReader.java:169)
    ... 9 more
2017-06-15 15:02:15,384 FATAL [main] org.apache.hadoop.mapred.YarnChild: Error running child : java.lang.OutOfMemoryError: Java heap space
    at java.lang.reflect.Array.newArray(Native Method)
    at java.lang.reflect.Array.newInstance(Array.java:75)
    at oracle.jdbc.driver.BufferCache.get(BufferCache.java:226)
    at oracle.jdbc.driver.PhysicalConnection.getCharBuffer(PhysicalConnection.java:7698)
    at oracle.jdbc.driver.OracleStatement.prepareAccessors(OracleStatement.java:1013)
    at oracle.jdbc.driver.T4CTTIdcb.receiveCommon(T4CTTIdcb.java:277)
    at oracle.jdbc.driver.T4CTTIdcb.receive(T4CTTIdcb.java:146)
    at oracle.jdbc.driver.T4C8Oall.readDCB(T4C8Oall.java:916)
    at oracle.jdbc.driver.T4CTTIfun.receive(T4CTTIfun.java:421)
    at oracle.jdbc.driver.T4CTTIfun.doRPC(T4CTTIfun.java:227)
    at oracle.jdbc.driver.T4C8Oall.doOALL(T4C8Oall.java:531)
    at oracle.jdbc.driver.T4CPreparedStatement.doOall8(T4CPreparedStatement.java:208)
    at oracle.jdbc.driver.T4CPreparedStatement.executeForDescribe(T4CPreparedStatement.java:886)
    at oracle.jdbc.driver.OracleStatement.executeMaybeDescribe(OracleStatement.java:1175)
    at oracle.jdbc.driver.OracleStatement.doExecuteWithTimeout(OracleStatement.java:1296)
    at oracle.jdbc.driver.OraclePreparedStatement.executeInternal(OraclePreparedStatement.java:3613)
    at oracle.jdbc.driver.OraclePreparedStatement.executeQuery(OraclePreparedStatement.java:3657)
    at oracle.jdbc.driver.OraclePreparedStatementWrapper.executeQuery(OraclePreparedStatementWrapper.java:1495)
    at org.apache.sqoop.mapreduce.db.DBRecordReader.executeQuery(DBRecordReader.java:111)
    at org.apache.sqoop.mapreduce.db.DBRecordReader.nextKeyValue(DBRecordReader.java:235)
    at org.apache.hadoop.mapred.MapTask$NewTrackingRecordReader.nextKeyValue(MapTask.java:556)
    at org.apache.hadoop.mapreduce.task.MapContextImpl.nextKeyValue(MapContextImpl.java:80)
    at org.apache.hadoop.mapreduce.lib.map.WrappedMapper$Context.nextKeyValue(WrappedMapper.java:91)
    at org.apache.hadoop.mapreduce.Mapper.run(Mapper.java:145)
    at org.apache.sqoop.mapreduce.AutoProgressMapper.run(AutoProgressMapper.java:64)
    at org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:787)
    at org.apache.hadoop.mapred.MapTask.run(MapTask.java:341)
    at org.apache.hadoop.mapred.YarnChild$2.run(YarnChild.java:164)
    at java.security.AccessController.doPrivileged(Native Method)
    at javax.security.auth.Subject.doAs(Subject.java:422)
    at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1657)
    at org.apache.hadoop.mapred.YarnChild.main(YarnChild.java:158)can

参考：http://blog.csdn.net/wsm6591289/article/details/34425919