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我正在嘗試通過SQOOP從Teradata到Hadoop的增量導入。這不適用於我的情況。Sqoop增量導入和CURRENT_TIMESTAMP
從錯誤中可以看出，SQOOP內部創建的SQL在語法上不正確。我甚至試着用--verbose選項....沒有有用的信息。
這裏是在Teradata表模式這我導入到Hadoop的：
CREATE TABLE Employee (EmpNo INT NOT NULL, EmpName CHAR(30), DOB DATE, Mob integer, LastUpdated timestamp );
這裏是導入命令：
sqoop import --connect jdbc:teradata://XXXXXXXX/Database=XXXXX --driver com.teradata.jdbc.TeraDriver --username XXXXX --password XXXXXX --table Employee --target-dir /user/hive/incremental_emp_table -m 1 --check-column LastUpdated --incremental lastmodified --last-value "2001-12-17 07:36:01.280000"
，我得到以下幾點：
Warning: /usr/share/hadoop_echosystem/sqoop-1.4.5//../accumulo does not exist! Accumulo imports will fail.
Please set $ACCUMULO_HOME to the root of your Accumulo installation.
Warning: /usr/share/hadoop_echosystem/sqoop-1.4.5//../zookeeper does not exist! Accumulo imports will fail.
Please set $ZOOKEEPER_HOME to the root of your Zookeeper installation.
Note: /tmp/sqoop-cloud/compile/917cdf768aea5267d838a949502ed0d0/Employee.java uses or overrides a deprecated API.
Note: Recompile with -Xlint:deprecation for details.
SLF4J: Class path contains multiple SLF4J bindings.
SLF4J: Found binding in [jar:file:/usr/share/hadoop_echosystem/hadoop-2.6.0/share/hadoop/common/lib/slf4j-log4j12-1.7.5.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/share/hadoop_echosystem/hbase-0.96.1-hadoop2/lib/slf4j-log4j12-1.6.4.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: Found binding in [jar:file:/usr/share/hadoop_echosystem/apache-hive-1.0.0-bin/lib/hive-jdbc-1.0.0-standalone.jar!/org/slf4j/impl/StaticLoggerBinder.class]
SLF4J: See http://www.slf4j.org/codes.html#multiple_bindings for an explanation.
SLF4J: Actual binding is of type [org.slf4j.impl.Log4jLoggerFactory]
15/06/16 14:20:16 ERROR manager.SqlManager: SQL exception accessing current timestamp: com.teradata.jdbc.jdbc_4.util.JDBCException: [Teradata Database] [TeraJDBC 14.10.00.26] [Error 3706] [SQLState 42000] Syntax error: expected something between '(' and ')'.
com.teradata.jdbc.jdbc_4.util.JDBCException: [Teradata Database] [TeraJDBC 14.10.00.26] [Error 3706] [SQLState 42000] Syntax error: expected something between '(' and ')'.
at com.teradata.jdbc.jdbc_4.util.ErrorFactory.makeDatabaseSQLException(ErrorFactory.java:307)
at com.teradata.jdbc.jdbc_4.statemachine.ReceiveInitSubState.action(ReceiveInitSubState.java:109)
at com.teradata.jdbc.jdbc_4.statemachine.StatementReceiveState.subStateMachine(StatementReceiveState.java:314)
at com.teradata.jdbc.jdbc_4.statemachine.StatementReceiveState.action(StatementReceiveState.java:202)
at com.teradata.jdbc.jdbc_4.statemachine.StatementController.runBody(StatementController.java:123)
at com.teradata.jdbc.jdbc_4.statemachine.StatementController.run(StatementController.java:114)
at com.teradata.jdbc.jdbc_4.TDStatement.executeStatement(TDStatement.java:384)
at com.teradata.jdbc.jdbc_4.TDStatement.executeStatement(TDStatement.java:326)
at com.teradata.jdbc.jdbc_4.TDStatement.doNonPrepExecuteQuery(TDStatement.java:314)
at com.teradata.jdbc.jdbc_4.TDStatement.executeQuery(TDStatement.java:1091)
at org.apache.sqoop.manager.SqlManager.getCurrentDbTimestamp(SqlManager.java:960)
at org.apache.sqoop.tool.ImportTool.initIncrementalConstraints(ImportTool.java:328)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:488)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
15/06/16 14:20:16 ERROR tool.ImportTool: Encountered IOException running import job: java.io.IOException: Could not get current time from database
at org.apache.sqoop.tool.ImportTool.initIncrementalConstraints(ImportTool.java:330)
at org.apache.sqoop.tool.ImportTool.importTable(ImportTool.java:488)
at org.apache.sqoop.tool.ImportTool.run(ImportTool.java:601)
at org.apache.sqoop.Sqoop.run(Sqoop.java:143)
at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:70)
at org.apache.sqoop.Sqoop.runSqoop(Sqoop.java:179)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:218)
at org.apache.sqoop.Sqoop.runTool(Sqoop.java:227)
at org.apache.sqoop.Sqoop.main(Sqoop.java:236)
我已經通過實現方法org.apache.sqoop.manager.SqlManager.getCurrentDbTimestamp（）
protected String getCurTimestampQuery() {
return "SELECT CURRENT_TIMESTAMP()";
}
SqlManager使用「SELECT CURRENT_TIMESTAMP（）;「得到當前時間戳，這在語法上是不正確的。
對於teradata，應該是」SELECT CURRENT_TIMESTAMP;「
請幫我解決這個問題。
它可能會嚇倒，因爲「CURRENT_TIMESTAMP（）」中省略了「fractional_precision」參數。我對SQOOP一無所知，但是如果可以通過這個參數發送它，它是一個值確定時間戳精度的n 0和6。 '6'是默認值。 – JNevill
@JNevill：你是對的.... – Sanjiv