sqoop merge用法

    usage: sqoop merge [GENERIC-ARGS] [TOOL-ARGS]

    Merge arguments:

       --class-name <name>     Specify record class name to load

       --help                  Print usage instructions

       --jar-file <file>       Load class from specified jar file

       --merge-key <column>    Key column to use to join results

       --new-data <path>       Path to the more recent data set

       --onto <path>           Path to the older data set

       --target-dir <path>     Destination path for merged results

       --verbose               Print more information while working



    Generic Hadoop command-line arguments:

    (must preceed any tool-specific arguments)

    Generic options supported are

    -conf <configuration file>     specify an application configuration file

    -D <property=value>            use value for given property

    -fs <local|namenode:port>      specify a namenode

    -jt <local|resourcemanager:port>    specify a ResourceManager

    -files <comma separated list of files>    specify comma separated files to be copied to the map reduce cluster

    -libjars <comma separated list of jars>    specify comma separated jar files to include in the classpath.

    -archives <comma separated list of archives>    specify comma separated archives to be unarchived on the compute machines.

The general command line syntax is

bin/hadoop command [genericOptions] [commandOptions]

例子：

    sqoop merge \

        --new-data /tmp/orders15 \

        --onto /tmp/orders16 \

        --target-dir /tmp/orders18 \

        --jar-file /tmp/sqoop-hdfs/compile/a3ec63bf6ccc7a3e880eba7bd10395c4/userinfolbf.jar \

        --class-name userinfolbf \

        --merge-key id