I have a custom Sqoop plugin, I want to use in an Oozie Sqoop action. Whenever i run the workflow, i get the following error message in the Oozie jobhistory log:
>>> Invoking Sqoop command line now >>>
1828 [main] WARN org.apache.sqoop.tool.SqoopTool - $SQOOP_CONF_DIR has not been set in the environment. Cannot check for additional configuration.
2016-08-16 10:35:31,504 WARN [main] tool.SqoopTool (SqoopTool.java:loadPluginsFromConfDir(177)) - $SQOOP_CONF_DIR has not been set in the environment. Cannot check for additional configuration.
<<< Invocation of Main class completed <<<
Failing Oozie Launcher, Main class [org.apache.oozie.action.hadoop.SqoopMain], exit code 
Oozie Launcher failed, finishing Hadoop job gracefully
I have tried running the same workflow, but changing the name of the first argument (toolname), to something random (ie. running "sqoop asdfsdf --target-dir /tmp/"), and the error is the same. Thus it seems to me, that it fails at reading the .jar file, which contains the plugin.
As i was unsure where to place the .jar plugin file, i placed it in several directories:
1) hdfs: /user/oozie/share/lib/[library_folder]
2) namenode: /usr/hdp/184.108.40.206-2557/oozie/share/lib/sqoop, /usr/hdp/220.127.116.11-2557/oozie/lib/
I created the tools.d folder: /usr/hdp/18.104.22.168-2557/oozie/share/conf/tools.d, containing an xml file, containing one line: "[package name]=[location of .jar file]"
From the same logs i can see the .jar file appear in the list of files:
Files in current dir:/grid/XXX/XXX/XXX/XXX
I have also looked in the log files of yarn ("oozie:launcher"), which gives me no further info.