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提交一個spark作業，報錯：
error cluster.yarnclientschedulerbackend：the yarn application has already ended！It might have been killed or the Application Master may have failed to start.
error spark.sparkcontext：error inilializing sparkcontext.
再提交一個yarn作業，
hadoop jar /opt/cloudera/parcels/CDH-6.1-/jars/hadoop-examples.jar pi 10 1
報錯：
Application application_1560473958049_0005 failed 2 times due to AM Container
for appattempt_1560473958049_0005_000002 exited with exitCode: -1000
Diagnostics: Not able to initialize app directories in any of the configured local directories for app application_1560473958049_0005.
可以看出，是在yarn初始化作業的時候就報錯了，其實是一個權限問題。未啟用kerberos前目錄權限為yarn:yarn，啟用后變成wangkuan:yarn，導致權限不兼容。查看yarn.nodemanager.local-dirs，rm -rf 該目錄/usercache/*，之后再重啟yarn即可。
