hadoop fs -getmerge /tmp/kb_test ./test_2w.json
hadoop fs -cat /tmp/kb_test/* > ./test_2w.json
hadoop fs -cat /tmp/kb_test/* >> ./test_2w.json
hadoop fs -getmerge /tmp/kb_test ./test_2w.json
hadoop fs -cat /tmp/kb_test/* > ./test_2w.json
hadoop fs -cat /tmp/kb_test/* >> ./test_2w.json
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