Hadoop-2.7.2: appendToFile: Not Supported error -

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i installed hadoop 2.7.2 independently in single node mode.

i created testfile.txt content

hello world in hdfs!

but when want append lines file command:

bin/hadoop fs -appendtofile extrafile.txt testfile.txt

it throws error:

appendtofile: not supported

i'm using ubuntu server 14.04 on virtual machine. comment appreciated :)


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