Append data to existing file in HDFS Java

Question

I\'m having trouble to append data to an existing file in HDFS. I want that if the file exists then append a line, if not, create a new file with the name given.

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Answer 1

HDFS does not allow append operations. One way to implement the same functionality as appending is:

• Check if file exists.
• If file doesn't exist, then create new file & write to new file
• If file exists, create a temporary file.
• Read line from original file & write that same line to temporary file (don't forget the newline)
• Write the lines you want to append to the temporary file.
• Finally, delete the original file & move(rename) the temporary file to the original file.