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Direct Write

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Using Python to build a mapreduce log analysis platform based on Hadoop
analysis based course direct direct write distributed dns file

Large flow of log if the direct write Hadoop to Namenode load, so the merge before storage, you can each node log together into a file to write HDFs.  It is synthesized on a regular basis and written to the HDFs. Let's look at the size of the log, 200G DNS log files, I compress to 18G, if you can use Awk Perl, of course, but the processing speed is certainly not distributed as the force. Hadoop Streaming principle Mapper and reducer ...

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