FAQ
Doesn't the sorting and merging all still happen in Java-land?

-----Original Message-----
From: Owen O'Malley
Sent: Thursday, November 08, 2007 5:03 PM
To: hadoop-user@lucene.apache.org
Subject: sort speeds under java, c++, and streaming

I set up a little benchmark on a 39 node cluster to sort 40gb of
random text data (generated by RandomTextWriter using key length:
1-10 words and value length: 0-200 words, data uncompressed). The
runtimes in minutes are:

Java: 4:22
C++ (Pipes): 3:50
Streaming: 4:44

I was surprised to find that Pipes out performed Java, even with the
extra process. I suspect it was because of the buffering between the
input and output of Pipes.

-- Owen

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postedNov 9, '07 at 1:03a
activeNov 9, '07 at 8:15a
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