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POWriting one file per group in Pig Latin
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copied!<p><strong>The Problem:</strong> I have numerous files that contain Apache web server log entries. Those entries are not in date time order and are scattered across the files. I am trying to use Pig to read a day's worth of files, group and order the log entries by date time, then write them to files named for the day and hour of the entries it contains.</p> <p><strong>Setup:</strong> Once I have imported my files, I am using Regex to get the date field, then I am truncating it to hour. This produces a set that has the record in one field, and the date truncated to hour in another. From here I am grouping on the date-hour field.</p> <p><strong>First Attempt:</strong> My first thought was to use the STORE command while iterating through my groups using a FOREACH and quickly found out that is not cool with Pig.</p> <p><strong>Second Attempt:</strong> My second try was to use the MultiStorage() method in the piggybank which worked great until I looked at the file. The problem is that MulitStorage wants to write all fields to the file, including the field I used to group on. What I really want is just the original record written to the file.</p> <p><strong>The Question:</strong> So...am I using Pig for something it is not intended for, or is there a better way for me to approach this problem using Pig? Now that I have this question out there, I will work on a simple code example to further explain my problem. Once I have it, I will post it here. Thanks in advance.</p>

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