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Data and example code for Programming Pig, by Alan F. Gates
I just tried the PageRank example from Chapter 9, but it gets stuck in the reduce phase of a process on the 5th iteration of the algorithm.
Digging a little deeper, it looks like the contents of the pagerank_data_N
directories are exploding in size as N increases:
hdfs dfs -du -h out/
5 out/max_diff_1
18 out/max_diff_2
19 out/max_diff_3
18 out/max_diff_4
333.7 K out/pagerank_data_1
768.6 K out/pagerank_data_2
9.2 M out/pagerank_data_3
2.2 G out/pagerank_data_4
33.8 G out/pagerank_data_5
Looking further into the contents of pagerank_data_N
, it looks like a large number of duplicates end up in the output. I was able to fix by applying DISTINCT
to new_pagerank
:
new_pagerank = ...
new_pagerank_final = distinct new_pagerank;
store new_pagerank_final into '$docs_out' using PigStorage('\t');
..
fix was to change dividends = load 'NYSE_dividends' as (exchange, symbol, date, dividend);
to dividends = load '../../data/NYSE_dividends' as (exchange, symbol, date, dividend);
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