If they are on 5 that means they have bigger problems. They are on Hadoop 18.
D On Mon, Mar 14, 2011 at 5:29 PM, Thejas M Nair <[email protected]> wrote: > Fragment-replicate join will also produce an efficient query plan for this > use case - > http://pig.apache.org/docs/r0.8.0/piglatin_ref1.html#Replicated+Joins . It > is available in 0.5 as well. > -Thejas > > > > On 3/14/11 3:20 PM, "Paltheru, Srikanth" <[email protected]> > wrote: > > I am using Pig 0.5 version. We don't have plans to upgrade it to a newer > version. But the problem I have is the script runs for some files(both > larger and smaller than the ones mentioned) but not for this particular one. > I get "GC overhead limit" Error. > Thanks > Sri > > > -----Original Message----- > From: Thejas M Nair [mailto:[email protected]] > Sent: Monday, March 14, 2011 4:18 PM > To: [email protected]; Paltheru, Srikanth > Subject: Re: Problems with Join in pig > > What version of pig are you using ? There have been some memory utilization > fixes in 0.8 . For this use case, you can also use the new scalar feature in > 0.8 - > > http://pig.apache.org/docs/r0.8.0/piglatin_ref2.html#Casting+Relations+to+Sc > alars . That query plan will be more efficient. > > You might want to build a new version of pig from svn 0.8 branch because > there have been some bug fixes after the release - > > svn co http://svn.apache.org/repos/asf/pig/branches/branch-0.8 > cd branch-0.8 > ant > > -Thejas > > > On 3/14/11 1:40 PM, "Paltheru, Srikanth" <[email protected]> > wrote: > > > The following pig script runs fine without the 2GB memory setting (see > > in yellow). But fails with memory setting. I am not sure what's > > happening. It's a simple operation of joining one tuple(of 1 row) with > the other tuple. > > Here is what I am trying to do: > > > > 1. grouping all SELECT HIT TIME DATA into a single tuple by doing a > > GROUP ALL. > > 2. getting the min and max of that set and putting it into MIN HIT > DATA. > > This is a tuple with a single row. > > 3. then grouping SELECT MAX VISIT TIME DATA by visid, 4. then > > generating DUMMY_KEY for every row, along with MAX of start time. > > 5. then try to join the single tuple in 2 with all tuples generated > > in 4 to get a min time and a max time > > > > Code: > > Shell prompt: > > ## setting heap size to 2 GB > > PIG_OPTS="$PIG_OPTS -Dmapred.child.java.opts=-Xmx2048m" > > export PIG_OPTS > > > > Pig/Grunt > > > > RAW_DATA = LOAD > > '/omniture_test_qa/cleansed_output_1/2011/01/05/wdgesp360/wdgesp360_20 > > 11-01-05 > > *.tsv.gz' USING PigStorage('\t'); > > FILTER_EXCLUDES_DATA = FILTER RAW_DATA BY $6 <= 0; SELECT_CAST_DATA = > > FOREACH FILTER_EXCLUDES_DATA GENERATE 'DUMMYKEY' AS > > DUMMY_KEY,(int)$0 AS hit_time_gmt, (long)$2 AS visid_high, (long)$3 AS > > visid_low, (chararray)$5 AS truncated_hit; SELECT_DATA = FILTER > > SELECT_CAST_DATA BY truncated_hit =='N'; --MIN AND MAX_HIT_TIME_GMT > > FOR THE FILE/SUITE SELECT_HIT_TIME_DATA = FOREACH SELECT_DATA GENERATE > > (int)hit_time_gmt; GROUPED_ALL_DATA = GROUP SELECT_HIT_TIME_DATA ALL > > PARALLEL 100; MIN_HIT_DATA = FOREACH GROUPED_ALL_DATA GENERATE > > 'DUMMYKEY'AS > > DUMMY_KEY,MIN(SELECT_HIT_TIME_DATA.hit_time_gmt) AS > > MIN_HIT_TIME_GMT,MAX(SELECT_HIT_TIME_DATA.hit_time_gmt) AS > > MAX_HIT_TIME_GMT; ---MAX_VISIT_START_TIME BY VISITOR_ID > > SELECT_MAX_VISIT_TIME_DATA = FOREACH SELECT_DATA GENERATE > > visid_high,visid_low,visit_start_time_gmt; > > GROUP_BY_VISID_MAX_VISIT_TIME_DATA = GROUP SELECT_MAX_VISIT_TIME_DATA > > BY > > (visid_high,visid_low) PARALLEL 100; > > MAX_VISIT_TIME = FOREACH GROUP_BY_VISID_MAX_VISIT_TIME_DATA GENERATE > > 'DUMMYKEY' AS DUMMY_KEY,FLATTEN(group.visid_high) AS > > visid_high,FLATTEN(group.visid_low) AS visid_low, > > MAX(SELECT_MAX_VISIT_TIME_DATA.visit_start_time_gmt) AS > > MAX_VISIT_START_TIME; JOINED_MAX_VISIT_TIME_DATA = COGROUP > > MAX_VISIT_TIME BY DUMMY_KEY OUTER,MIN_HIT_DATA BY DUMMY_KEY OUTER > > PARALLEL 100; MIN_MAX_VISIT_HIT_TIME = FOREACH > > JOINED_MAX_VISIT_TIME_DATA GENERATE > > FLATTEN(MAX_VISIT_TIME.visid_high),FLATTEN(MAX_VISIT_TIME.visid_low),F > > LATTEN(M > > AX_VISIT_TIME.MAX_VISIT_START_TIME),FLATTEN(MIN_HIT_DATA.MIN_HIT_TIME_ > > GMT),FLA > > TTEN(MIN_HIT_DATA.MAX_HIT_TIME_GMT); > > DUMP MIN_MAX_VISIT_HIT_TIME; > > > > > > Can any one please guide me through this problem? > > Thanks > > Sri > > > > > > >
