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Pig, mail # user - Slow tutorial?


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RE: Slow tutorial?
Amir Youssefi 2008-06-26, 21:12
Also, using bz2 gives error, runs were with uncompressed excite.log.bz2:
excite.log

[amiry@gsgw1011 pigtmp]$ java -cp pig_latest.jar org.apache.pig.Main -x
local script1-local.pig
2008-06-26 20:27:09,708 [main] ERROR org.apache.pig.tools.grunt.Grunt -
java.io.IOException: Unable to store alias null
        at
org.apache.pig.impl.util.WrappedIOException.wrap(WrappedIOException.java
:16)
        at org.apache.pig.PigServer.registerQuery(PigServer.java:296)
        at
org.apache.pig.tools.grunt.GruntParser.processPig(GruntParser.java:457)
        at
org.apache.pig.tools.pigscript.parser.PigScriptParser.parse(PigScriptPar
ser.java:233)
        at
org.apache.pig.tools.grunt.GruntParser.parseStopOnError(GruntParser.java
:63)
        at org.apache.pig.tools.grunt.Grunt.exec(Grunt.java:60)
        at org.apache.pig.Main.main(Main.java:294)
?Pt???4??fd???@Q(/??C?!Ap7??;?+???w]?<=v}k?m??w??[3?{=?Z????????u???????
???6r??v????l??8???????Y??vlwR??P??;??P
8p\?b?????;??}??+??|?[t??}?v>?????y?z?^h=?]??;j>w???<?Z??}?????{?c?{?n>?
????wh>?@(????W???????????m?n?????;ol????|p'{?}?t{???[???>??>???^??
                  ?oxf?)
        at
org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execut
e(LocalExecutionEngine.java:136)
        at
org.apache.pig.backend.local.executionengine.LocalExecutionEngine.execut
e(LocalExecutionEngine.java:27)
        at
org.apache.pig.PigServer.optimizeAndRunQuery(PigServer.java:413)
        at org.apache.pig.PigServer.registerQuery(PigServer.java:293)
        ... 5 more

Amir

-----Original Message-----
From: Amir Youssefi [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 26, 2008 2:06 PM
To: [EMAIL PROTECTED]; Olga Natkovich
Subject: RE: Slow tutorial?
 I created latest pig.jar, tested defaults/pig.properties with PIG-235.

 Local mode is still running after half an hour and may not finish in
hours.

 3 nodes on Hadoop/mapreduce mode ran in less than 10 min (similar to
old runs we had).

Amir
-----Original Message-----
From: Amir Youssefi [mailto:[EMAIL PROTECTED]]
Sent: Thursday, June 26, 2008 12:30 PM
To: [EMAIL PROTECTED]
Subject: RE: Slow tutorial?

Hi Mark,

 pig.jar that comes with it is old and doesn't have pig.properties.

 Try making a new build (June 26th or later) and make sure you have
these in pig.properties:

#Do not spill temp files smaller than this size (bytes)
pig.spill.size.threshold=5000000
#EXPERIMENT: Activate garbage collection when spilling a file bigger
than this size (bytes) #This should help reduce the number of files
being spilled.
pig.spill.gc.activation.size=40000000

or similar numbers...

Amir

-----Original Message-----
From: Mark Snow [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, June 25, 2008 8:07 PM
To: [EMAIL PROTECTED]
Subject: Slow tutorial?

Hi All,

I downloaded the pig tutorial to give it a whirl, set it up on a hadoop
cluster I've used for a few other tasks (7 nodes, ec2) and went through
the instructions to launch tutorial script1 with the excite bz file on
hdfs. Two things jumped out:

1) Only one mapper launched
2) It's really slow. It's been almost 5 hours and still under 10% of the
mapper is completed

Have I misconfigured something? What's a good benchmark run time for the
tutorial scripts to complete?