Hi,
I have had this issue for some time already, where I get different answers
when I run the same line of code twice. I have run some experiments to see
what is happening, please help me! Here is the code and the answers that I
get. I suspect I have a problem when reading large datasets from S3.
rd1 = sc.textFile('s3n://blabla')
*rd1.persist()*
rd2 = rd_imp.filter(lambda x: filter1(x)).map(lambda x: map1(x))
Note: both filter1() and map1() are deterministic
rd2.count() ==> 294928559
rd2.count() ==> 294928559
So far so good, I get the same counts. Now when I unpersist rd1, that's when
I start getting problems!
*rd1.unpersist()*
rd2 = rd_imp.filter(lambda x: filter1(x)).map(lambda x: map1(x))
rd2.count() ==> 294928559
rd2.count() ==> 294509501
rd2.count() ==> 294679795
...
I would appreciate it if you could help me!
Thanks,
Maria
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