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Re: Determine the key of Map function - Hadoop - [mail # user]
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...Ahh... Well than the key will be teacher, and the value will simply be . Then, you will see in the reducer that the first 3 entries will always be the ones you wanted. On ...
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Author: Jay Vyas,
2012-04-24, 03:52
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Re: Determine the key of Map function - Hadoop - [mail # user]
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...Its somewhat tricky to understand exactly what you need from your explanation, but I believe you want teachers who have the most students in a given class. So for English, i have 10 te...
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Author: Jay Vyas,
2012-04-24, 02:52
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Re: hadoop.tmp.dir with multiple disks - Hadoop - [mail # user]
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...I don't understand why multiple disks would be particularly beneficial for a Map/Reduce job..... would I/O for a map/reduce job be i/o *as well as CPU bound* ? I would think that simp...
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Author: Jay Vyas,
2012-04-22, 14:02
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Re: FPGrowth job got stuck when running fpGrowth.generateTopKFrequentPatterns - Hadoop - [mail # user]
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...Do you have counters for the reducers , and if so , are they continuing to update ? On Tue, Apr 10, 2012 at 8:45 AM, kayhan wrote: Jay Vyas MMSB/UCHC...
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Author: Jay Vyas,
2012-04-10, 15:28
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Re: Structuring MapReduce Jobs - Hadoop - [mail # user]
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...Hi : Well phrased question .... I think you will need to read up on reducers, and then you will see the light. 1) in your mapper, emit (date,tradeValue) objects. 2) Then hadoop w...
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Author: Jay Vyas,
2012-04-09, 16:52
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Re: map task execution time - Hadoop - [mail # user]
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...(excuse the typo in the last email : I meant "I've been playing with Cinch" , not "I've been with Cinch").... On Thu, Apr 5, 2012 at 7:54 AM, Jay Vyas wrote: Jay Vy...
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Author: Jay Vyas,
2012-04-05, 13:02
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Re: map task execution time - Hadoop - [mail # user]
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...How can "hadoop job" be used to read m/r statistics ? On Thu, Apr 5, 2012 at 7:30 AM, bikash sharma wrote: Jay Vyas MMSB/UCHC...
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Author: Jay Vyas,
2012-04-05, 12:54
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cloudera vs apache hadoop migration stories ? - Hadoop - [mail # user]
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...Seems like cloudera and standard apache-hadoop are really not cross compatible. Things like MultipleInputs and stuff that we are finding don't work the same. Any good (recent) wa...
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Author: Jay Vyas,
2012-04-04, 17:15
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Re: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:' - Hadoop - [mail # user]
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...Thanks J : just curious about how you came to hypothesize (1) (i.e. regarding the fact that threads and the API componentns arent thread safe in my hadoop version). I think thats a rea...
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Author: Jay Vyas,
2012-04-02, 15:24
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Re: org.apache.hadoop.ipc.RemoteException: org.apache.hadoop.hdfs.protocol.AlreadyBeingCreatedException:' - Hadoop - [mail # user]
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...No, my job does not write files directly to disk. It simply goes to some web pages , reads data (in the reducer phase), and parses jsons into thrift objects which are emitted via the standar...
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Author: Jay Vyas,
2012-04-02, 14:05
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