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Hive >> mail # user >> Issue with Hive and table with lots of column

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Re: Issue with Hive and table with lots of column
oh. thinking some more about this i forgot to ask some other basic

a) what storage format are you using for the table (text, sequence, rcfile,
orc or custom)?   "show create table <table>" would yield that.

b) what command is causing the stack trace?

my thinking here is rcfile and orc are column based (i think) and if you
don't select all the columns that could very well limit the size of the
"row" being returned and hence the size of the internal ArrayList.  OTOH,
if you're using "select *", um, you have my sympathies. :)
On Thu, Jan 30, 2014 at 11:33 AM, Stephen Sprague <[EMAIL PROTECTED]>wrote:

> thanks for the information. Up-to-date hive. Cluster on the smallish side.
> And, well, sure looks like a memory issue. :)  rather than an inherent hive
> limitation that is.
> So.  I can only speak as a user (ie. not a hive developer) but what i'd be
> interested in knowing next is is this via running hive in local mode,
> correct? (eg. not through hiveserver1/2).  And it looks like it boinks on
> array processing which i assume to be internal code arrays and not hive
> data arrays - your 15K columns are all scalar/simple types, correct?  Its
> clearly fetching results and looks be trying to store them in a java array
> - and not just one row but a *set* of rows (ArrayList)
> two things to try.
> 1. boost the heap-size. try 8192. And I don't know if HADOOP_HEAPSIZE is
> the controller of that. I woulda hoped it was called something like
> "HIVE_HEAPSIZE". :)  Anyway, can't hurt to try.
> 2. trim down the number of columns and see where the breaking point is.
> is it 10K? is it 5K?   The idea is to confirm its _the number of columns_
> that is causing the memory to blow and not some other artifact unbeknownst
> to us.
> 3. Google around the Hive namespace for something that might limit or
> otherwise control the number of rows stored at once in Hive's internal
> buffer. I snoop around too.
> That's all i got for now and maybe we'll get lucky and someone on this
> list will know something or another about this. :)
> cheers,
> Stephen.
> On Thu, Jan 30, 2014 at 2:32 AM, David Gayou <[EMAIL PROTECTED]> wrote:
>> We are using the Hive 0.12.0, but it doesn't work better on hive 0.11.0
>> or hive 0.10.0
>> Our hadoop version is 1.1.2.
>> Our cluster is 1 master + 4 slaves with 1 dual core xeon CPU (with
>> hyperthreading so 4 cores per machine) + 16Gb Ram each
>> The error message i get is :
>> 2014-01-29 12:41:09,086 ERROR thrift.ProcessFunction
>> (ProcessFunction.java:process(41)) - Internal error processing FetchResults
>> java.lang.OutOfMemoryError: Java heap space
>>         at java.util.Arrays.copyOf(Arrays.java:2734)
>>         at java.util.ArrayList.ensureCapacity(ArrayList.java:167)
>>         at java.util.ArrayList.add(ArrayList.java:351)
>>         at org.apache.hive.service.cli.Row.<init>(Row.java:47)
>>         at org.apache.hive.service.cli.RowSet.addRow(RowSet.java:61)
>>         at
>> org.apache.hive.service.cli.operation.SQLOperation.getNextRowSet(SQLOperation.java:235)
>>         at
>> org.apache.hive.service.cli.operation.OperationManager.getOperationNextRowSet(OperationManager.java:170)
>>         at
>> org.apache.hive.service.cli.session.HiveSessionImpl.fetchResults(HiveSessionImpl.java:417)
>>         at
>> org.apache.hive.service.cli.CLIService.fetchResults(CLIService.java:306)
>>         at
>> org.apache.hive.service.cli.thrift.ThriftCLIService.FetchResults(ThriftCLIService.java:386)
>>         at
>> org.apache.hive.service.cli.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1373)
>>         at
>> org.apache.hive.service.cli.thrift.TCLIService$Processor$FetchResults.getResult(TCLIService.java:1358)
>>         at
>> org.apache.thrift.ProcessFunction.process(ProcessFunction.java:39)
>>         at
>> org.apache.thrift.TBaseProcessor.process(TBaseProcessor.java:39)
>>         at
>> org.apache.hive.service.auth.TUGIContainingProcessor$1.run(TUGIContainingProcessor.java:58)