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From Alexander Asplund <alexaspl...@gmail.com>
Subject Re: Giraph offloadPartition fails creation directory
Date Thu, 12 Sep 2013 21:11:36 GMT
It's very strange.. it is definitely failing on some partitions.. currently
the disk size of a offloading worker corresponda about to the size of its
part of the graph... but the worker attempts to create additional
partitions, and this fails.
On Sep 12, 2013 2:07 PM, "Alexander Asplund" <alexasplund@gmail.com> wrote:

> Actually, I take that back. It seems it does succeeded in creating
> partitions - it just struggles with it sometimes. Should I be worried about
> these errors if partition directories seem to be filling up?
> On Sep 11, 2013 6:38 PM, "Claudio Martella" <claudio.martella@gmail.com>
> wrote:
>
>> Giraph does not offload partitions or messages to HDFS in the out-of-core
>> module. It uses local disk on the computing nodes. By defualt, it uses the
>> tasktracker local directory where for example the distributed cache is
>> stored.
>>
>> Could you provide the stacktrace Giraph is spitting when failing?
>>
>>
>> On Thu, Sep 12, 2013 at 12:54 AM, Alexander Asplund <
>> alexasplund@gmail.com> wrote:
>>
>>> Hi,
>>>
>>> I'm still trying to get Giraph to work on a graph that requires more
>>> memory that is available. The problem is that when the Workers try to
>>> offload partitions, the offloading fails. The DiskBackedPartitionStore
>>> fails to create the directory
>>> _bsp/_partitions/job-xxxx/part-vertices-xxx (roughly from recall).
>>>
>>> The input or computation will then continue for a while, which I
>>> believe is because it is still managing to hold everything in memory -
>>> but at some point it reaches the limit where there simply is no more
>>> heap space, and it crashes with OOM.
>>>
>>> Has anybody had this problem with giraph failing to make HDFS
>>> directories?
>>>
>>
>>
>>
>> --
>>    Claudio Martella
>>    claudio.martella@gmail.com
>>
>

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