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From Avery Ching <>
Subject Re: PageRank OOM Exception
Date Fri, 18 Nov 2011 05:46:55 GMT
Hi Yingyi,

Here are some ideas you might want to try:

1)  Limit the thread stack size.

2  You can set the heap available to the mapper jvm.

I.e. Here's a setting to get 10 GB of heap and use a smaller stack (64k) 
for the threads."-Xms10g -Xmx10g -Xss64k"

Also, you might want to try using the EdgeListVertex instead of Vertex 
(i.e. GiraphJob.setVertexClass(EdgeListVertex.class)), it is quite a bit 

Let us know if that helps you.  You should also check to see if your 
Hadoop installation is using a 32-bit of 64-bit JVM.  If it's 32-bit you 
will be limited in how much heap you can use.


On 11/17/11 9:38 PM, Yingyi Bu wrote:
> Hi,
>     I'm running a Giraph PageRank job.  I tried with 8GB input text 
> data over 10 nodes (each has 4 core,  4 disks,  and 12GB physical 
> memory),  that is 800MB input-data/machine.    However,  Giraph job 
> fails because of high GC costs and Out-of-Memory exception.
>     Do I set some special things in Hadoop configurations, for 
> example,  maximum heap size for map task vm ?
>     Thanks!!
> Best regards,
> Yingyi

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