Re: Problem occured when running job with 1 worker.

Hi Jyoti; I assume this is the log of master vertex. It seems like master can not reach a worker for some reason. Did you also check the worker vertex's log? Maybe you can share it too. Sertug On 20-01-2014 09:22, Jyoti Yadav wrote: *h.master.MasterThread: masterThread: Master algorithm

Re: Null Pointer Exception when running a job

Hello Artie; I also had such problems when working on large datasets. It probably needs a better hadoop/mapreduce configuration. For example did you try increasing the memory of task tracker child processes in mapred-site.xml such as: property namemapred.child.java.opts/name

Some of the workers hanging while others finish

Hi all; I have a 10 machine cluster; 8 Tasktrackers, 1 namenode and 1 Jobtracker. All of them have 8GB memory. When I run a giraph job with 16 workers on a hbase table with 15 millions of rows (12GB of data) my job does not finish due to 2 (sometimes 3) workers stuck at superstep -1. Below