Hi guys,
At some point, we do need to help with a guide for conserving memory,
but this is a generic Java problem. You can work around it by avoiding
objects as much as possible by using primitives directly. If you need
primitive collections see FastUtils, Trove, etc. Combiners also save a
lot of memory for messages.
What are your message types?
Avery
On 7/26/13 6:53 AM, Puneet Jain wrote:
Can you paste your cluster information ? I am also struggling to make
it work on 75M vertices and 100s of million edges.
On Fri, Jul 26, 2013 at 8:02 AM, jerome richard
<[email protected] <mailto:[email protected]>> wrote:
Hi,
I encountered a critical scaling problem using Giraph. I made a
very simple algorithm to test Giraph on large graphs : a connexity
test. It works on relatively large graphs (3 072 441 nodes and 117
185 083 edges) but not on very large graph (52 000 000 nodes and 2
000 000 000 edges).
In fact, during the processing of the biggest graph, Giraph core
seems to fail after the superstep 14 (15 on some jobs). The input
graph size is 30 GB stored as text and the output is also stored
as text. 9 working jobs are used to compute the graph.
Here is the tracktrace of jobs (this is the same for the 9 jobs):
java.lang.IllegalStateException: run: Caught an unrecoverable
exception exists: Failed to check
/_hadoopBsp/job_201307260439_0006/_applicationAttemptsDir/0/_superstepDir/97/_addressesAndPartitions
after 3 tries!
at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:101)
at
org.apache.hadoop.mapred.MapTask.runNewMapper(MapTask.java:764)
at org.apache.hadoop.mapred.MapTask.run(MapTask.java:370)
at org.apache.hadoop.mapred.Child$4.run(Child.java:255)
at java.security.AccessController.doPrivileged(Native Method)
at javax.security.auth.Subject.doAs(Unknown Source)
at
org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1093)
at org.apache.hadoop.mapred.Child.main(Child.java:249)
Caused by: java.lang.IllegalStateException: exists: Failed to
check
/_hadoopBsp/job_201307260439_0006/_applicationAttemptsDir/0/_superstepDir/97/_addressesAndPartitions
after 3 tries!
at
org.apache.giraph.zk.ZooKeeperExt.exists(ZooKeeperExt.java:369)
at
org.apache.giraph.worker.BspServiceWorker.startSuperstep(BspServiceWorker.java:678)
at
org.apache.giraph.graph.GraphTaskManager.execute(GraphTaskManager.java:248)
at org.apache.giraph.graph.GraphMapper.run(GraphMapper.java:91)
... 7 more
Could you help me to solve this problem?
If you need the code of the program, I can put that here (the code
is relatively tiny).
Thanks,
Jérôme.
--
--Puneet
