reindex via mapreduce failed due to task timeout

[jaguarx]

Hi,
I have a graph instance with about 80m vertex. The graph is backed by hbase, running on a CDH cluster.
I would like to re-index a composite index of vertex property, choose MR for this due to the graph size. The map-reduce started properly, but failed after running for a while. The error message is basically saying all map tasks timed out, And here is some example message:
"AttempID:attempt_xxxxx timed out after 600 sec."

The map-reduce framework expects regular progress update, and would consider the attempt failed after a configurable amount of time (600 sec, by default).

I would propose a fix by adding some counter indicating elements already processed. But would like to have more input from the community.

Thanks!
Jaguar