Hi Feng,
active nodes are 20 in our evironment(5 in each datacenter), and
hadoop is actually running. when we did wordcount example, mapers and
reducers can not communicate to each other using external ip(dns) in
ec2.
they alwasy tried to communicate by internal ips. internal ips can be
used to do interactions in the same datacenters, but internal ips
cannot be used to do interactions between two nodes of different
datacenters. so, the following error occured.
"INFO mapred.JobClient: Task Id :
attempt_201009121539_0002_m_000003_1, Status : FAILED
Too many fetch-failures
WARN mapred.JobClient: Error reading task
outputip-10-48-98-34.eu-west-1.compute.internal"
Thanks,
Tao You
