With recently introduced BackupNode HA becomes more feasible.
Although it is not done yet and as Sunjay mentioned the plans are not clear in
that direction.
There is a presentation related to HA on hadoop wiki:
http://wiki.apache.org/hadoop/HadoopPresentations
http://files.meetup.com/1228907/Hadoop%20Namenode%20High%20Availability.pptx
Thanks,
--Konstantin
Sanjay Radia wrote:
On Mar 25, 2009, at 12:07 PM, Sangmin Lee wrote:
Hi all,
I am wondering if there is any effort or plans on HA (Highly
Available) HDFS
out there.
Currently, NameNode is single point of failure and recovery requires
human
intervention.
Many (and probably most) users of hadoop are using hdfs for batch
processing.
As a result HA for name node has not received as high a priority as
other projects since
batch jobs can wait while the name node is restarting.
Clearly this is not acceptable for non-batch use of hdfs.
Suresh has a rough prototype of HA'ed Namenode using linux HA that he is
planning put in contrib one of these days (it is low priority
background task for him).
Sorry that I don't have a better answer.
sanjay
In addition, the recovered NameNode may not same as one before the
failure.
Is there any plans or ongoing effort to improve this?
Thanks,
Sangmin
