Hi Larry,
A DFS error has caused permanent corruption. HBase is currently
at the mercy of DFS limitations.
Given that the mapfile for your root region has been corrupted,
the easiest course for "recovery" is to delete all HBase files
in DFS and start over. It is on the roadmap to provide a "hbase
fsck" to deal with these issues in the future. If you have data
that you would like to try harder to preserve, perhaps it would
be possible to copy the 'data' and 'index' files for the ROOT
region of a pristine installation on top of the corrupt ones in
your installation, restart, and have it work out. But I suspect
there is file level corruption beyond your ROOT region, or,
perhaps you will be lucky.
Before restarting, you should try increasing the number of
configured datanode xceivers. I run with 2048. Also, given you
have only a 4 node cluster, you may find it is just too small
to spread the DFS load and more nodes will need to be added.
- Andy
> From: Larry Compton
> NativeException:
> org.apache.hadoop.hbase.client.NoServerForRegionException:
> Timed out trying to locate root region
