joshelser opened a new pull request #1908:
URL: https://github.com/apache/hbase/pull/1908
…ster
While we never expect table descriptors to be missing, a corrupt meta
(rogue merge daughters) or corrupt filesystem (missing tabledesc) can result
in the master crashing before regions get assigned. We can guard against that
happening with a simple null-check.
I didn't try to reproduce this in a unit test, but I was able to reproduce
it in a local environment doing the following:
* `create 'usertable', 'family', {SPLITS => (1..n_splits).map{|i|
"user#{i}"}}`
* `(0..n_splits).map{|i| put 'usertable', "user#{i}", 'family:q', "#{i}"}`
* Choose two regions in the table and use `merge_region` to merge them
together (required!)
* Kill everything (master and regionserver)
* `hdfs dfs -mv /hbase/data/default/usertable/.tabledesc
/sidelined-tabledesc`
* Restart HBase
* Observe master crash
After this fix, the master stays up (and hbck can be used normally to
generate a new tabledesc and reassign any regions stuck unassigned)
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