[HBASE-8348] Polish the migration to 0.96 - ASF JIRA

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Hadoop Flags:

Reviewed
Release Note:
Added upgrade script that must be run moving a 0.92.x or 0.94.x era hbase dataset to 0.96.x

Currently, migration works but there's still a couple of rough edges:

~~HBASE-8045~~ finished the .META. migration but didn't remove ROOT, so it's still on the filesystem.
Data in ZK needs to be removed manually. Either we fix up the data in ZK or we delete it ourselves.
TestMetaMigrationRemovingHTD has a testMetaUpdatedFlagInROOT method, but ROOT is gone now.

Elliott was also mentioning that we could have "hbase migrate" do the HFileV1 checks, clear ZK, remove ROOT, etc.

incorporates

HBASE-7766 master cannot go from 94 to 96 due to zookeeper data

is blocked by

HBASE-9134 Run NamespaceUpgrade from hbase migration script

relates to

HBASE-9110 Meta region edits not recovered while migrating to 0.96.0

HBASE-9278 Reading Pre-namespace meta table edits kills the reader

HBASE-9177 Cluster UUID is not properly parsable after rewriting to PB.

HBASE-8778 Region assigments scan table directory making them slow for huge tables

(1 relates to)

1.	Meta region edits not recovered while migrating to 0.96.0	Closed	Himanshu Vashishtha
2.	Create a migration script that will move data from 0.94.x to 0.96	Closed	Himanshu Vashishtha
3.	Document 0.96 migration	Closed	Himanshu Vashishtha