[HBASE-6052] Convert .META. and -ROOT- content to pb - ASF JIRA

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Changed .META. and ROOT tables' content to be Protobuf serialization of HRegionInfo's instead of Writable serialization. When upgrading from 0.92 and 0.94 clusters, after master deploys META and ROOT, and before it deploys user level tables, it does a migration for the data in the catalog files, rewriting them in the new format.
Before upgrading, you can take an export of the catalog tables using ~~HBASE-3271~~ for backup.

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Changed .META. and ROOT tables' content to be Protobuf serialization of HRegionInfo's instead of Writable serialization. When upgrading from 0.92 and 0.94 clusters, after master deploys META and ROOT, and before it deploys user level tables, it does a migration for the data in the catalog files, rewriting them in the new format. Before upgrading, you can take an export of the catalog tables using HBASE-3271 for backup.

blocks

HBASE-6646 Upgrade to 0.96 section in the book

is related to

HBASE-11333 Remove deprecated class MetaMigrationConvertingToPB

relates to

HBASE-3171 Drop ROOT and instead store META location(s) directly in ZooKeeper

HBASE-3475 MetaScanner and MetaReader are very similar; purge one