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Review request for hbase. Summary ------- HBASE-2468: Improvements to prewarm META cache on clients. Changes: 1. Add new HTable methods which support region info de/serialation, and region cache prewarm: - void serializeRegionInfo(): clients could perform a large scan for all the meta for the table, serialize the meta to a file. MR job can ship a copy of the meta for the table in the DistributedCache - Map<HRegionInfo, HServerAddress> deserializeRegionInfo(): MR job can deserialize the region info from the DistributedCache - prewarmRegionCache(Map<HRegionInfo, HServerAddress> regionMap): MR job can prewarm local region cache by the deserialized region info. 2. For each client, each region cache read-miss could trigger read-ahead some number of rows in META. This option could be turned on and off for one particular table. This addresses bug HBASE-2468. http://issues.apache.org/jira/browse/HBASE-2468 Diffs ----- src/main/java/org/apache/hadoop/hbase/client/HConnection.java 853164d src/main/java/org/apache/hadoop/hbase/client/HConnectionManager.java 09de2ac src/main/java/org/apache/hadoop/hbase/client/HTable.java 7ec95cb src/main/java/org/apache/hadoop/hbase/client/MetaScanner.java 3de661e src/test/java/org/apache/hadoop/hbase/client/TestFromClientSide.java 95e494a Diff: http://review.hbase.org/r/98/diff Testing ------- Unit tests passed locally for me. Thanks, Mingjie