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This is an automatically generated e-mail. To reply, visit:
http://review.hbase.org/r/98/
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(Updated 2010-05-31 19:49:20.012863)
Review request for hbase.
Changes
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Improved to address comments from tsuna, Paul Crown, and jdcryans.
Summary
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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 (updated)
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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
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Unit tests passed locally for me.
Thanks,
Mingjie
