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HBASE-14838 Add clarification docs to SimpleRegionNormalizer. 

Signed-off-by: Sean Busbey <busbey@cloudera.com>
This commit is contained in:
Josh Elser 2015-12-07 12:51:44 -05:00 committed by Sean Busbey
parent bf7c36fcca
commit 00805b399f
1 changed files with 4 additions and 0 deletions
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hbase-server/src/main/java/org/apache/hadoop/hbase/master/normalizer/SimpleRegionNormalizer.java
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@ -45,6 +45,10 @@ import java.util.List;
* to merge, if R1 + R1 &lt; S, and normalization stops * to merge, if R1 + R1 &lt; S, and normalization stops
* <li> Otherwise, no action is performed * <li> Otherwise, no action is performed
* </ol> * </ol>
* <p>
* Region sizes are coarse and approximate on the order of megabytes. Additionally,
* "empty" regions (less than 1MB, with the previous note) are not merged away. This
* is by design to prevent normalization from undoing the pre-splitting of a table.
*/ */
@InterfaceAudience.Private @InterfaceAudience.Private
public class SimpleRegionNormalizer implements RegionNormalizer { public class SimpleRegionNormalizer implements RegionNormalizer {