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HBASE-2157 LATEST_TIMESTAMP not replaced by current timestamp in KeyValue 

git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@902224 13f79535-47bb-0310-9956-ffa450edef68
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Michael Stack 2010-01-22 19:06:55 +00:00
parent 60eee421aa
commit 0734674f50
2 changed files with 8 additions and 2 deletions
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2
CHANGES.txt
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@ -330,6 +330,8 @@ Release 0.21.0 - Unreleased
HBASE-2151 Remove onelab and include generated thrift classes in javadoc HBASE-2151 Remove onelab and include generated thrift classes in javadoc
(Lars Francke via Stack) (Lars Francke via Stack)
HBASE-2149 hbase.regionserver.global.memstore.lowerLimit is too low HBASE-2149 hbase.regionserver.global.memstore.lowerLimit is too low
HBASE-2157 LATEST_TIMESTAMP not replaced by current timestamp in KeyValue
(bulk loading)
NEW FEATURES NEW FEATURES
HBASE-1961 HBase EC2 scripts HBASE-1961 HBase EC2 scripts

8
src/java/org/apache/hadoop/hbase/mapreduce/package-info.java
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@ -116,8 +116,12 @@ magnitude faster if not more.
pull from your data source. Your reduce task will need to be hooked up to pull from your data source. Your reduce task will need to be hooked up to
{@link org.apache.hadoop.hbase.mapreduce.HFileOutputFormat}. It expects to receive a row id and a value. {@link org.apache.hadoop.hbase.mapreduce.HFileOutputFormat}. It expects to receive a row id and a value.
The row id must be formatted as a {@link org.apache.hadoop.hbase.io.ImmutableBytesWritable} and the The row id must be formatted as a {@link org.apache.hadoop.hbase.io.ImmutableBytesWritable} and the
value as a {@link org.apache.hadoop.hbase.KeyValue} (A KeyValue holds he value for a cell and value as a {@link org.apache.hadoop.hbase.KeyValue} (A KeyValue holds the value for a cell and
its coordinates; row/family/qualifier/timestamp, etc.). Your reduce task its coordinates; row/family/qualifier/timestamp, etc.). Note that you must
specify a timestamp when you create the KeyValue in your map task
otherwise the KeyValue will be created with the default LATEST_TIMESTAMP (Long.MAX_VALUE).
Use System.currentTimeMillis() if your data does not inherently bear a timestamp.
Your reduce task
will also need to emit the KeyValues in order. See {@link org.apache.hadoop.hbase.mapreduce.KeyValueSortReducer} will also need to emit the KeyValues in order. See {@link org.apache.hadoop.hbase.mapreduce.KeyValueSortReducer}
for an example reducer that emits KeyValues in order. for an example reducer that emits KeyValues in order.
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