Yi Deng created HBASE-11900:
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Summary: Optimization for incremental load reducer
Key: HBASE-11900
URL: https://issues.apache.org/jira/browse/HBASE-11900
Project: HBase
Issue Type: Improvement
Components: HFile
Affects Versions: 0.98.6
Reporter: Yi Deng
Priority: Minor
In current implementation, the key of reducer configured by
HFileOutputFormat.configureIncrementalLoad, is row. So, the reducer has to do
an in-memory sort before writing key values to the disk. When we meet with
some rows with a huge number of comlumns/versions, there could be OOM.
A better way is:
Use the KeyValue as the key, value can be a NullWritable. Partioner partitions
the KeyValue only by it's row part. Set a sort comparator that sort KeyValue
with KeyValue.COMPARATOR
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