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https://issues.apache.org/jira/browse/HBASE-18649?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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ramkrishna.s.vasudevan updated HBASE-18649:
-------------------------------------------
Release Note:
All the mappers and reducers output type will be now of MapReduceCell type. No
more KeyValue type. How ever in branch-2 for compatibility we have allowed the
older interfaces/classes that work with KeyValue to stay in the code base but
they have been marked as deprecated.
The following interfaces/classes have been deprecated in branch-2
Import#KeyValueWritableComparablePartitioner
Import#KeyValueWritableComparator
Import#KeyValueWritableComparable
Import#KeyValueReducer
Import#KeyValueSortImporter
Import#KeyValueImporter
KeyValueSortReducer
KeyValueSerialization
WALPlayer#WALKeyValueMapper
So any existing MR jobs that is using the above public interfaces/classes will
continue to work in branch-2 and the expected output value type of those
mappers and reducers can continue to be KeyValue type.
In branch-3 the mappers and reducers output will only expect MapReduceCell as
the type and will no longer work with KeyValue type.
The new public classes/interfaces added for branch-3 and in branch-2 are
CellSerialization
CellSortReducer
Import#CellWritableComparablePartitioner
Import#CellWritableComparable
Import#CellWritableComparator
Import#CellReducer
Import#CellSortImporter
Import#CellImporter
WALPlayer#WALCellMapper
> Deprecate KV Usage in MR to move to Cells in 3.0
> ------------------------------------------------
>
> Key: HBASE-18649
> URL: https://issues.apache.org/jira/browse/HBASE-18649
> Project: HBase
> Issue Type: Improvement
> Components: API, mapreduce
> Affects Versions: 2.0.0-alpha-2
> Reporter: ramkrishna.s.vasudevan
> Assignee: ramkrishna.s.vasudevan
> Fix For: 2.0.0-beta-1
>
> Attachments: HBASE-18649-branch-2_1.patch,
> HBASE-18649-branch-2_2.patch, HBASE-18649_branch-2.patch,
> HBASE-18649-branch-2.patch, HBASE-18649_master_2.patch,
> HBASE-18649_master_3.patch, HBASE-18649_master_5.patch,
> HBASE-18649_master_6.patch, HBASE-18649_master_6.patch,
> HBASE-18649_master.patch
>
>
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