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https://issues.apache.org/jira/browse/HADOOP-2611?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12564261#action_12564261
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Bryan Duxbury commented on HADOOP-2611:
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After talking with Jim and Stack, we're going to:
- Make BatchUpdate a public class
- Add timestamp to BatchUpdate
- Add a commit() that takes a BatchUpdate
- Deprecate commit() methods that take a timestamp parameter
- Modify the communication between HTable and HRegionServer to use timestamp
from BatchUpdate and remove timestamp parameter from batchUpdate
In the case of MapReduce jobs, you should build a BatchUpdate object with the
row, timestamp, and puts/deletes you want, then emit it as the key with a small
or empty value. BatchUpdate will implement WritableComparable so that
BatchUpdates with the same row/timestamp can be merged and applied together.
> [hbase] Make BatchUpdate public in the API
> ------------------------------------------
>
> Key: HADOOP-2611
> URL: https://issues.apache.org/jira/browse/HADOOP-2611
> Project: Hadoop Core
> Issue Type: New Feature
> Components: contrib/hbase
> Reporter: Bryan Duxbury
> Assignee: Bryan Duxbury
> Fix For: 0.17.0
>
> Attachments: 2611.patch
>
>
> Today, when you want to interact with a row in HBase, you start an update,
> make changes, and then commit the lock. This is fine for very simple
> applications. However, when you try to do things like support table
> operations as part of a MapReduce job, it becomes more difficult to support.
> I propose that we create a new class, RowMutation (a la the Bigtable paper),
> which encapsulates a group of actions on a row, and make this available to
> API consumers. It might look something like:
> {code}
> RowMutation r = table.getMutation(row_key);
> r.setTimestamp(1111);
> r.put(new Text("colfam1:name", value));
> r.delete(new Text("colfam2:deleted"));
> table.commit(r);
> {code}
> This syntax would supercede the existing startUpdate/commit format, which
> could be deprecated and mapped to a RowMutation behind the scenes.
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