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https://issues.apache.org/jira/browse/HBASE-3247?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12935574#action_12935574
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Jonathan Gray commented on HBASE-3247:
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Scanning requires you to look at all the data (or at least, more than just the
data you need). I think that would prove far to inefficient for something like
keeping a search index up to date which you expect to be as "realtime" as
possible.
This is about only needing to see the deltas.
> Changes API: API for pulling edits from HBase
> ---------------------------------------------
>
> Key: HBASE-3247
> URL: https://issues.apache.org/jira/browse/HBASE-3247
> Project: HBase
> Issue Type: Task
> Reporter: stack
>
> Talking to Shay from Elastic Search, he was asking where the Changes API is
> in HBase. Talking more -- there was a bit of beer involved so apologize up
> front -- he wants to be able to bootstrap an index and thereafter ask HBase
> for changes since time t. We thought he could tie into the replication
> stream, but rather he wants to be able to pull rather than have it pushed to
> him (in case he crashes, etc. so on recovery he can start pulling again from
> last good edit received). He could do the bootstrap with a Scan.
> Thereafter, requests to pull from hbase would pass a marker of some sort.
> HBase would then give out edits that came in after this marker, in batches,
> along with an updated marker.
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