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https://issues.apache.org/jira/browse/HBASE-6055?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13286429#comment-13286429
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Jonathan Hsieh commented on HBASE-6055:
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Thanks Jesse,
I haven't looked at code yet but I got a chance to read through the writeup in
HBASE-50. One thing I like about it is that it breaks out the operations,
pretty clearly describes the zk and hdfs layouts so that an admin, a tool, or
someone with info at this particular level could use the feature and inspect
the exposed zk and hdfs state for debugging.
>From the HBASE-50 doc (haven't looked at code yet), Li seems to have chosen or
>more clearly stated these design decisions:
- hlog roll (which I believe does not trigger a flush) instead of special meta
hlog marker (this might avoid write unavailability, seems simpler that the
mechanism I suggested)
- admin initiated snapshot and admin initiated restore operations as opposed to
acting like a read only table. (not sure what happens to "newer" data after a
restore, need to reread to see if it is in there, not sure about the cost to
restore a snapshot)
- I believe it also has an ability to read files directly from an MR job
without having to go through HBase's get/put interface. Is that in scope for
HBASE-6055?
Jon.
> Snapshots in HBase 0.96
> -----------------------
>
> Key: HBASE-6055
> URL: https://issues.apache.org/jira/browse/HBASE-6055
> Project: HBase
> Issue Type: New Feature
> Components: client, master, regionserver, zookeeper
> Reporter: Jesse Yates
> Assignee: Jesse Yates
> Fix For: 0.96.0
>
> Attachments: Snapshots in HBase.docx
>
>
> Continuation of HBASE-50 for the current trunk. Since the implementation has
> drastically changed, opening as a new ticket.
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