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From "Manukranth Kolloju (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-8185) Feature to enable Client Side Scanning(Client side merging) in HBase.
Date Tue, 26 Mar 2013 00:49:15 GMT

    [ https://issues.apache.org/jira/browse/HBASE-8185?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13613352#comment-13613352
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Manukranth Kolloju commented on HBASE-8185:
-------------------------------------------

The use case we are trying to solve does not need a fully consistent snapshot of the data.
The region flush is optional and we are not currently considering coordinating with the master
while performing the flush over the entire table. The snapshot thus produced will be a ragged
edge snapshot. Ted Yu, do you see any use cases that will be needing a consistent snapshot?
                
> Feature to enable Client Side Scanning(Client side merging) in HBase.
> ---------------------------------------------------------------------
>
>                 Key: HBASE-8185
>                 URL: https://issues.apache.org/jira/browse/HBASE-8185
>             Project: HBase
>          Issue Type: New Feature
>          Components: regionserver
>    Affects Versions: 0.89-fb
>            Reporter: Manukranth Kolloju
>             Fix For: 0.89-fb
>
>   Original Estimate: 168h
>  Remaining Estimate: 168h
>
> The motivation of this was to enable the client to be able to open the region scanner(and
in turn open StoreScanners) and perform the merge on the client side. This will lower the
cpu ops that are consumed by the RegionServer since the data is pulled directly from the datanode.
In cases where the user is interested to perform a large scan on hbase data check-pointed
at a point of time, we think that ClientSideScan(ClientSideMerge) would give a very high throughput
as compared to using the ClientScanner in HTable.

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