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From Nick Dimiduk <ndimi...@gmail.com>
Subject Re: Reg:delete performance on HBase table
Date Wed, 05 Dec 2012 18:14:53 GMT
On Wed, Dec 5, 2012 at 7:46 AM, Doug Meil <doug.meil@explorysmedical.com>wrote:

> You probably want to read this section on the RefGuide about deleting from
> HBase.
> http://hbase.apache.org/book.html#perf.deleting

So hold on. From the guide:

11.9.2. Delete RPC Behavior

> Be aware that htable.delete(Delete) doesn't use the writeBuffer. It will
> execute an RegionServer RPC with each invocation. For a large number of
> deletes, consider htable.delete(List).

> See
> http://hbase.apache.org/apidocs/org/apache/hadoop/hbase/client/HTable.html#delete%28org.apache.hadoop.hbase.client.Delete%29

So Deletes are like Puts except they're not executed the same why. Indeed,
HTable.put() is implemented using the write buffer while HTable.delete()
makes a MutateRequest directly. What is the reason for this? Why is the
semantic of Delete subtly different from Put?

For that matter, why not buffer all mutation operations?
HTable.checkAndPut(), checkAndDelete() both make direct MutateRequest calls
as well.


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