Accumulo, mail # user - Re: scanner question in regards to columns loaded - 2014-01-25, 05:11
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Re: scanner question in regards to columns loaded
One small addendum to Christopher's explanation:

If you are using the Isolated Scanner[1], then the entire row will be
buffered on the client side. If you are have configured a table to use the
WholeRowIterator[2] in order to gain isolation guarantees while using e.g.
BatchScanner for performance reasons then that buffering instead has to
happen on the tablet servers.

Note that neither of these things are configured for use by default.

[1]:

http://accumulo.apache.org/1.5/accumulo_user_manual.html#_isolated_scanner
http://accumulo.apache.org/1.5/examples/isolation.html
http://accumulo.apache.org/1.5/apidocs/org/apache/accumulo/core/client/IsolatedScanner.html

[2]:
http://accumulo.apache.org/1.5/apidocs/org/apache/accumulo/core/iterators/user/WholeRowIterator.html

-Sean

On Fri, Jan 24, 2014 at 10:34 PM, Christopher <[EMAIL PROTECTED]> wrote:
 
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