I've been using AIS, and I see that it now has support for incremental
updates, which is great! I'm looking forward to getting suggestions from
newly-added documents without the need to rebuild the entire suggester
index. I've run into a few problems though, and I want to see if there
is a better way to use it, or if not, suggest some possible improvements.
One issue is that AIS can be in an uninitialized state where some of its
methods throw NPE. For example, if you call add(), update(), or
getCount() before calling build(), NPE is thrown. One might say: well
just don't do that! But the only alternative I can see is to call
AIS.build() whenever your application starts. I've worked around this
by extending AIS and calling build (with an empty InputIterator) in the
constructor if I see that there is no index yet. Maybe AIS would benefit
from that?
The other question I have is how to commit() the AIS index: the writer
is not exposed, and there only seems to be a refresh() method, but no
commit(): I guess I can close() the suggester and make a new one, but
that somehow seems more heavyweight. Why do I want to commit explicitly?
Well, maybe I don't need to, but somehow I feel like I should, occasionally.
-Mike
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