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From MitchK <>
Subject Re: a bug of solr distributed search
Date Mon, 26 Jul 2010 06:06:01 GMT

Good morning,

- Mitch

Li Li wrote:
> where is the link of this patch?
> 2010/7/24 Yonik Seeley <>:
>> On Fri, Jul 23, 2010 at 2:23 PM, MitchK <> wrote:
>>> why do we do not send the output of TermsComponent of every node in the
>>> cluster to a Hadoop instance?
>>> Since TermsComponent does the map-part of the map-reduce concept, Hadoop
>>> only needs to reduce the stuff. Maybe we even do not need Hadoop for
>>> this.
>>> After reducing, every node in the cluster gets the current values to
>>> compute
>>> the idf.
>>> We can store this information in a HashMap-based SolrCache (or something
>>> like that) to provide constant-time access. To keep the values up to
>>> date,
>>> we can repeat that after every x minutes.
>> There's already a patch in JIRA that does distributed IDF.
>> Hadoop wouldn't be the right tool for that anyway... it's for batch
>> oriented systems, not low-latency queries.
>>> If we got that, it does not care whereas we use doc_X from shard_A or
>>> shard_B, since they will all have got the same scores.
>> That only works if the docs are exactly the same - they may not be.
>> -Yonik
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