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https://issues.apache.org/jira/browse/SOLR-4445?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Colin Bartolome updated SOLR-4445:
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Description:
When running join queries on a collection with multiple shards, the "from" side
of the query is executed on the shard that serves the request only, instead of
on all shards. The matching documents are then passed to the "to" side of the
query. This leads to the overall result set being a subset of what it would be,
if the join query were run on a collection with only one shard.
That is, a four-shard collection will, on average, return 25% of the results a
single-shard collection would.
The code should execute the "from" side of the query on all available shards
before passing those matching documents to the "to" side of the query.
Note: [LUCENE-3759|https://issues.apache.org/jira/browse/LUCENE-3759] proposes
an upgrade to {{JoinUtil}} to support joining when the documents matched by the
"from" side of the query exist on multiple shards. Solr does not use that class
for joining (nor does anything else?), so this would have to be implemented
separately.
was:
When running join queries on a collection with multiple shards, the "from" site
of the query is executed on the shard that serves the request only, instead of
on all shards. The matching documents are then passed to the "to" side of the
query. This leads to the overall result set being a subset of what it would be,
if the join query were run on a collection with only one shard.
That is, a four-shard collection will, on average, return 25% of the results a
single-shard collection would.
The code should execute the "from" side of the query on all available shards
before passing those matching documents to the "to" side of the query.
Note: [LUCENE-3759|https://issues.apache.org/jira/browse/LUCENE-3759] proposes
an upgrade to {{JoinUtil}} to support joining where the documents matched by
the "from" side of the query exist on multiple shards. Solr does not use that
class for joining (nor does anything else?), so this would have to be
implemented separately.
> Join queries should execute their "from" queries on all shards
> --------------------------------------------------------------
>
> Key: SOLR-4445
> URL: https://issues.apache.org/jira/browse/SOLR-4445
> Project: Solr
> Issue Type: Improvement
> Components: query parsers, SolrCloud
> Affects Versions: 4.1
> Reporter: Colin Bartolome
>
> When running join queries on a collection with multiple shards, the "from"
> side of the query is executed on the shard that serves the request only,
> instead of on all shards. The matching documents are then passed to the "to"
> side of the query. This leads to the overall result set being a subset of
> what it would be, if the join query were run on a collection with only one
> shard.
> That is, a four-shard collection will, on average, return 25% of the results
> a single-shard collection would.
> The code should execute the "from" side of the query on all available shards
> before passing those matching documents to the "to" side of the query.
> Note: [LUCENE-3759|https://issues.apache.org/jira/browse/LUCENE-3759]
> proposes an upgrade to {{JoinUtil}} to support joining when the documents
> matched by the "from" side of the query exist on multiple shards. Solr does
> not use that class for joining (nor does anything else?), so this would have
> to be implemented separately.
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