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From Joel Bernstein <joels...@gmail.com>
Subject Re: Joining more than 2 collections
Date Thu, 04 May 2017 17:46:49 GMT
No *:* will simply return all the results from one of the queries. It
should still join properly. If you are using the /select handler joins will
not work properly.


This example worked properly for me:

hashJoin(parallel(collection2, j
                            workers=3,
                            sort="id asc",
                            innerJoin(search(collection2, q="*:*", fl="id",
sort="id asc", qt="/export", partitionKeys="id"),
                                            search(collection2,
q="year_i:42", fl="id, year_i", sort="id asc", qt="/export",
partitionKeys="id"),
                                            on="id")),
                hashed=search(collection2, q="day_i:7", fl="id, day_i",
sort="id asc", qt="/export"),
                on="id")




Joel Bernstein
http://joelsolr.blogspot.com/

On Thu, May 4, 2017 at 12:28 PM, Zheng Lin Edwin Yeo <edwinyeozl@gmail.com>
wrote:

> Hi Joel,
>
> For the join queries, is it true that if we use q=*:* for the query for one
> of the join, there will not be any results return?
>
> Currently I found this is the case, if I just put q=*:*.
>
> Regards,
> Edwin
>
>
> On 4 May 2017 at 23:38, Zheng Lin Edwin Yeo <edwinyeozl@gmail.com> wrote:
>
> > Hi Joel,
> >
> > I think that might be one of the reason.
> > This is what I have for the /export handler in my solrconfig.xml
> >
> > <requestHandler name="/export" class="solr.SearchHandler"> <lst name=
> > "invariants"> <str name="rq">{!xport}</str> <str name="wt">xsort</str>
<
> > str name="distrib">false</str> </lst> <arr name="components">
> <str>query</
> > str> </arr> </requestHandler>
> >
> > This is the error message that I get when I use the /export handler.
> >
> > java.io.IOException: java.util.concurrent.ExecutionException:
> > java.io.IOException: --> http://localhost:8983/solr/
> > collection1_shard1_replica1/: An exception has occurred on the server,
> > refer to server log for details.
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream.
> > openStreams(CloudSolrStream.java:451)
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream.
> > open(CloudSolrStream.java:308)
> > at org.apache.solr.client.solrj.io.stream.PushBackStream.open(
> > PushBackStream.java:70)
> > at org.apache.solr.client.solrj.io.stream.JoinStream.open(
> > JoinStream.java:147)
> > at org.apache.solr.client.solrj.io.stream.ExceptionStream.
> > open(ExceptionStream.java:51)
> > at org.apache.solr.handler.StreamHandler$TimerStream.
> > open(StreamHandler.java:457)
> > at org.apache.solr.client.solrj.io.stream.TupleStream.
> > writeMap(TupleStream.java:63)
> > at org.apache.solr.response.JSONWriter.writeMap(
> > JSONResponseWriter.java:547)
> > at org.apache.solr.response.TextResponseWriter.writeVal(
> > TextResponseWriter.java:193)
> > at org.apache.solr.response.JSONWriter.writeNamedListAsMapWithDups(
> > JSONResponseWriter.java:209)
> > at org.apache.solr.response.JSONWriter.writeNamedList(
> > JSONResponseWriter.java:325)
> > at org.apache.solr.response.JSONWriter.writeResponse(
> > JSONResponseWriter.java:120)
> > at org.apache.solr.response.JSONResponseWriter.write(
> > JSONResponseWriter.java:71)
> > at org.apache.solr.response.QueryResponseWriterUtil.writeQueryResponse(
> > QueryResponseWriterUtil.java:65)
> > at org.apache.solr.servlet.HttpSolrCall.writeResponse(
> > HttpSolrCall.java:732)
> > at org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:473)
> > at org.apache.solr.servlet.SolrDispatchFilter.doFilter(
> > SolrDispatchFilter.java:345)
> > at org.apache.solr.servlet.SolrDispatchFilter.doFilter(
> > SolrDispatchFilter.java:296)
> > at org.eclipse.jetty.servlet.ServletHandler$CachedChain.
> > doFilter(ServletHandler.java:1691)
> > at org.eclipse.jetty.servlet.ServletHandler.doHandle(
> > ServletHandler.java:582)
> > at org.eclipse.jetty.server.handler.ScopedHandler.handle(
> > ScopedHandler.java:143)
> > at org.eclipse.jetty.security.SecurityHandler.handle(
> > SecurityHandler.java:548)
> > at org.eclipse.jetty.server.session.SessionHandler.
> > doHandle(SessionHandler.java:226)
> > at org.eclipse.jetty.server.handler.ContextHandler.
> > doHandle(ContextHandler.java:1180)
> > at org.eclipse.jetty.servlet.ServletHandler.doScope(
> > ServletHandler.java:512)
> > at org.eclipse.jetty.server.session.SessionHandler.
> > doScope(SessionHandler.java:185)
> > at org.eclipse.jetty.server.handler.ContextHandler.
> > doScope(ContextHandler.java:1112)
> > at org.eclipse.jetty.server.handler.ScopedHandler.handle(
> > ScopedHandler.java:141)
> > at org.eclipse.jetty.server.handler.ContextHandlerCollection.handle(
> > ContextHandlerCollection.java:213)
> > at org.eclipse.jetty.server.handler.HandlerCollection.
> > handle(HandlerCollection.java:119)
> > at org.eclipse.jetty.server.handler.HandlerWrapper.handle(
> > HandlerWrapper.java:134)
> > at org.eclipse.jetty.server.Server.handle(Server.java:534)
> > at org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.java:320)
> > at org.eclipse.jetty.server.HttpConnection.onFillable(
> > HttpConnection.java:251)
> > at org.eclipse.jetty.io.AbstractConnection$ReadCallback.succeeded(
> > AbstractConnection.java:273)
> > at org.eclipse.jetty.io.FillInterest.fillable(FillInterest.java:95)
> > at org.eclipse.jetty.io.SelectChannelEndPoint$2.run(
> > SelectChannelEndPoint.java:93)
> > at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.
> > executeProduceConsume(ExecuteProduceConsume.java:303)
> > at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.
> > produceConsume(ExecuteProduceConsume.java:148)
> > at org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume.run(
> > ExecuteProduceConsume.java:136)
> > at org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(
> > QueuedThreadPool.java:671)
> > at org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(
> > QueuedThreadPool.java:589)
> > at java.lang.Thread.run(Thread.java:745)
> > Caused by: java.util.concurrent.ExecutionException: java.io.IOException:
> > --> http://localhost:8983/solr/collection1_shard1_replica1/: An
> exception
> > has occurred on the server, refer to server log for details.
> > at java.util.concurrent.FutureTask.report(FutureTask.java:122)
> > at java.util.concurrent.FutureTask.get(FutureTask.java:192)
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream.
> > openStreams(CloudSolrStream.java:445)
> > ... 42 more
> > Caused by: java.io.IOException: --> http://localhost:8983/solr/
> > collection1_shard1_replica1/: An exception has occurred on the server,
> > refer to server log for details.
> > at org.apache.solr.client.solrj.io.stream.SolrStream.read(
> > SolrStream.java:238)
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream$
> > TupleWrapper.next(CloudSolrStream.java:541)
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream$
> > StreamOpener.call(CloudSolrStream.java:564)
> > at org.apache.solr.client.solrj.io.stream.CloudSolrStream$
> > StreamOpener.call(CloudSolrStream.java:551)
> > at java.util.concurrent.FutureTask.run(FutureTask.java:266)
> > at org.apache.solr.common.util.ExecutorUtil$MDCAwareThreadPoolExecutor.
> > lambda$execute$0(ExecutorUtil.java:229)
> > at java.util.concurrent.ThreadPoolExecutor.runWorker(
> > ThreadPoolExecutor.java:1142)
> > at java.util.concurrent.ThreadPoolExecutor$Worker.run(
> > ThreadPoolExecutor.java:617)
> > ... 1 more
> > Caused by: org.noggit.JSONParser$ParseException: JSON Parse Error:
> > char=<,position=0 BEFORE='<' AFTER='?xml version="1.0"
> encoding="UTF-8"?> <'
> > at org.noggit.JSONParser.err(JSONParser.java:356)
> > at org.noggit.JSONParser.handleNonDoubleQuoteString(JSONParser.java:712)
> > at org.noggit.JSONParser.next(JSONParser.java:886)
> > at org.noggit.JSONParser.nextEvent(JSONParser.java:930)
> > at org.apache.solr.client.solrj.io.stream.JSONTupleStream.
> > expect(JSONTupleStream.java:97)
> > at org.apache.solr.client.solrj.io.stream.JSONTupleStream.
> > advanceToDocs(JSONTupleStream.java:179)
> > at org.apache.solr.client.solrj.io.stream.JSONTupleStream.
> > next(JSONTupleStream.java:77)
> > at org.apache.solr.client.solrj.io.stream.SolrStream.read(
> > SolrStream.java:207)
> > ... 8 more
> >
> >
> > Regards,
> > Edwin
> >
> >
> > On 4 May 2017 at 22:54, Joel Bernstein <joelsolr@gmail.com> wrote:
> >
> >> I suspect that there is something not quite right about the how the
> >> /export
> >> handler is configured. Straight out of the box in solr 6.4.2  /export
> will
> >> be automatically configured. Are you using a Solr instance that has been
> >> upgraded in the past and doesn't have standard 6.4.2 configs?
> >>
> >> To really do joins properly you'll have to use the /export handler
> because
> >> /select will not stream entire result sets (unless they are pretty
> small).
> >> So your results will be missing data possibly.
> >>
> >> I would take a close look at the logs and see what all the exceptions
> are
> >> when you run the a search using qt=/export. If you can post all the
> stack
> >> traces that get generated when you run the search we'll probably be able
> >> to
> >> spot the issue.
> >>
> >> About the field ordering. There is support for field ordering in the
> >> Streaming classes but only a few places actually enforce the order. The
> >> 6.5
> >> SQL interface does keep the fields in order as does the new Tuple
> >> expression in Solr 6.6. But the expressions you are working with
> currently
> >> don't enforce field ordering.
> >>
> >>
> >>
> >>
> >> Joel Bernstein
> >> http://joelsolr.blogspot.com/
> >>
> >> On Thu, May 4, 2017 at 2:41 AM, Zheng Lin Edwin Yeo <
> edwinyeozl@gmail.com
> >> >
> >> wrote:
> >>
> >> > Hi Joel,
> >> >
> >> > I have managed to get the Join to work, but so far it is only working
> >> when
> >> > I use qt="/select". It is not working when I use qt="/export".
> >> >
> >> > For the display of the field, is there a way to allow it to list them
> in
> >> > the order which I want?
> >> > Currently, the display is quite random, and I can get a field in
> >> > collection1, followed by a field in collection3, then collection1
> again,
> >> > and then collection2.
> >> >
> >> > It will be good if we can arrange the field to display in the order
> >> that we
> >> > want.
> >> >
> >> > Regards,
> >> > Edwin
> >> >
> >> >
> >> >
> >> > On 4 May 2017 at 09:56, Zheng Lin Edwin Yeo <edwinyeozl@gmail.com>
> >> wrote:
> >> >
> >> > > Hi Joel,
> >> > >
> >> > > It works when I started off with just one expression.
> >> > >
> >> > > Could it be that the data size is too big for export after the join,
> >> > which
> >> > > causes the error?
> >> > >
> >> > > Regards,
> >> > > Edwin
> >> > >
> >> > > On 4 May 2017 at 02:53, Joel Bernstein <joelsolr@gmail.com>
wrote:
> >> > >
> >> > >> I was just testing with the query below and it worked for me.
Some
> of
> >> > the
> >> > >> error messages I was getting with the syntax was not what I was
> >> > expecting
> >> > >> though, so I'll look into the error handling. But the joins do
work
> >> when
> >> > >> the syntax correct. The query below is joining to the same
> collection
> >> > >> three
> >> > >> times, but the mechanics are exactly the same joining three
> different
> >> > >> tables. In this example each join narrows down the result set.
> >> > >>
> >> > >> hashJoin(parallel(collection2,
> >> > >>                             workers=3,
> >> > >>                             sort="id asc",
> >> > >>                             innerJoin(search(collection2, q="*:*",
> >> > >> fl="id",
> >> > >> sort="id asc", qt="/export", partitionKeys="id"),
> >> > >>                                             search(collection2,
> >> > >> q="year_i:42", fl="id, year_i", sort="id asc", qt="/export",
> >> > >> partitionKeys="id"),
> >> > >>                                             on="id")),
> >> > >>                 hashed=search(collection2, q="day_i:7", fl="id,
> >> day_i",
> >> > >> sort="id asc", qt="/export"),
> >> > >>                 on="id")
> >> > >>
> >> > >> Joel Bernstein
> >> > >> http://joelsolr.blogspot.com/
> >> > >>
> >> > >> On Wed, May 3, 2017 at 1:29 PM, Joel Bernstein <joelsolr@gmail.com
> >
> >> > >> wrote:
> >> > >>
> >> > >> > Start off with just this expression:
> >> > >> >
> >> > >> > search(collection2,
> >> > >> >             q=*:*,
> >> > >> >             fl="a_s,b_s,c_s,d_s,e_s",
> >> > >> >             sort="a_s asc",
> >> > >> >             qt="/export")
> >> > >> >
> >> > >> > And then check the logs for exceptions.
> >> > >> >
> >> > >> > Joel Bernstein
> >> > >> > http://joelsolr.blogspot.com/
> >> > >> >
> >> > >> > On Wed, May 3, 2017 at 12:35 PM, Zheng Lin Edwin Yeo <
> >> > >> edwinyeozl@gmail.com
> >> > >> > > wrote:
> >> > >> >
> >> > >> >> Hi Joel,
> >> > >> >>
> >> > >> >> I am getting this error after I change add qt=/export
and
> removed
> >> the
> >> > >> rows
> >> > >> >> param. Do you know what could be the reason?
> >> > >> >>
> >> > >> >> {
> >> > >> >>   "error":{
> >> > >> >>     "metadata":[
> >> > >> >>       "error-class","org.apache.solr.common.SolrException",
> >> > >> >>       "root-error-class","org.apache.http.
> MalformedChunkCodingExc
> >> e
> >> > >> >> ption"],
> >> > >> >>     "msg":"org.apache.http.MalformedChunkCodingException:
CRLF
> >> > >> expected
> >> > >> >> at
> >> > >> >> end of chunk",
> >> > >> >>     "trace":"org.apache.solr.common.SolrException:
> >> > >> >> org.apache.http.MalformedChunkCodingException: CRLF expected
at
> >> end
> >> > of
> >> > >> >> chunk\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.TupleStream.lambda$wr
> >> > >> >> iteMap$0(TupleStream.java:79)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter.writeIterator(JSONRespon
> >> > >> >> seWriter.java:523)\r\n\tat
> >> > >> >> org.apache.solr.response.TextResponseWriter.writeVal(TextRes
> >> > >> >> ponseWriter.java:175)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter$2.put(JSONResponseWriter
> >> > >> >> .java:559)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.TupleStream.writeMap(
> >> > >> >> TupleStream.java:64)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter.writeMap(JSONResponseWri
> >> > >> >> ter.java:547)\r\n\tat
> >> > >> >> org.apache.solr.response.TextResponseWriter.writeVal(TextRes
> >> > >> >> ponseWriter.java:193)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter.writeNamedListAsMapWithD
> >> > >> >> ups(JSONResponseWriter.java:209)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter.writeNamedList(JSONRespo
> >> > >> >> nseWriter.java:325)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONWriter.writeResponse(JSONRespon
> >> > >> >> seWriter.java:120)\r\n\tat
> >> > >> >> org.apache.solr.response.JSONResponseWriter.write(JSONRespon
> >> > >> >> seWriter.java:71)\r\n\tat
> >> > >> >> org.apache.solr.response.QueryResponseWriterUtil.writeQueryR
> >> > >> >> esponse(QueryResponseWriterUtil.java:65)\r\n\tat
> >> > >> >> org.apache.solr.servlet.HttpSolrCall.writeResponse(HttpSolrC
> >> > >> >> all.java:732)\r\n\tat
> >> > >> >> org.apache.solr.servlet.HttpSolrCall.call(HttpSolrCall.java:
> >> > >> 473)\r\n\tat
> >> > >> >> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDisp
> >> > >> >> atchFilter.java:345)\r\n\tat
> >> > >> >> org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDisp
> >> > >> >> atchFilter.java:296)\r\n\tat
> >> > >> >> org.eclipse.jetty.servlet.ServletHandler$CachedChain.doFilte
> >> > >> >> r(ServletHandler.java:1691)\r\n\tat
> >> > >> >> org.eclipse.jetty.servlet.ServletHandler.doHandle(ServletHan
> >> > >> >> dler.java:582)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.ScopedHandler.handle(Scoped
> >> > >> >> Handler.java:143)\r\n\tat
> >> > >> >> org.eclipse.jetty.security.SecurityHandler.handle(SecurityHa
> >> > >> >> ndler.java:548)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.session.SessionHandler.doHandle(
> >> > >> >> SessionHandler.java:226)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.ContextHandler.doHandle(
> >> > >> >> ContextHandler.java:1180)\r\n\tat
> >> > >> >> org.eclipse.jetty.servlet.ServletHandler.doScope(ServletHand
> >> > >> >> ler.java:512)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.session.SessionHandler.doScope(
> >> > >> >> SessionHandler.java:185)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.ContextHandler.doScope(
> >> > >> >> ContextHandler.java:1112)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.ScopedHandler.handle(Scoped
> >> > >> >> Handler.java:141)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.ContextHandlerCollection.ha
> >> > >> >> ndle(ContextHandlerCollection.java:213)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.HandlerCollection.handle(
> >> > >> >> HandlerCollection.java:119)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.handler.HandlerWrapper.handle(Handl
> >> > >> >> erWrapper.java:134)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.Server.handle(Server.java:534)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.HttpChannel.handle(HttpChannel.
> >> > >> java:320)\r\n\tat
> >> > >> >> org.eclipse.jetty.server.HttpConnection.onFillable(HttpConne
> >> > >> >> ction.java:251)\r\n\tat
> >> > >> >> org.eclipse.jetty.io.AbstractConnection$ReadCallback.
> >> > >> >> succeeded(AbstractConnection.java:273)\r\n\tat
> >> > >> >> org.eclipse.jetty.io.FillInterest.fillable(FillInterest.
> >> > >> java:95)\r\n\tat
> >> > >> >> org.eclipse.jetty.io.SelectChannelEndPoint$2.run(SelectChann
> >> > >> >> elEndPoint.java:93)\r\n\tat
> >> > >> >> org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume
> >> > >> >> .executeProduceConsume(ExecuteProduceConsume.java:303)\r\n\tat
> >> > >> >> org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume
> >> > >> >> .produceConsume(ExecuteProduceConsume.java:148)\r\n\tat
> >> > >> >> org.eclipse.jetty.util.thread.strategy.ExecuteProduceConsume
> >> > >> >> .run(ExecuteProduceConsume.java:136)\r\n\tat
> >> > >> >> org.eclipse.jetty.util.thread.QueuedThreadPool.runJob(Queued
> >> > >> >> ThreadPool.java:671)\r\n\tat
> >> > >> >> org.eclipse.jetty.util.thread.QueuedThreadPool$2.run(QueuedT
> >> > >> >> hreadPool.java:589)\r\n\tat
> >> > >> >> java.lang.Thread.run(Thread.java:745)\r\nCaused by:
> >> > >> >> org.apache.http.MalformedChunkCodingException: CRLF expected
at
> >> end
> >> > of
> >> > >> >> chunk\r\n\tat
> >> > >> >> org.apache.http.impl.io.ChunkedInputStream.getChunkSize(Chun
> >> > >> >> kedInputStream.java:255)\r\n\tat
> >> > >> >> org.apache.http.impl.io.ChunkedInputStream.nextChunk(Chunked
> >> > >> >> InputStream.java:227)\r\n\tat
> >> > >> >> org.apache.http.impl.io.ChunkedInputStream.read(ChunkedInput
> >> > >> >> Stream.java:186)\r\n\tat
> >> > >> >> org.apache.http.impl.io.ChunkedInputStream.read(ChunkedInput
> >> > >> >> Stream.java:215)\r\n\tat
> >> > >> >> org.apache.http.impl.io.ChunkedInputStream.close(ChunkedInpu
> >> > >> >> tStream.java:316)\r\n\tat
> >> > >> >> org.apache.http.conn.BasicManagedEntity.streamClosed(BasicMa
> >> > >> >> nagedEntity.java:164)\r\n\tat
> >> > >> >> org.apache.http.conn.EofSensorInputStream.checkClose(EofSens
> >> > >> >> orInputStream.java:228)\r\n\tat
> >> > >> >> org.apache.http.conn.EofSensorInputStream.close(EofSensorInp
> >> > >> >> utStream.java:174)\r\n\tat
> >> > >> >> sun.nio.cs.StreamDecoder.implClose(StreamDecoder.java:378)\
> >> r\n\tat
> >> > >> >> sun.nio.cs.StreamDecoder.close(StreamDecoder.java:193)\r\n\tat
> >> > >> >> java.io.InputStreamReader.close(InputStreamReader.java:199)\
> >> r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.JSONTupleStream.close
> >> > >> >> (JSONTupleStream.java:92)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.SolrStream.close(Solr
> >> > >> >> Stream.java:193)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.CloudSolrStream.close
> >> > >> >> (CloudSolrStream.java:464)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.HashJoinStream.close(
> >> > >> >> HashJoinStream.java:231)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.ExceptionStream.close
> >> > >> >> (ExceptionStream.java:93)\r\n\tat
> >> > >> >> org.apache.solr.handler.StreamHandler$TimerStream.close(
> >> > >> >> StreamHandler.java:452)\r\n\tat
> >> > >> >> org.apache.solr.client.solrj.io.stream.TupleStream.lambda$wr
> >> > >> >> iteMap$0(TupleStream.java:71)\r\n\t...
> >> > >> >> 40 more\r\n",
> >> > >> >>     "code":500}}
> >> > >> >>
> >> > >> >>
> >> > >> >> Regards,
> >> > >> >> Edwin
> >> > >> >>
> >> > >> >>
> >> > >> >> On 4 May 2017 at 00:00, Joel Bernstein <joelsolr@gmail.com>
> >> wrote:
> >> > >> >>
> >> > >> >> > I've reformatted the expression below and made a
few changes.
> >> You
> >> > >> have
> >> > >> >> put
> >> > >> >> > things together properly. But these are MapReduce
joins that
> >> > require
> >> > >> >> > exporting the entire result sets. So you will need
to add
> >> > qt=/export
> >> > >> to
> >> > >> >> all
> >> > >> >> > the searches and remove the rows param. In Solr
6.6. there is
> a
> >> new
> >> > >> >> > "shuffle" expression that does this automatically.
> >> > >> >> >
> >> > >> >> > To test things you'll want to break down each expression
and
> >> make
> >> > >> sure
> >> > >> >> it's
> >> > >> >> > behaving as expected.
> >> > >> >> >
> >> > >> >> > For example first run each search. Then run the
innerJoin, not
> >> in
> >> > >> >> parallel
> >> > >> >> > mode. Then run it in parallel mode. Then try the
whole thing.
> >> > >> >> >
> >> > >> >> > hashJoin(parallel(collection2,
> >> > >> >> >                             innerJoin(search(collection2,
> >> > >> >> >                                                
       q=*:*,
> >> > >> >> >
> >> > >> >> >  fl="a_s,b_s,c_s,d_s,e_s",
> >> > >> >> >
> sort="a_s
> >> > >> asc",
> >> > >> >> >
> >> > >> >> partitionKeys="a_s",
> >> > >> >> >
> >> > qt="/export"),
> >> > >> >> >                                            search(collection1,
> >> > >> >> >                                                
       q=*:*,
> >> > >> >> >
> >> > >> >> >  fl="a_s,f_s,g_s,h_s,i_s,j_s",
> >> > >> >> >
> sort="a_s
> >> > >> asc",
> >> > >> >> >
> >> > >> >>  partitionKeys="a_s",
> >> > >> >> >
> >> >  qt="/export"),
> >> > >> >> >                                            on="a_s"),
> >> > >> >> >                              workers="2",
> >> > >> >> >                              sort="a_s asc"),
> >> > >> >> >                hashed=search(collection3,
> >> > >> >> >                                          q=*:*,
> >> > >> >> >                                          fl="a_s,k_s,l_s",
> >> > >> >> >                                          sort="a_s
asc",
> >> > >> >> >                                          qt="/export"),
> >> > >> >> >               on="a_s")
> >> > >> >> >
> >> > >> >> > Joel Bernstein
> >> > >> >> > http://joelsolr.blogspot.com/
> >> > >> >> >
> >> > >> >> > On Wed, May 3, 2017 at 11:26 AM, Zheng Lin Edwin
Yeo <
> >> > >> >> edwinyeozl@gmail.com
> >> > >> >> > >
> >> > >> >> > wrote:
> >> > >> >> >
> >> > >> >> > > Hi Joel,
> >> > >> >> > >
> >> > >> >> > > Thanks for the clarification.
> >> > >> >> > >
> >> > >> >> > > Would like to check, is this the correct way
to do the join?
> >> > >> >> Currently, I
> >> > >> >> > > could not get any results after putting in
the hashJoin for
> >> the
> >> > >> 3rd,
> >> > >> >> > > smallerStream collection (collection3).
> >> > >> >> > >
> >> > >> >> > > http://localhost:8983/solr/collection1/stream?expr=
> >> > >> >> > > hashJoin(parallel(collection2
> >> > >> >> > > ,
> >> > >> >> > > innerJoin(
> >> > >> >> > >  search(collection2,
> >> > >> >> > > q=*:*,
> >> > >> >> > > fl="a_s,b_s,c_s,d_s,e_s",
> >> > >> >> > >              sort="a_s asc",
> >> > >> >> > > partitionKeys="a_s",
> >> > >> >> > > rows=200),
> >> > >> >> > >  search(collection1,
> >> > >> >> > > q=*:*,
> >> > >> >> > > fl="a_s,f_s,g_s,h_s,i_s,j_s",
> >> > >> >> > >              sort="a_s asc",
> >> > >> >> > > partitionKeys="a_s",
> >> > >> >> > > rows=200),
> >> > >> >> > >          on="a_s"),
> >> > >> >> > > workers="2",
> >> > >> >> > >                  sort="a_s asc"),
> >> > >> >> > >          hashed=search(collection3,
> >> > >> >> > > q=*:*,
> >> > >> >> > > fl="a_s,k_s,l_s",
> >> > >> >> > > sort="a_s asc",
> >> > >> >> > > rows=200),
> >> > >> >> > > on="a_s")
> >> > >> >> > > &indent=true
> >> > >> >> > >
> >> > >> >> > >
> >> > >> >> > > Regards,
> >> > >> >> > > Edwin
> >> > >> >> > >
> >> > >> >> > >
> >> > >> >> > > On 3 May 2017 at 20:59, Joel Bernstein <joelsolr@gmail.com>
> >> > wrote:
> >> > >> >> > >
> >> > >> >> > > > Sorry, it's just called hashJoin
> >> > >> >> > > >
> >> > >> >> > > > Joel Bernstein
> >> > >> >> > > > http://joelsolr.blogspot.com/
> >> > >> >> > > >
> >> > >> >> > > > On Wed, May 3, 2017 at 2:45 AM, Zheng
Lin Edwin Yeo <
> >> > >> >> > > edwinyeozl@gmail.com>
> >> > >> >> > > > wrote:
> >> > >> >> > > >
> >> > >> >> > > > > Hi Joel,
> >> > >> >> > > > >
> >> > >> >> > > > > I am getting this error when I used
the innerHashJoin.
> >> > >> >> > > > >
> >> > >> >> > > > >  "EXCEPTION":"Invalid stream expression
> >> > innerHashJoin(parallel(
> >> > >> >> > > innerJoin
> >> > >> >> > > > >
> >> > >> >> > > > > I also can't find the documentation
on innerHashJoin for
> >> the
> >> > >> >> > Streaming
> >> > >> >> > > > > Expressions.
> >> > >> >> > > > >
> >> > >> >> > > > > Are you referring to hashJoin?
> >> > >> >> > > > >
> >> > >> >> > > > > Regards,
> >> > >> >> > > > > Edwin
> >> > >> >> > > > >
> >> > >> >> > > > >
> >> > >> >> > > > > On 3 May 2017 at 13:20, Zheng Lin
Edwin Yeo <
> >> > >> edwinyeozl@gmail.com
> >> > >> >> >
> >> > >> >> > > > wrote:
> >> > >> >> > > > >
> >> > >> >> > > > > > Hi Joel,
> >> > >> >> > > > > >
> >> > >> >> > > > > > Thanks for the info.
> >> > >> >> > > > > >
> >> > >> >> > > > > > Regards,
> >> > >> >> > > > > > Edwin
> >> > >> >> > > > > >
> >> > >> >> > > > > >
> >> > >> >> > > > > > On 3 May 2017 at 02:04, Joel
Bernstein <
> >> joelsolr@gmail.com
> >> > >
> >> > >> >> wrote:
> >> > >> >> > > > > >
> >> > >> >> > > > > >> Also take a look at the
documentation for the "fetch"
> >> > >> streaming
> >> > >> >> > > > > >> expression.
> >> > >> >> > > > > >>
> >> > >> >> > > > > >> Joel Bernstein
> >> > >> >> > > > > >> http://joelsolr.blogspot.com/
> >> > >> >> > > > > >>
> >> > >> >> > > > > >> On Tue, May 2, 2017 at 2:03
PM, Joel Bernstein <
> >> > >> >> > joelsolr@gmail.com>
> >> > >> >> > > > > >> wrote:
> >> > >> >> > > > > >>
> >> > >> >> > > > > >> > Yes you join more then
one collection with
> Streaming
> >> > >> >> > Expressions.
> >> > >> >> > > > Here
> >> > >> >> > > > > >> are
> >> > >> >> > > > > >> > a few things to keep
in mind.
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > * You'll likely want
to use the parallel function
> >> around
> >> > >> the
> >> > >> >> > > largest
> >> > >> >> > > > > >> join.
> >> > >> >> > > > > >> > You'll need to use
the join keys as the
> >> partitionKeys.
> >> > >> >> > > > > >> > * innerJoin: requires
that the streams be sorted on
> >> the
> >> > >> join
> >> > >> >> > keys.
> >> > >> >> > > > > >> > * innerHashJoin: has
no sorting requirement.
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > So a strategy for a
three collection join might
> look
> >> > like
> >> > >> >> this:
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > innerHashJoin(parallel(innerJoin(bigStream,
> >> > bigStream)),
> >> > >> >> > > > > smallerStream)
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > The largest join can
be done in parallel using an
> >> > >> innerJoin.
> >> > >> >> You
> >> > >> >> > > can
> >> > >> >> > > > > >> then
> >> > >> >> > > > > >> > wrap the stream coming
out of the parallel function
> >> in
> >> > an
> >> > >> >> > > > > innerHashJoin
> >> > >> >> > > > > >> to
> >> > >> >> > > > > >> > join it to another
stream.
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > Joel Bernstein
> >> > >> >> > > > > >> > http://joelsolr.blogspot.com/
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> > On Mon, May 1, 2017
at 9:42 PM, Zheng Lin Edwin
> Yeo <
> >> > >> >> > > > > >> edwinyeozl@gmail.com>
> >> > >> >> > > > > >> > wrote:
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >> Hi,
> >> > >> >> > > > > >> >>
> >> > >> >> > > > > >> >> Is it possible
to join more than 2 collections
> using
> >> > one
> >> > >> of
> >> > >> >> the
> >> > >> >> > > > > >> streaming
> >> > >> >> > > > > >> >> expressions (Eg:
innerJoin)? If not, is there
> other
> >> > ways
> >> > >> we
> >> > >> >> can
> >> > >> >> > > do
> >> > >> >> > > > > it?
> >> > >> >> > > > > >> >>
> >> > >> >> > > > > >> >> Currently, I may
need to join 3 or 4 collections
> >> > >> together,
> >> > >> >> and
> >> > >> >> > to
> >> > >> >> > > > > >> output
> >> > >> >> > > > > >> >> selected fields
from all these collections
> together.
> >> > >> >> > > > > >> >>
> >> > >> >> > > > > >> >> I'm using Solr
6.4.2.
> >> > >> >> > > > > >> >>
> >> > >> >> > > > > >> >> Regards,
> >> > >> >> > > > > >> >> Edwin
> >> > >> >> > > > > >> >>
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >> >
> >> > >> >> > > > > >>
> >> > >> >> > > > > >
> >> > >> >> > > > > >
> >> > >> >> > > > >
> >> > >> >> > > >
> >> > >> >> > >
> >> > >> >> >
> >> > >> >>
> >> > >> >
> >> > >> >
> >> > >>
> >> > >
> >> > >
> >> >
> >>
> >
> >
>

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