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From Zheng Lin Edwin Yeo <edwinye...@gmail.com>
Subject Re: Joining more than 2 collections
Date Thu, 04 May 2017 15:38:50 GMT
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.MalformedChunkCodingExce
> > >> >> 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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