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From Giovanni Fernandez-Kincade <gfernandez-kinc...@capitaliq.com>
Subject RE: Lucene Merge Threads
Date Tue, 13 Oct 2009 02:38:06 GMT
This didn't end up working. I got the following error when I tried to commit:

Oct 12, 2009 8:36:42 PM org.apache.solr.common.SolrException log
SEVERE: org.apache.solr.common.SolrException: Error loading class '
		5
	'
	at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:310)
	at org.apache.solr.core.SolrResourceLoader.newInstance(SolrResourceLoader.java:325)
	at org.apache.solr.update.SolrIndexWriter.init(SolrIndexWriter.java:81)
	at org.apache.solr.update.SolrIndexWriter.<init>(SolrIndexWriter.java:178)
	at org.apache.solr.update.UpdateHandler.createMainIndexWriter(UpdateHandler.java:123)
	at org.apache.solr.update.DirectUpdateHandler2.openWriter(DirectUpdateHandler2.java:172)
	at org.apache.solr.update.DirectUpdateHandler2.commit(DirectUpdateHandler2.java:400)
	at org.apache.solr.update.processor.RunUpdateProcessor.processCommit(RunUpdateProcessorFactory.java:85)
	at org.apache.solr.handler.XMLLoader.processUpdate(XMLLoader.java:168)
	at org.apache.solr.handler.XMLLoader.load(XMLLoader.java:69)
	at org.apache.solr.handler.ContentStreamHandlerBase.handleRequestBody(ContentStreamHandlerBase.java:54)
	at org.apache.solr.handler.RequestHandlerBase.handleRequest(RequestHandlerBase.java:131)
	at org.apache.solr.core.SolrCore.execute(SolrCore.java:1299)
	at org.apache.solr.servlet.SolrDispatchFilter.execute(SolrDispatchFilter.java:338)
	at org.apache.solr.servlet.SolrDispatchFilter.doFilter(SolrDispatchFilter.java:241)
	at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:215)
	at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:188)
	at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:213)
	at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:172)
	at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127)
	at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:117)
	at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:108)
	at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:174)
	at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:875)
	at org.apache.coyote.http11.Http11BaseProtocol$Http11ConnectionHandler.processConnection(Http11BaseProtocol.java:665)
	at org.apache.tomcat.util.net.PoolTcpEndpoint.processSocket(PoolTcpEndpoint.java:528)
	at org.apache.tomcat.util.net.LeaderFollowerWorkerThread.runIt(LeaderFollowerWorkerThread.java:81)
	at org.apache.tomcat.util.threads.ThreadPool$ControlRunnable.run(ThreadPool.java:689)
	at java.lang.Thread.run(Unknown Source)
Caused by: java.lang.ClassNotFoundException: 
		5
	
	at java.net.URLClassLoader$1.run(Unknown Source)
	at java.security.AccessController.$$YJP$$doPrivileged(Native Method)
	at java.security.AccessController.doPrivileged(Unknown Source)
	at java.net.URLClassLoader.findClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.net.FactoryURLClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClass(Unknown Source)
	at java.lang.ClassLoader.loadClassInternal(Unknown Source)
	at java.lang.Class.$$YJP$$forName0(Native Method)
	at java.lang.Class.forName0(Unknown Source)
	at java.lang.Class.forName(Unknown Source)
	at org.apache.solr.core.SolrResourceLoader.findClass(SolrResourceLoader.java:294)
	... 28 more


I believe it's because the MaxThreadCount is not a public property of the ConcurrentMergeSchedulerClass.
You have to call this method to set it:

public void setMaxThreadCount(int count) {
    if (count < 1)
      throw new IllegalArgumentException("count should be at least 1");
    maxThreadCount = count;
  }

Is that possible through the solrconfig?

Thanks,
Gio.

-----Original Message-----
From: Giovanni Fernandez-Kincade [mailto:gfernandez-kincade@capitaliq.com] 
Sent: Monday, October 12, 2009 7:53 PM
To: solr-user@lucene.apache.org
Subject: RE: Lucene Merge Threads

Do you have to make a new call to optimize to make it start the merge again?

-----Original Message-----
From: Jason Rutherglen [mailto:jason.rutherglen@gmail.com] 
Sent: Monday, October 12, 2009 7:28 PM
To: solr-user@lucene.apache.org
Subject: Re: Lucene Merge Threads

Try this in solrconfig.xml:

<mergeScheduler class="org.apache.lucene.index.ConcurrentMergeScheduler">
  <int name="maxThreadCount">1</int>
</mergeScheduler>

Yes you can stop the process mid-merge.  The partially merged files
will be deleted on restart.

We need to update the wiki?

On Mon, Oct 12, 2009 at 4:05 PM, Giovanni Fernandez-Kincade
<gfernandez-kincade@capitaliq.com> wrote:
> Hi,
> I'm attempting to optimize a pretty large index, and even though the optimize request
timed out, I watched it using a profiler and saw that the optimize thread continued executing.
Eventually it completed, but in the background I still see a thread performing a merge:
>
> Lucene Merge Thread #0 [RUNNABLE, IN_NATIVE] CPU time: 17:51
> java.io.RandomAccessFile.readBytes(byte[], int, int)
> java.io.RandomAccessFile.read(byte[], int, int)
> org.apache.lucene.store.SimpleFSDirectory$SimpleFSIndexInput.readInternal(byte[], int,
int)
> org.apache.lucene.store.BufferedIndexInput.refill()
> org.apache.lucene.store.BufferedIndexInput.readByte()
> org.apache.lucene.store.IndexInput.readVInt()
> org.apache.lucene.index.TermBuffer.read(IndexInput, FieldInfos)
> org.apache.lucene.index.SegmentTermEnum.next()
> org.apache.lucene.index.SegmentMergeInfo.next()
> org.apache.lucene.index.SegmentMerger.mergeTermInfos(FormatPostingsFieldsConsumer)
> org.apache.lucene.index.SegmentMerger.mergeTerms()
> org.apache.lucene.index.SegmentMerger.merge(boolean)
> org.apache.lucene.index.IndexWriter.mergeMiddle(MergePolicy$OneMerge)
> org.apache.lucene.index.IndexWriter.merge(MergePolicy$OneMerge)
> org.apache.lucene.index.ConcurrentMergeScheduler.doMerge(MergePolicy$OneMerge)
> org.apache.lucene.index.ConcurrentMergeScheduler$MergeThread.run()
>
>
> This has taken quite a while, and hasn't really been fully utilizing the machine's resources.
After looking at the Lucene source, I noticed that you can set a MaxThreadCount parameter
in this class. Is this parameter exposed by Solr somehow? I see the class mentioned, commented
out, in my solrconfig.xml, but I'm not sure of the correct way to specify the parameter:
>
> <!--
>     Expert:
>     The Merge Scheduler in Lucene controls how merges are performed.  The ConcurrentMergeScheduler
(Lucene 2.3 default)
>      can perform merges in the background using separate threads.  The SerialMergeScheduler
(Lucene 2.2 default) does not.
>     -->
>    <!--<mergeScheduler>org.apache.lucene.index.ConcurrentMergeScheduler</mergeScheduler>-->
>
>
> Also, if I can specify this parameter, is it safe to just start/stop my servlet server
(Tomcat) mid-merge?
>
> Thanks in advance,
> Gio.
>

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