number of documents in one care are different after core moved to another server

[Yandong Yao <yy...@gmail.com>]

Hi Guys,

I try to move one Solr Core from machine A to machine B, while the number
of documents are different before unload on A (numDoc=190021) and after
load on B (numDoc=190816).

I am using following code to unload it on machine A:

StreamingUpdateSolrServer server = /get/SolrServer;
server.blockUntilFinished();
server.commit(true, false);

// Unload core using CoreAdmin API
SolrCoreUtils.unLoadCore();

On machine B, I am using solr CoreAdmin API to create a new core using
existing core directory copied from A.

Why the number of documents increase?  Is it related with autoCommit or
deletion?

I pasted solrconfig.xml at http://pastebin.com/gDXJpViv, also inlined some
important setting below.

       <directoryFactory name="DirectoryFactory"

class="${solr.directoryFactory:solr.NIOFSDirectoryFactory}"/>
       ....

<indexDefaults>

    <useCompoundFile>true</useCompoundFile>

    <mergeFactor>10</mergeFactor>
    <!-- Sets the amount of RAM that may be used by Lucene indexing
         for buffering added documents and deletions before they are
         flushed to the Directory.  -->
    <ramBufferSizeMB>256</ramBufferSizeMB>
    <!-- If both ramBufferSizeMB and maxBufferedDocs is set, then
         Lucene will flush based on whichever limit is hit first.
      -->
    <!-- <maxBufferedDocs>1000</maxBufferedDocs> -->

    <maxFieldLength>10000</maxFieldLength>
    <writeLockTimeout>1000</writeLockTimeout>
    <commitLockTimeout>10000</commitLockTimeout>
</indexDefaults>

<deletionPolicy class="solr.SolrDeletionPolicy">
      <!-- The number of commit points to be kept -->
      <str name="maxCommitsToKeep">1</str>
      <!-- The number of optimized commit points to be kept -->
      <str name="maxOptimizedCommitsToKeep">0</str>
      <!--
          Delete all commit points once they have reached the given age.
          Supports DateMathParser syntax e.g.
        -->
      <!--
         <str name="maxCommitAge">30MINUTES</str>
         <str name="maxCommitAge">1DAY</str>
      -->
    </deletionPolicy>

       <autoCommit>
         <maxDocs>10000</maxDocs>
         <maxTime>5000</maxTime>
       </autoCommit>

BTW: Solr version is 4.0.

Thanks very much in advance!

Yandong