Need help with field collapsing and out of memory error

[Moazzam Khan]

Hi guys,

I have about 20k documents in the Solr index (and there's a lot of
text in each of them). I have field collapsing enabled on a specific
field (AdvisorID).

The thing is if I have field collapsing enabled in the search request
I don't get correct count for the total number of records that
matched. It always says that the number of "rows" I asked to get back
is the number of total records it found.

And, when I run a query with search criteria *:* (to get the number of
total advisors in the index) solr runs of out memory and gives me an
error saying

SEVERE: java.lang.OutOfMemoryError: Java heap space
        at java.nio.CharBuffer.wrap(CharBuffer.java:350)
        at java.nio.CharBuffer.wrap(CharBuffer.java:373)
        at java.lang.StringCoding$StringDecoder.decode(StringCoding.java:138)
        at java.lang.StringCoding.decode(StringCoding.java:173)


This is going to be a huge problem later on when we index 50k
documents later on.

These are the options I am running Solr with :

java  -Xms2048M -Xmx2048M -XX:+UseConcMarkSweepGC -XX:PermSize=1024m
MaxPermSize=1024m    -jar  start.jar


Is there any way I can get the counts and not run out of memory?

Thanks in advance,
Moazzam