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Solr heap size

Solr’s default heap size needs to be increased.

The following info is from Shawn Heisey’s post to the Solr mailing list. I copied it here as a note to myself, and in the hopes of helping Solr newcomers.

There are exactly two solutions to the OutOfMemoryError regarding heap
space:

1) Increase the heap size.
2) Decrease the memory requirements.

The default heap size that Solr 5.0 and later starts with is 512MB.
This is a very small heap size. We are aware that the default is very
small — this is intentional, so that the default install is runnable on
virtually any hardware.

Almost all production Solr installs will require increasing the heap
size. If you get a little bit of data in a Solr install and then make
complex query requests, it can easily require more than 512MB of total heap.

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