Lucene runs in the same JVM as Elasticsearch but (by default) it mmaps
files and then iterates over their content inteligently. That means most
of its actual storage is "off heap" (its a java buzz-phrase). Anyway,
Linux will serve reads from mmaped files from its page cache. That is why
you want to leave linux a whole bunch of unused memory.
Nik
On Wed, Nov 26, 2014 at 1:53 PM, BradVido bradyvidovic@gmail.com wrote:
I've read the recommendations for ES_HEAP_SIZE
http://www.elasticsearch.org/guide/en/elasticsearch/guide/current/heap-sizing.html which
basically state to set -Xms and -Xmx to 50% physical RAM.
It says the rest should be left for Lucene to use (OS filesystem caching).
But I'm confused on how Lucene uses that. Doesn't Lucene run in the same
JVM as ES? So they would share the same max heap setting of 50%.Can someone clear this up?
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