The logstash and elasticsearch performance can be improved by using
async index options, pulling back the refresh interval, and by not
fingerprinting every document.
* Async translog allows elasticsearch to using run fsync in the
background instead of blocking
* the refresh interval will now be 5x the number of replicas with a cap
of 30. This integer is representitive of the seconds between index
refresh calls which greatly lowers the load generated across the
cluster.
* All documents were fingerprinted before writting to the cluster. This
was a costly operation as elasticsearch will do a forward lookup on all
documents with a preset ID resulting in 100's, if not 1000's, of extra
reads. The purpose of the fingerprint function is to limit repeading
writes so to keep some of this functionality the fingerprint function is
now only added to documents with messages.
* G1 garbage collection is now enabled by default when the heap size is
> 6GiB. Early versions of elasticsearch did not recommend this setting
however its since stabalized in recent releases.
* JVM options have been moved into the elasticsearch and logstash roles
allowing these tasks to trigger service restarts when changes are made.
Change-Id: I805129b207ad4db182ae6e59b6ec78eb3e246b54
Signed-off-by: Kevin Carter <kevin.carter@rackspace.com>
814622cc6c