On 1/10/2018 11:08 AM, S G wrote:
Last comment by Shawn on SOLR-10130 is:
Metrics was just a theory, sounds like that's not it.
It would be very interesting to know what really caused the slowdown and do
we really need the config or not.
That comment wasn't actually about SOLR-10130 itself.I commented on that
issue because it was semi-related to what I was looking into, so I
figured the developer who fixed it might have some insight to the
question I needed answered.
I think that SOLR-10130 was probably handled correctly and that they did
indeed find/fix the problem.
My comments were speculating about completely different performance
issues -- someone was seeing reduced performance upgrading from 4.x to a
version that included the fix for SOLR-10130. Because SOLR-10130
already indicated that metrics could cause performance issues, I was
wondering whether the metrics that were added for keeping track of Jetty
operation could possibly be the source of the user's problems. The
response I got indicated that it was unlikely that the Jetty metrics
were the cause.
Performance regressions between 4.x and later versions have been noted
by many users. I think some of them were caused by changes in Lucene,
and it's possible that those who understand these issues have not yet
found a solution to fix them.
Thanks,
Shawn
