On 5/16/23 00:35, Saksham Gupta wrote:
1. Do we need to perform full indexing in order to bring the changes in
merge setting(segmentsPerTier) to action.
Changing the settings will affect any new merges. Depending on the
change made, that might result in significant merge activity right away,
or less merge activity until later.
2. How to decide the ideal merge settings for my use case?
*Current merge settings:*
<mergePolicyFactory class="org.apache.solr.index.TieredMergePolicyFactory">
<int name="maxMergeAtOnce">5</int>
<int name="segmentsPerTier">3</int>
</mergePolicyFactory>
There is no "one size fits all" setting. A smaller number of segments
will generally perform a little bit better than lots of segments, but
the difference in current Solr versions is not as drastic as it once was.
How to set the mergePolicy is highly dependent on the particulars of
your setup and usually requires experimentation. Personally I would
leave the settings alone unless there is a noticeable problem related to
segment merges.
Thanks,
Shawn
