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From suresh pendap <sureshfors...@gmail.com>
Subject Re: regarding exposing merge metrics
Date Tue, 09 Jan 2018 20:00:22 GMT
Thanks Shalin for sharing the link. However if I follow the thread then it
seems like there was no conclusive evidence found that the performance
degradation was due to the merge or index related metrics.
If that is the case then can we just get rid of the config and publish
these metrics by default?


Regards
suresh



On Mon, Jan 8, 2018 at 10:25 PM, Shalin Shekhar Mangar <
shalinmangar@gmail.com> wrote:

> The merge metrics were enabled by default in 6.4 but they were turned
> off in 6.4.2 because of large performance degradations. For more
> details, see https://issues.apache.org/jira/browse/SOLR-10130
>
> On Tue, Jan 9, 2018 at 9:11 AM, S G <sg.online.email@gmail.com> wrote:
> > Yes, this is actually confusing and the documentation (
> > https://lucene.apache.org/solr/guide/7_2/metrics-reporting.html) does
> not
> > help either:
> >
> > *Index Merge Metrics* : These metrics are collected in respective
> > registries for each core (e.g., solr.core.collection1….), under the INDEX
> > category.
> > Basic metrics are always collected - collection of additional metrics can
> > be turned on using boolean parameters in the /config/indexConfig/metrics.
> >
> > However, we do not see the merge-metrics being collected if the above
> > config is absent. So what basic metrics are always collected for merge?
> > And why do the merge metrics require an additional config while most of
> the
> > others are reported directly?
> >
> > Thanks
> > SG
> >
> >
> >
> > On Mon, Jan 8, 2018 at 2:02 PM, suresh pendap <sureshforsolr@gmail.com>
> > wrote:
> >
> >> Hi,
> >> I am following the instructions from
> >> https://lucene.apache.org/solr/guide/7_1/metrics-reporting.html
> >>  in order to expose the Index merge related metrics.
> >>
> >> The document says that we have to add the below snippet in order to
> expose
> >> the merge metrics
> >>
> >> <config>
> >>   ...
> >>   <indexConfig>
> >>     <metrics>
> >>       <majorMergeDocs>524288</majorMergeDocs>
> >>       <bool name="mergeDetails">true</bool>
> >>     </metrics>
> >>     ...
> >>   </indexConfig>
> >> ...</config>
> >>
> >>
> >>
> >> I would like to know why is this metrics not exposed by default just
> like
> >> all the other metrics?
> >>
> >> Is there any performance overhead that we should be concerned about it?
> >>
> >> If there was no particular reason, then can we expose it by default?
> >>
> >>
> >>
> >> Regards
> >> Suresh
> >>
>
>
>
> --
> Regards,
> Shalin Shekhar Mangar.
>

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