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From Shalin Shekhar Mangar <shalinman...@gmail.com>
Subject Re: regarding exposing merge metrics
Date Tue, 09 Jan 2018 06:25:09 GMT
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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