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.em...@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 <sureshfors...@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.
