commit b5fe3d69271813ac5aa7966b60eb2e94947a0606
author Will Holley <willholley@gmail.com> Mon Jan 06 09:30:55 2020 +0000
committer Will Holley <willholley@gmail.com> Fri Jan 17 13:54:34 2020 +0000
tree 013adb9f569e2a9b64603e79e737dae03dd6c6e6
parent f86747f02a8b066f136a275fa28e92200404d0e7

Add mango.query_invalid_index counter

Adds a metric to expose the number of Mango queries that could not
use the index specified in the _find query.

src/couch/priv/stats_descriptions.cfg

diff --git a/src/couch/priv/stats_descriptions.cfg b/src/couch/priv/stats_descriptions.cfg
index ae203bb..0d81ea3 100644
--- a/src/couch/priv/stats_descriptions.cfg
+++ b/src/couch/priv/stats_descriptions.cfg
@@ -302,3 +302,7 @@
     {type, counter},
     {desc, <<"number of mango queries that could not use an index">>}
 ]}.
+{[mango, query_invalid_index], [
+    {type, counter},
+    {desc, <<"number of mango queries that generated an invalid index warning">>}
+]}.

src/mango/src/mango_cursor.erl

diff --git a/src/mango/src/mango_cursor.erl b/src/mango/src/mango_cursor.erl
index f508245..a16e0d5 100644
--- a/src/mango/src/mango_cursor.erl
+++ b/src/mango/src/mango_cursor.erl
@@ -166,6 +166,7 @@
 invalid_index_warning_int(Index, {use_index, [DesignId]}) ->
     case filter_indexes([Index], DesignId) of
         [] ->
+            couch_stats:increment_counter([mango, query_invalid_index]),
             Reason = fmt("_design/~s was not used because it does not contain a valid index for this query.",
                 [ddoc_name(DesignId)]),
             [Reason];
@@ -175,6 +176,7 @@
 invalid_index_warning_int(Index, {use_index, [DesignId, ViewName]}) ->
     case filter_indexes([Index], DesignId, ViewName) of
         [] ->
+            couch_stats:increment_counter([mango, query_invalid_index]),
             Reason = fmt("_design/~s, ~s was not used because it is not a valid index for this query.",
                 [ddoc_name(DesignId), ViewName]),
             [Reason];