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Type:
Bug
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Resolution: Done
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Priority:
Minor - P4
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None
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Affects Version/s: None
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Component/s: None
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Labels:None
https://docs.mongodb.com/master/reference/operator/aggregation/collStats/#latencystats-document
{ micros: NumberLong(137438953472), count: NumberLong(1000) },
{ micros: NumberLong(274877906944), count: NumberLong(100) }
and
1000 operations in the range (68719476736, 137438953472], and 100 operations in the range (137438953472, 274877906944].
137438953472 microseconds = 38 hours
274877906944 microseconds = 78 hours
I'm not sure where these numbers were generated but it takes considerable effort to generate an optimized query that takes this long to complete.
Here is an example document from a quick test I ran if we would like to use these values instead.
{
"ns" : "test.foo",
"localTime" : ISODate("2017-01-04T23:05:27.655Z"),
"latencyStats" : {
"reads" : {
"histogram" : [
{
"micros" : NumberLong(0),
"count" : NumberLong(1)
},
{
"micros" : NumberLong(8),
"count" : NumberLong(63523)
},
{
"micros" : NumberLong(16),
"count" : NumberLong(2204)
},
{
"micros" : NumberLong(32),
"count" : NumberLong(173)
},
{
"micros" : NumberLong(64),
"count" : NumberLong(9)
},
{
"micros" : NumberLong(256),
"count" : NumberLong(1)
}
],
"latency" : NumberLong(711472),
"ops" : NumberLong(65911)
},
"writes" : {
"histogram" : [
{
"micros" : NumberLong(0),
"count" : NumberLong(2)
},
{
"micros" : NumberLong(2),
"count" : NumberLong(2)
},
{
"micros" : NumberLong(8),
"count" : NumberLong(55375)
},
{
"micros" : NumberLong(16),
"count" : NumberLong(137587)
},
{
"micros" : NumberLong(32),
"count" : NumberLong(4278)
},
{
"micros" : NumberLong(64),
"count" : NumberLong(227)
},
{
"micros" : NumberLong(128),
"count" : NumberLong(84)
},
{
"micros" : NumberLong(256),
"count" : NumberLong(1)
},
{
"micros" : NumberLong(512),
"count" : NumberLong(3)
},
{
"micros" : NumberLong(1024),
"count" : NumberLong(126)
},
{
"micros" : NumberLong(2048),
"count" : NumberLong(3)
},
{
"micros" : NumberLong(3072),
"count" : NumberLong(1)
},
{
"micros" : NumberLong(4096),
"count" : NumberLong(6)
},
{
"micros" : NumberLong(6144),
"count" : NumberLong(4)
},
{
"micros" : NumberLong(8192),
"count" : NumberLong(15)
},
{
"micros" : NumberLong(12288),
"count" : NumberLong(6)
},
{
"micros" : NumberLong(16384),
"count" : NumberLong(1)
},
{
"micros" : NumberLong(49152),
"count" : NumberLong(1)
}
],
"latency" : NumberLong(4327980),
"ops" : NumberLong(197722)
},
"commands" : {
"histogram" : [ ],
"latency" : NumberLong(0),
"ops" : NumberLong(0)
}
}
}