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PODuplicate key error with mongodb 2dsphere unique index
 

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  1. PODuplicate key error with mongodb 2dsphere unique index
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    <p>I try to inserts geo points to mongodb with 2dsphere unique index, but it raises many duplicate key error.</p> <p>A simple reproduce demo:</p> <pre><code>&gt; version() 2.4.5 &gt; use geo &gt; db.test.ensureIndex( { loc : "2dsphere" }, unique=true ) &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.3736642, 23.04469194 ] }}) &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.3734775, 23.04609556 ] }}) E11000 duplicate key error index: geo.test.$loc_2dsphere dup key: { : "1f22000102222113" } </code></pre> <p>Why these totally different points raise duplicate key error?</p> <hr> <p>Update:</p> <p>I tried other tests, it seems to have something to do with accuracy.</p> <pre><code>&gt; db.test.ensureIndex( { loc : "2dsphere" }, unique=true ) &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.044 ] }}) &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.045 ] }}) E11000 duplicate key error index: geo.test.$loc_2dsphere dup key: { : "1f22000102222113" } &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.046 ] }}) E11000 duplicate key error index: geo.test.$loc_2dsphere dup key: { : "1f22000102222113" } &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.047 ] }}) E11000 duplicate key error index: geo.test.$loc_2dsphere dup key: { : "1f22000102222113" } &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.048 ] }}) E11000 duplicate key error index: geo.test.$loc_2dsphere dup key: { : "1f22000102222113" } &gt; db.test.insert({"loc" : { "type" : "Point", "coordinates" : [ 113.373, 23.049 ] }}) </code></pre> <p>In this test 23.045 to 23.048 failed, only 23.044 23.049 succeed.</p>
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    1. COLet me try this - which version of MongoDB is this?
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