jstests/sharding/no_empty_reset.js


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// Tests that an empty shard can't be the cause of a chunk reset

var st = new ShardingTest({ shards : 2, mongos : 2 })

// Don't balance since we're manually moving chunks
st.stopBalancer()

var coll = st.s.getCollection( jsTestName() + ".coll" )

for( var i = -10; i < 10; i++ )
    coll.insert({ _id : i })
   
st.shardColl( coll, { _id : 1 }, { _id : 0 } )

jsTestLog( "Sharded setup complete" )

st.printShardingStatus()

jsTestLog( "Setting initial versions for each mongos..." )

coll.find().itcount()

var collB = st.s1.getCollection( "" + coll )
collB.find().itcount()

jsTestLog( "Migrating via first mongos..." )

var fullShard = st.getShard( coll, { _id : 1 } )
var emptyShard = st.getShard( coll, { _id : -1 } )

var admin = st.s.getDB( "admin" )
assert.soon(
    function () {
        var result = admin.runCommand( { moveChunk: "" + coll,
                                         find: { _id: -1 },
                                         to: fullShard.shardName,
                                         _waitForDelete: true } );
        jsTestLog('moveChunk result = ' + tojson(result));
        return result.ok;
    },
    "Setup FAILURE:  Unable to move chunk from " + emptyShard.shardName +
            " to " + fullShard.shardName
);

jsTestLog( "Resetting shard version via first mongos..." )

coll.find().itcount()

jsTestLog( "Making sure we don't insert into the wrong shard..." )

collB.insert({ _id : -11 })

var emptyColl = emptyShard.getCollection( "" + coll )

print( emptyColl )
print( emptyShard )
print( emptyShard.shardName )
st.printShardingStatus()

assert.eq( 0, emptyColl.find().itcount() )

jsTestLog("DONE!");
st.stop();