49 lines
1.5 KiB
JavaScript
49 lines
1.5 KiB
JavaScript
// Tests whether a split and a migrate in a sharded cluster preserve the epoch
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var st = new ShardingTest( { shards : 2, mongos : 1 } )
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// Stop balancer, it'll interfere
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st.stopBalancer()
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var config = st.s.getDB( "config" )
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var admin = st.s.getDB( "admin" )
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var coll = st.s.getCollection( "foo.bar" )
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// First enable sharding
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admin.runCommand({ enableSharding : coll.getDB() + "" })
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st.ensurePrimaryShard(coll.getDB().getName(), 'shard0001');
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admin.runCommand({ shardCollection : coll + "", key : { _id : 1 } })
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var primary = config.databases.find({ _id : coll.getDB() + "" }).primary
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var notPrimary = null
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config.shards.find().forEach( function( doc ){ if( doc._id != primary ) notPrimary = doc._id } )
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var createdEpoch = null;
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var checkEpochs = function(){
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config.chunks.find({ ns : coll + "" }).forEach( function( chunk ){
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// Make sure the epochs exist, are non-zero, and are consistent
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assert( chunk.lastmodEpoch );
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print( chunk.lastmodEpoch + "" );
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assert.neq( chunk.lastmodEpoch + "", "000000000000000000000000" )
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if( createdEpoch == null ) createdEpoch = chunk.lastmodEpoch
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else assert.eq( createdEpoch, chunk.lastmodEpoch )
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})
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}
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checkEpochs();
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// Now do a split
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printjson( admin.runCommand({ split : coll + "", middle : { _id : 0 } }) )
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// Check all the chunks for epochs
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checkEpochs();
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// Now do a migrate
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printjson( admin.runCommand({ moveChunk : coll + "", find : { _id : 0 }, to : notPrimary }) )
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// Check all the chunks for epochs
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checkEpochs();
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st.stop()
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