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// Tests whether a split and a migrate in a sharded cluster preserve the epoch
var st = new ShardingTest({shards: 2, mongos: 1});
// Balancer is by default stopped, thus it will not interfere
var config = st.s.getDB("config");
var admin = st.s.getDB("admin");
var coll = st.s.getCollection("foo.bar");
// First enable sharding
admin.runCommand({enableSharding: coll.getDB() + ""});
st.ensurePrimaryShard(coll.getDB().getName(), 'shard0001');
admin.runCommand({shardCollection: coll + "", key: {_id: 1}});
var primary = config.databases.find({_id: coll.getDB() + ""}).primary;
var notPrimary = null;
config.shards.find().forEach(function(doc) {
if (doc._id != primary)
notPrimary = doc._id;
});
var createdEpoch = null;
var checkEpochs = function() {
config.chunks.find({ns: coll + ""}).forEach(function(chunk) {
// Make sure the epochs exist, are non-zero, and are consistent
assert(chunk.lastmodEpoch);
print(chunk.lastmodEpoch + "");
assert.neq(chunk.lastmodEpoch + "", "000000000000000000000000");
if (createdEpoch == null)
createdEpoch = chunk.lastmodEpoch;
else
assert.eq(createdEpoch, chunk.lastmodEpoch);
});
};
checkEpochs();
// Now do a split
printjson(admin.runCommand({split: coll + "", middle: {_id: 0}}));
// Check all the chunks for epochs
checkEpochs();
// Now do a migrate
printjson(admin.runCommand({moveChunk: coll + "", find: {_id: 0}, to: notPrimary}));
// Check all the chunks for epochs
checkEpochs();
st.stop();
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