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// Tests that merging chunks does not prevent cluster from doing other metadata ops
(function() {
'use strict';
var st = new ShardingTest({shards: 2});
var mongos = st.s0;
var admin = mongos.getDB("admin");
var coll = mongos.getCollection("foo.bar");
assert.commandWorked(admin.runCommand({enableSharding: coll.getDB() + ""}));
st.ensurePrimaryShard(coll.getDB() + "", st.shard0.shardName);
assert.commandWorked(admin.runCommand({shardCollection: coll + "", key: {_id: 1}}));
st.printShardingStatus();
// Split and merge the first chunk repeatedly
jsTest.log("Splitting and merging repeatedly...");
for (var i = 0; i < 5; i++) {
assert.commandWorked(admin.runCommand({split: coll + "", middle: {_id: i}}));
assert.commandWorked(
admin.runCommand({mergeChunks: coll + "", bounds: [{_id: MinKey}, {_id: MaxKey}]}));
printjson(mongos.getDB("config").chunks.find().toArray());
}
// Move the first chunk to the other shard
jsTest.log("Moving to another shard...");
assert.commandWorked(
admin.runCommand({moveChunk: coll + "", find: {_id: 0}, to: st.shard1.shardName}));
// Split and merge the chunk repeatedly
jsTest.log("Splitting and merging repeatedly (again)...");
for (var i = 0; i < 5; i++) {
assert.commandWorked(admin.runCommand({split: coll + "", middle: {_id: i}}));
assert.commandWorked(
admin.runCommand({mergeChunks: coll + "", bounds: [{_id: MinKey}, {_id: MaxKey}]}));
printjson(mongos.getDB("config").chunks.find().toArray());
}
// Move the chunk back to the original shard
jsTest.log("Moving to original shard...");
assert.commandWorked(
admin.runCommand({moveChunk: coll + "", find: {_id: 0}, to: st.shard0.shardName}));
st.printShardingStatus();
st.stop();
})();
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