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/**
* Where we test operations dealing with large chunks
*
* This test is labeled resource intensive because its total io_write is 220MB compared to a median
* of 5MB across all sharding tests in wiredTiger. Its total io_write is 1160MB compared to a median
* of 135MB in mmapv1.
* @tags: [resource_intensive]
*/
(function() {
'use strict';
// Starts a new sharding environment limiting the chunk size to 1GB (highest value allowed).
// Note that early splitting will start with a 1/4 of max size currently.
var s = new ShardingTest({name: 'large_chunk', shards: 2, other: {chunkSize: 1024}});
var db = s.getDB("test");
//
// Step 1 - Test moving a large chunk
//
// Turn on sharding on the 'test.foo' collection and generate a large chunk
assert.commandWorked(s.s0.adminCommand({enablesharding: "test"}));
s.ensurePrimaryShard('test', 'shard0001');
var bigString = "";
while (bigString.length < 10000) {
bigString += "asdasdasdasdadasdasdasdasdasdasdasdasda";
}
var inserted = 0;
var num = 0;
var bulk = db.foo.initializeUnorderedBulkOp();
while (inserted < (400 * 1024 * 1024)) {
bulk.insert({_id: num++, s: bigString});
inserted += bigString.length;
}
assert.writeOK(bulk.execute());
assert.commandWorked(s.s0.adminCommand({shardcollection: "test.foo", key: {_id: 1}}));
assert.eq(1, s.config.chunks.count({"ns": "test.foo"}), "step 1 - need one large chunk");
var primary = s.getPrimaryShard("test").getDB("test");
var secondary = s.getOther(primary).getDB("test");
// Make sure that we don't move that chunk if it goes past what we consider the maximum chunk
// size
print("Checkpoint 1a");
var max = 200 * 1024 * 1024;
assert.throws(function() {
s.adminCommand({
movechunk: "test.foo",
find: {_id: 1},
to: secondary.getMongo().name,
maxChunkSizeBytes: max
});
});
// Move the chunk
print("checkpoint 1b");
var before = s.config.chunks.find({ns: 'test.foo'}).toArray();
assert.commandWorked(
s.s0.adminCommand({movechunk: "test.foo", find: {_id: 1}, to: secondary.getMongo().name}));
var after = s.config.chunks.find({ns: 'test.foo'}).toArray();
assert.neq(before[0].shard, after[0].shard, "move chunk did not work");
s.config.changelog.find().forEach(printjson);
s.stop();
})();
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