block_compressor_options.js

/**
 * Tests using different combinations of --wiredTigerCollectionBlockCompressor and
 * --wiredTigerJournalCompressor.
 *
 * Using the collection block compressor option will result in all new collections made during
 * that process lifetime to use that compression setting. WiredTiger perfectly supports different
 * tables using different block compressors. This test will start up MongoDB once for each block
 * compressor setting and a create a new collection. Then after all collections are created, check
 * creation string passed to WT via the collStats command.
 *
 * WiredTiger also supports changing the compression setting for writes to the journal. This tests
 * that the setting can be changed between clean restarts, but otherwise does not verify the
 * journal compression behavior.
 *
 * @tags: [requires_persistence,requires_wiredtiger]
 */
// On the first iteration, start a mongod. Subsequent iterations will close and restart on the
// same dbpath.
let firstIteration = true;
let compressors = ['none', 'snappy', 'zlib', 'zstd'];
let mongo;
for (let compressor of compressors) {
    jsTestLog({"Starting with compressor": compressor});
    if (firstIteration) {
        mongo = MongoRunner.runMongod({
            wiredTigerCollectionBlockCompressor: compressor,
            wiredTigerJournalCompressor: compressor
        });
        firstIteration = false;
    } else {
        MongoRunner.stopMongod(mongo);
        mongo = MongoRunner.runMongod({
            restart: true,
            dbpath: mongo.dbpath,
            cleanData: false,
            wiredTigerCollectionBlockCompressor: compressor
        });
    }
    mongo.getDB('db')[compressor].insert({});
}

for (let compressor of compressors) {
    jsTestLog({"Asserting collection compressor": compressor});
    let stats = mongo.getDB('db')[compressor].stats();
    assert(stats['wiredTiger']['creationString'].search('block_compressor=' + compressor) > -1);
}

MongoRunner.stopMongod(mongo);