mongodb查询很慢

Question

我有一个每秒执行数百个事务的多线程应用程序，但一段时间后性能下降并且查询执行时间过长。我一直致力于使用以下代码优化连接以避免错误，但这会导致性能不佳。

我的查询因插入、删除和多次更新而异；集合不超过 100,000 行。

我有一个由 4 个用于 mongoldb 的 VM 组成的集群，每个 VM 在 Azure 上都有 4 个内核和 28GB 内存。我使用 bitnami 生产构建了集群 (https://azure.microsoft.com/en-us/marketplace/partners/bitnami/production-mongodbdefault/)

private static MongoClientOptions options = MongoClientOptions.builder()
.connectionsPerHost(1000)
.threadsAllowedToBlockForConnectionMultiplier(15)
.connectTimeout(60 * 1000)
.maxWaitTime(60 * 1000)
.socketTimeout(60 * 1000)
.connectTimeout(60 * 1000)
.build();

我没有使用任何索引，这是我的应用流程：

1. 我正在使用数据库故事来排队和处理消息。每个作业都保存在一个单独的集合中，每个 msg 都有一个如下所示的文档（此阶段的 msg 状态为“准备就绪”）：

{
"_id": ObjectId("57cd303743ffe80f3728fcf5"),
"_class": "com.mongodb.BasicDBObject",
"job_id": "57cd3031d9991f8639487013",
"priority": 1,
"title": "1",
"sender_id": "sender 1",
"account_id": "57c2d556d9991fbc15897275",
"schedule_date": ISODate("2016-09-05T08:43:00Z"),
"utf8": false,
"content": "text to be sent",
"number": "962799000001",
"status": "ready",
"user_id": "57c2d602d9991fbc1589727b",
"adv": true,
"number_of_sms_msgs": 1,
"uuid": "57cd3031d9991f8639487013_57cd303743ffe80f3728fcf5",
"msg_id": "1955559517"
}

1. 然后，我根据每个作业的优先级将批次从“就绪”状态转移到“已排队”，并将它们添加到内存队列以进行处理：

List<DBObject> batch = scaffoldingRepository.findPageNoSort(dataType, page, next_batch_size, query, null);
if (batch != null && batch.size() > 0) {    
    BasicDBList ids = new BasicDBList();
    for (final DBObject msg : batch) {
        msg.put("status", "queued");
        msg.put("uuid", job_id + "_" + msg.get("_id"));
        ids.add(new ObjectId(msg.get("_id").toString()));
    }
    BasicDBObject search = new BasicDBObject();
    search.put("_id", new BasicDBObject("$in", ids));
    BasicDBObject update = new BasicDBObject();
    update.put("$set", new BasicDBObject("status", "queued"));
    scaffoldingRepository.updateObjects(search, update, dataType);
}

1. 然后另一个线程从内存队列中发送实际的消息，并分别更新每个消息的状态（发送/失败）；我在一个单独的表中为此消息添加了一个索引，以便在发件人将最终状态发回给我后我可以找到它。
2. 最后，我从发件人那里得到了关于 msg（已传递/未传递）的最终结果，我相应地更新了这个 msg，然后在上一步中从 (job_index) 集合中删除索引。

=========================== 更新：======================

我注意到我在 Java 日志中收到了这个错误：

com.mongodb.MongoSocketReadTimeoutException: Timeout while receiving message
at com.mongodb.connection.InternalStreamConnection.translateReadException(InternalStreamConnection.java:475)
at com.mongodb.connection.InternalStreamConnection.receiveMessage(InternalStreamConnection.java:226)
at com.mongodb.connection.UsageTrackingInternalConnection.receiveMessage(UsageTrackingInternalConnection.java:105)
at com.mongodb.connection.DefaultConnectionPool$PooledConnection.receiveMessage(DefaultConnectionPool.java:438)
at com.mongodb.connection.WriteCommandProtocol.receiveMessage(WriteCommandProtocol.java:262)
at com.mongodb.connection.WriteCommandProtocol.execute(WriteCommandProtocol.java:104)
at com.mongodb.connection.UpdateCommandProtocol.execute(UpdateCommandProtocol.java:64)
at com.mongodb.connection.UpdateCommandProtocol.execute(UpdateCommandProtocol.java:37)
at com.mongodb.connection.DefaultServer$DefaultServerProtocolExecutor.execute(DefaultServer.java:168)
at com.mongodb.connection.DefaultServerConnection.executeProtocol(DefaultServerConnection.java:289)
at com.mongodb.connection.DefaultServerConnection.updateCommand(DefaultServerConnection.java:143)
at com.mongodb.operation.UpdateOperation.executeCommandProtocol(UpdateOperation.java:76)
at com.mongodb.operation.BaseWriteOperation$1.call(BaseWriteOperation.java:142)
at com.mongodb.operation.BaseWriteOperation$1.call(BaseWriteOperation.java:134)
at com.mongodb.operation.OperationHelper.withConnectionSource(OperationHelper.java:232)
at com.mongodb.operation.OperationHelper.withConnection(OperationHelper.java:223)
at com.mongodb.operation.BaseWriteOperation.execute(BaseWriteOperation.java:134)
at com.mongodb.operation.BaseWriteOperation.execute(BaseWriteOperation.java:61)
at com.mongodb.Mongo.execute(Mongo.java:827)
at com.mongodb.Mongo$2.execute(Mongo.java:810)
at com.mongodb.DBCollection.executeWriteOperation(DBCollection.java:333)
at com.mongodb.DBCollection.updateImpl(DBCollection.java:495)
at com.mongodb.DBCollection.update(DBCollection.java:455)
at com.mongodb.DBCollection.update(DBCollection.java:432)
at com.mongodb.DBCollection.update(DBCollection.java:522)
at com.mongodb.DBCollection.updateMulti(DBCollection.java:552)
at java.util.TimerThread.mainLoop(Timer.java:555)
at java.util.TimerThread.run(Timer.java:505)

这是我的 Mongodb 配置：

# mongod.conf
# for documentation of all options, see:
#   http://docs.mongodb.org/manual/reference/configuration-options/

# Where and how to store data.
storage:
  dbPath: /opt/bitnami/mongodb/data/db
  journal:
    enabled: true
    #engine:
  mmapv1:
    smallFiles: true
#  wiredTiger:

# where to write logging data.
systemLog:
  destination: file
  logAppend: true
  path: /opt/bitnami/mongodb/logs/mongodb.log

# network interfaces
net:
  port: 27017
  bindIp: 0.0.0.0
  unixDomainSocket:
    enabled: true
    pathPrefix: /opt/bitnami/mongodb/tmp

# replica set options
replication: 
  replSetName: replicaset

# process management options
processManagement:
   fork: false
   pidFilePath: /opt/bitnami/mongodb/tmp/mongodb.pid

# set parameter options
setParameter:
   enableLocalhostAuthBypass: true

# security options
security:
  authorization: disabled
  #keyFile: replace_me

#profiling
#operationProfiling:
  #slowOpThresholdMs: 100
  #mode: slowOp

Answer 1

小贴士

-在 MongoDB 分析器中，您是否检查了运行缓慢的查询。

-您是否尝试为文档编制索引（使用上述步骤中的输入）

-您使用的是哪个版本的 MongoDB，哪个是存储引擎。

-您是否完成了服务器的复制。如果是，请重新访问写关注部分https://docs.mongodb.com/manual/core/replica-set-write-concern/

-能否检查一下mongodb in-memory implementation是否可以帮助https://docs.mongodb.com/manual/core/inmemory/

-您可以在这里看到一些重要提示 - https://docs.mongodb.com/manual/administration/analyzing-mongodb-performance/