ActiveMQ问题分析和解决是怎样的，针对这个问题，这篇文章详细介绍了相对应的分析和解答，希望可以帮助更多想解决这个问题的小伙伴找到更简单易行的方法。
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官方：
From 5.3 onwards - we recommend you use KahaDB - which offers improved scalability and recoverability over the AMQ Message Store.
The AMQ Message Store which although faster than KahaDB - does not scales as well as KahaDB and recovery times take longer.
非官方：
kaha文件系统实际上上是一个文件索引系统，有两部分组成，一个是数据文件系统，由一个个独立的文件组成，缺省文件大小是32M大（可配置），另外一个是索引文件系统，记录消息在数据文件中的位置信息以及数据文件中的空闲块信息。数据文件是存储到硬盘上的，索引文件是缓存在内存中的。所以这个存储系统对大消息存储有利，象我们的memberId之类的文本消息，实际上是浪费，索引比消息还大，哈。
我方分析：
推荐： Amq持久方式
理由：虽然官方推荐使用KahaDB持久方式，但其提到的优势：可伸缩性和恢复性较好，对于我们实际的应用意义不大。从我们自己的使用经验来看，KahaDB持久方式，Data文件是一个大文件（感觉文件过大后，造成队列服务瘫死的可能性会增大），从官网的相关配置（附录1）也找不到哪里可以设置数据的文件的最大Size。）而Amq持久方式可以设置Data文件最大Size，这样可以保证即时消息积压很多，Data文件也不至于过大。
解决方法：
在建立连接的Uri中加入： wireFormat.maxInactivityDuration=0
参考资源：
http://jinguo.iteye.com/blog/243153
You can do the following to fix the issues:
1) Append max inactivity duration to your Uri in the format below: wireFormat.maxInactivityDuration=0
2) Use the same Uri at the client side as well as at the server side
Regards,
如果不这样设置，对应的错误会出现：
2008-05-07 09:22:56,343 [org.apache.activemq.ActiveMQConnection]-[WARN] Async exception with no exception listener: org.apache.activemq.transport.InactivityIOException: Channel was inactive for too long: localhost/127.0.0.1:61616
org.apache.activemq.transport.InactivityIOException: Channel was inactive for too long: localhost/127.0.0.1:61616
ActiveMQ的tcp url：tcp://localhost:61616后面要加入?wireFormat.maxInactivityDuration=0 这样的参数，否则当一段时间没有消息发送时会抛出 "Channel was inactive for too long"异常
解决方法：
1）关闭ActiveMqLog4j
打开：conf/log4j.properties
将：log4j.rootLogger=INFO, console, logfile
修改为：log4j.rootLogger=OFF
2）在建立连接的Uri中加入： maxInactivityDurationInitalDelay=30000
例如北京的测试环境连接Uri：
tcp://192.168.199.80:61616?wireFormat.maxInactivityDuration=0&maxInactivityDurationInitalDelay=30000&connection.AsyncSend=true
参考资源：
http://activemq.apache.org/javaxjmsjmsexception-wire-format-negociation-timeout-peer-did-not-send-his-wire-format.html
If you get exception like this,it can mean one of three things:
1. You're connecting to the port not used by ActiveMQ TCP transport
Make sure to check that you're connecting to the appropriate host:port
2. You're using log4j JMS appender and doesn't filter out ActiveMQ log messages
Be sure to read How do I use log4j JMS appender with ActiveMQ and more importantly to never send ActiveMQ log messages to JMS appender
3. Your broker is probably under heavy load (or network connection is unreliable), so connection setup cannot be completed in a reasonable time
If you experience sporadic exceptions like this, the best solution is to use failover transport, so that your clients can try connecting again if the first attempt fails. If you're getting these kind of exceptions more frequently you can also try extending wire format negotiation period (default 10 sec). You can do that by using wireFormat.maxInactivityDurationInitalDelay property on the connection URL in your client.
For example
tcp://localhost:61616?wireFormat.maxInactivityDurationInitalDelay=30000
will use 30 sec timeout.（貌似有问题！！！）
解决方法：
1） 设置Java最大内存限制为合适大小：
Bin/activemq.bat 中ACTIVEMQ_OPTS=-Xmx512M（默认是512）
2）Activemq.xml配置节：systemUsage/ systemUsage配置大小合适，并且特别注意：大于所有durable desitination设置的memoryUsage之和。
备注：
1）尖括号：“>”代表通配符
2）ACTIVEMQ_OPTS的配置〉=memoryUsage中配置〉=所有durable desitination设置之和
3）SystemUsage配置设置了一些系统内存和硬盘容量，当系统消耗超过这些容量设置时，amq会“slow down producer”，还是很重要的。
参考资料：
http://m.oschina.net/blog/26216
参考-- http://activemq.apache.org/javalangoutofmemory.html
对于MQ的内容实用是可管理和可配置的。首先需要判断的是MQ的哪部分系统因内存不足而导致泄漏，是JVM，broker还是消费者、生产者？
一、内存管理
JVM内存管理：
1. 用bin/activemq命令在独立JVM中运行broker。用-Xmx和-Xss命令即可（activemq.bat文件中修改ACTIVEMQ_OPTS选项参数即可）；
2. 默认情况下，MQ用512M的JVM；
broker内存管理：
1. broker使用的内存并不是由JVM的内存决定的。虽然受到JVM的限制，但broker确实独立管理器内存；
2. systemUsage和destination的内存限制与broker内存息息相关；
3. MQ中内存的关系是：JVM->Broker->broker features;
4. 所有destination的内存总量不能超过broker的总内存；
消费者：
1. 由于消息大小可以配置，prefetch limit往往是导致内存溢出的主要原因；
2. 减少prefetch limit的大小，会减少消费者内存中存储的消息数量；
生产者：
1. 除非消息数量超过了broker资源的限制，否则生产者不会导致内存溢出；
2. 当内存溢出后，生产者会收到broker的阻塞信息提示；
二、其他
将消息缓冲之硬盘：
1. 只有当消息在内存中存储时，才允许消息的快速匹配与分发，而当消费者很慢或者离开时，内存可能会耗尽；
2. 当destination到达它的内存临界值时，broker会用消息游标来缓存非持久化的消息到硬盘。
3. 临界值在broker中通过memoryUsage和systemUsage两个属性配置，请参考activemq.xml；
4. 对于缓慢的消费者，当尚未耗尽内存或者转变为生产者并发控制模式前，这个特性允许生产者继续发送消息到broker；
5. 当有多个destination的时候，默认的内存临界值可能被打破，而这种情况将消息缓存到硬盘就显得很有意义；
6. precentUsage配置：使用百分比来控制内存使用情况；
多个线程：
1. 默认情况下，MQ每个destination都对应唯一的线程；
2. -Dorg.apache.activema.UseDedicatedTaskRunner=false（activemq.bat文件中修改ACTIVEMQ_OPTS选项参数即可），用线程池来限制线程的数量，从而减少内存消耗;
大数据传输：
1. destination policies--maxPageSize：控制进入内存中的消息数量；lazyDispatch:增加控制使用当前消费者列表的预取值；
2. 使用blogMessage或者streamsMessage类型来进行大量文件的传输；
泄漏JMS资源：
1. 当session或者producer或者consumer大量存在而没有关闭的时候；
2. 使用PooledConnectionFactory；
解决方法：
不采用failover连接
分析：
采用failover方式连接，如果所要连接的服务器或者Activemq服务宕了，那么程序会一直处于等待状态，不超时，不报错。
property name | default value | Comments |
directory | activemq-data | the path to the directory to use to store the message store data and log files |
indexWriteBatchSize | 1000 | number of indexes written in a batch |
indexCacheSize | 10000 | number of index pages cached in memory |
enableIndexWriteAsync | false | if set, will asynchronously write indexes |
journalMaxFileLength | 32mb | a hint to set the maximum size of the message data logs |
enableJournalDiskSyncs | true | ensure every non transactional journal write is followed by a disk sync (JMS durability requirement) |
cleanupInterval | 30000 | time (ms) before checking for a discarding/moving message data logs that are no longer used |
checkpointInterval | 5000 | time (ms) before checkpointing the journal |
ignoreMissingJournalfiles | false | If enabled, will ignore a missing message log file |
checkForCorruptJournalFiles | false | If enabled, will check for corrupted Journal files on startup and try and recover them |
checksumJournalFiles | false | create a checksum for a journal file - to enable checking for corrupted journals |
Available since version 5.4: | ||
archiveDataLogs | false | If enabled, will move a message data log to the archive directory instead of deleting it. |
directoryArchive | null | Define the directory to move data logs to when they all the messages they contain have been consumed. |
databaseLockedWaitDelay | 10000 | time (ms) before trying to get acquire a the database lock (used by shared master/slave) |
maxAsyncJobs | 10000 | the maximum number of asynchronous messages that will be queued awaiting storage (should be the same as the number of concurrent MessageProducers) |
concurrentStoreAndDispatchTopics | false | enable the dispatching of Topic messages to interested clients to happen concurrently with message storage |
concurrentStoreAndDispatchQueues | true | enable the dispatching of Queue messages to interested clients to happen concurrently with message storage |
property name | default value | Comments |
directory | activemq-data | the path to the directory to use to store the message store data and log files |
useNIO | true | use NIO to write messages to the data logs |
syncOnWrite | false | sync every write to disk |
maxFileLength | 32mb | a hint to set the maximum size of the message data logs |
persistentIndex | true | use a persistent index for the message logs. If this is false, an in-memory structure is maintained |
maxCheckpointMessageAddSize | 4kb | the maximum number of messages to keep in a transaction before automatically committing |
cleanupInterval | 30000 | time (ms) before checking for a discarding/moving message data logs that are no longer used |
indexBinSize | 1024 | default number of bins used by the index. The bigger the bin size - the better the relative performance of the index |
indexKeySize | 96 | the size of the index key - the key is the message id |
indexPageSize | 16kb | the size of the index page - the bigger the page - the better the write performance of the index |
directoryArchive | archive | the path to the directory to use to store discarded data logs |
archiveDataLogs | false | if true data logs are moved to the archive directory instead of being deleted |
property name | default value | Comments |
memoryUsage | 20M | amq使用内存大小，照amq论坛上说，这个值应该大于所有durable desitination设置的 memoryUsage之和，否则会导致硬盘swap，影响性能。 |
storeUsage | 1G | kaha数据存储大小，如果设置不足，性能会下降到1个1个发 |
tempUsage | 100M | 非persistent的消息存储在temp区域 |
http://activemq.apache.org/nms/configuring.html
Option Name | Default | Description |
transport.timeout | -1 | Time that a send operation blocks before failing. |
transport.initialReconnectDelay | 10 | Time in Milliseconds that the transport waits before attempting to reconnect the first time. |
transport.maxReconnectDelay | 30000 | The max time in Milliseconds that the transport will wait before attempting to reconnect. |
transport.backOffMultiplier | 2 | The amount by which the reconnect delay will be multiplied by if useExponentialBackOff is enabled. |
transport.useExponentialBackOff | true | Should the delay between connection attempt grow on each try up to the max reconnect delay. |
transport.randomize | true | Should the Uri to connect to be chosen at random from the list of available Uris. |
transport.maxReconnectAttempts | 0 | Maximum number of time the transport will attempt to reconnect before failing (0 means infinite retries) |
transport.startupMaxReconnectAttempts | 0 | Maximum number of time the transport will attempt to reconnect before failing when there has never been a connection made. (0 means infinite retries) (included in NMS.ActiveMQ v1.5.0+) |
transport.reconnectDelay | 10 | The delay in milliseconds that the transport waits before attempting a reconnection. |
transport.backup | false | Should the Failover transport maintain hot backups. |
transport.backupPoolSize | 1 | If enabled, how many hot backup connections are made. |
transport.trackMessages | false | keep a cache of in-flight messages that will flushed to a broker on reconnect |
transport.maxCacheSize | 256 | Number of messages that are cached if trackMessages is enabled. |
transport.updateURIsSupported | true | Update the list of known brokers based on BrokerInfo messages sent to the client. |
Option Name | Default | Description |
connection.AsyncSend | false | Are message sent Asynchronously. |
connection.AsyncClose | true | Should the close command be sent Asynchronously |
connection.AlwaysSyncSend | false | Causes all messages a Producer sends to be sent Asynchronously. |
connection.CopyMessageOnSend | true | Copies the Message objects a Producer sends so that the client can reuse Message objects without affecting an in-flight message. |
connection.ProducerWindowSize | 0 | The ProducerWindowSize is the maximum number of bytes in memory that a producer will transmit to a broker before waiting for acknowledgement messages from the broker that it has accepted the previously sent messages. In other words, this how you configure the producer flow control window that is used for async sends where the client is responsible for managing memory usage. The default value of 0 means no flow control at the client. See also Producer Flow Control |
connection.useCompression | false | Should message bodies be compressed before being sent. |
connection.sendAcksAsync | false | Should message acks be sent asynchronously |
connection.messagePrioritySupported | true | Should messages be delivered to the client based on the value of the Message Priority header. |
connection.dispatchAsync | false | Should the broker dispatch messages asynchronously to the connection's consumers. |
Option Name | Default | Description |
wireFormat.stackTraceEnabled | false | Should the stack trace of exception that occur on the broker be sent to the client? Only used by openwire protocol. |
wireFormat.cacheEnabled | false | Should commonly repeated values be cached so that less marshalling occurs? Only used by openwire protocol. |
wireFormat.tcpNoDelayEnabled | false | Does not affect the wire format, but provides a hint to the peer that TCP nodelay should be enabled on the communications Socket. Only used by openwire protocol. |
wireFormat.sizePrefixDisabled | false | Should serialized messages include a payload length prefix? Only used by openwire protocol. |
wireFormat.tightEncodingEnabled | false | Should wire size be optimized over CPU usage? Only used by the openwire protocol. |
wireFormat.maxInactivityDuration | 30000 | The maximum inactivity duration (before which the socket is considered dead) in milliseconds. On some platforms it can take a long time for a socket to appear to die, so we allow the broker to kill connections if they are inactive for a period of time. Use by some transports to enable a keep alive heart beat feature. Set to a value <= 0 to disable inactivity monitoring. |
maxInactivityDurationInitalDelay | 10000 | The initial delay in starting the maximum inactivity checks (and, yes, the word 'Inital' is supposed to be misspelled like that) |
1、控制台安全配置，打开conf/jetty.xml文件，找到
将“false”改为“true”即可。用户名和密码存放在conf/jetty-realm.properties文件中。
2、生产者和消费者连接MQ需要密码
打开conf/activemq.xml文件，在
注意必须在
用户名和密码存放在conf/credentials.properties文件中
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