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使用記憶體大小，照amq論壇上說，這個值應該大於所有durable desitination設定的

memoryUsage之和，否則會導致硬碟swap，影響效能。

storeUsage

1G

kaha資料儲存大小，如果設定不足，效能會下降到1個1個發

tempUsage

100M

非persistent的訊息儲存在temp區域

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

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 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)