KahaDB配置

http://activemq.apache.org/kahadb.html

KahaDB Properties

property name

default value

Comments

directory

activemq-data

the path to the directory to use to store the message store data and log files

IndexDirectory

 

If set, configures where the KahaDB index files will be stored. If not set, the index files are stored in the directory specified by the 'directory' attribute.

Available as of ActiveMQ 5.10

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 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 true_v5.9

create a checksum for a journal file - to enable checking for corrupted journals

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.

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 (Warning: Enabling this property is not recommended)

concurrentStoreAndDispatchQueues

true

enable the dispatching of Queue messages to interested clients to happen concurrently with message storage

archiveCorruptedIndex

false

If enabled, corrupted indexes found at startup will be archived (not deleted)

preallocationStrategy

sparse_file

(as of 5.12.0) This setting configures how the broker will try to preallocate the journal files when a new journal file is needed. The default allocation strategy sets the file length, but does not populate it with any data. The 'os_kernel_copy' strategy delegates the preallocation to the Operating System. The 'zeros' strategy configures ActiveMQ to do the preallocation by writing 0x00 to all of the positions in the journal file.