ACTIVEMQ use Notes (ii) ACTIVEMQ message Persistence One

Original address: http://www.huaishao8.com/config/activemq/122.html

Set the property persistent= "true" in broker (the default is True) and the message sent at the same time should be persitent type. There are three ways of ACTIVEMQ message persistence: AMQ, KAHADB, and JDBC. 1, Amq

AMQ is a form of file storage, which has the characteristics of fast writing speed and easy recovery. Messages are stored in one file, the default size of the file is 32 megabytes, and if the size of a message exceeds 32 trillion, the value must be set to a larger point. When a message in a storage file is consumed, the file is identified as removable, and the file is deleted during the next cleanup phase. The default configuration is as follows:
< Persistenceadapter >
< Amqpersistenceadapter directory = "Activemq-data" maxfilelength = "32MB"/>
</persistenceadapter >

Properties of AMQ:

Property name	Default value	Describe
Directory	Activemq-data	Storage directory for message files and logs
Usenio	True	Storing messages using the NIO protocol
Synconwrite	False	Write to disk synchronously, this option has a very high performance impact
Maxfilelength	32mb	The size of a message file
Persistentindex	True	Persistence of the message index, if False, so that the index is saved in memory
Maxcheckpointmessageaddsize	4kb	Maximum number of messages allowed for a transaction
CleanupInterval	30000	Clear operation Cycle, Unit MS
Indexbinsize	1024	Index file cache number of pages, the default is 1024, when the AMQ expansion or reduced storage, will lock the entire broker, resulting in a certain amount of time blocking, so this value should be adjusted to relatively large, but the implementation of the code will be dynamic scaling, the adjustment effect is not ideal.
Indexkeysize	96	Size of index key, key is message ID
Indexpagesize	16kb	Page size of index
Directoryarchive	Archive	Storing archived message file directories
Archivedatalogs	False	When true, archived message files are moved to directoryarchive instead of being deleted directly

ACTIVEMQ Use Notes (ii) ACTIVEMQ message Persistence two Original Address: http://www.huaishao8.com/config/activemq/132.html

KAHADB

KAHADB is a file-based local database storage format, although not amq fast, but it has strong scalability, recovery time than AMQ, from the 5.4 version after the KAHADB as the default persistent way. The default configuration is as follows:
< Persistenceadapter >
< kahadb directory = "Activemq-data" journalmaxfilelength = "32MB"/>
</persistenceadapter >

Properties of KAHADB:

Property name	Default value	Comments
Directory	Activemq-data	Storage directory for message files and logs
Indexwritebatchsize	1000	The size of a batch of indexes, updated to the message file when the amount of index to be updated reaches this value
Indexcachesize	10000	In memory, the page size of the index
Enableindexwriteasync	False	Whether the index is written asynchronously to the message file
Journalmaxfilelength	32mb	The size of a message file
Enablejournaldisksyncs	True	Whether to write asynchronous messages to disk
CleanupInterval	30000	Clear operation Cycle, Unit MS
Checkpointinterval	5000	Index writes to the message file's cycle, Unit ms
Ignoremissingjournalfiles	False	Ignore missing message file, False, when missing message file, start exception
Checkforcorruptjournalfiles	False	Check that the message file is corrupted, true, and check that the corruption will attempt to repair
Checksumjournalfiles	False	Generates a checksum to be able to detect damage to the journal file.
Properties that are valid after version 5.4: