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ChangeLog
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== 2016-10-07 version 0.9.2
* Use v08's strategy if resource limit is used (#55)
== 2016-09-23 version 0.9.1
* FOR UPDATE is not required while with GET_LOCK() (#54)
* Retry connect (#44)
== 2016-09-16 version 0.9.0
* Use UPDATE first strategy (#15)
* owner column is added for the table: migration is required
* AcquiredTask#timeout is the current value rather than at acquiring
* cancel_request is removed
* prefetch_break_types is removed
== 2016-08-02 version 0.8.49
* Revert v0.8.44 migration path (#38)
* v0.8.48's timeout express taks's life (#39)
* Use Sequel::UniqueConstraintViolation (#40)
* Merge v07 branch (#45)
== 2016-07-07 version 0.8.48
* Drop 2.0.0 support #33
* Show taken time of delete and acquire (#33)
* To ease the migration delete v0.8.44 finished tasks too (#34)
* Add stress test tool (#35)
* Fix cleanup interval count (#36)
== 2016-04-15 version 0.8.47
* require libraries before fork to help CoW
* add FORCE INDEX to acquiring UPDATE query to avoid wrong index
== 2016-03-23 version 0.8.46
* Introduce new timeout model
NOTE: this change requires migration process like actual DELETE query
see WHERE timeout <= now AND created_at IS NULL.
80946079a91dd89c8e371e9b3fdd7f4805c7e4f9
== 2015-12-02 version 0.8.45
* remove sqlite3 support
* fix #3
* add specs
* fix other trivial bugs
== 2015-10-07 version 0.8.44
* rdb_compat: Fix fair scheduling.
* rdb_compat: Use `GET_LOCK` instead of `LOCK TABLES` in MySQL.
== 2015-06-30 version 0.8.43
* child_process: stop after running
== 2015-06-16 version 0.8.42
* child_process: remove extra shutdown
== 2015-04-27 version 0.8.41
* ruby >= 2.0.0 support.
SignalQueue is obsolete because it does not run with ruby >= 2.0.0.
See ddbf04c9 and use SignalThread instead.
== 2014-10-08 version 0.8.40
* upgraded sequel v3.48.0
== 2014-09-05 version 0.8.39
* rdb_compat: 'DELETE' statement acquires table lock to avoid deadlocking
== 2014-05-29 version 0.8.38
* rdb_compat: 'UNLOCK TABLES' statement is submitted when use_connection_pooling is true.
== 2014-05-28 version 0.8.37
* rdb_compat: fixed a deadlock problem that rdb_compat doesn't unlock tables if it
uses connection pooling.
== 2014-05-21 version 0.8.36
* ThreadProcessor: fixed a problem that it takes next task even if TaskMonitor
stopped
== 2014-05-20 version 0.8.35
* child_process_monitor: fixed 'ps' command options
== 2014-05-20 version 0.8.34
* rdb_compat: use connection pooling. Users can specify as :use_connection_pooling
option. If connections use SSL, they are, by default, pooled. On the other hand,
if not, by default, connection pooling is not used.
== 2014-04-23 version 0.8.33
* Fixed nil variable exception at ChildProcessMonitor#try_join
== 2014-04-21 version 0.8.32
* Added SSL support for MySQL backend
== 2014-04-07 version 0.8.31
* Fixed ChildProcessMonitor to kill grandchildren
== 2014-04-07 version 0.8.30
* Fixed ChildProcessMonitor to kill grandchildren
== 2014-04-02 version 0.8.29
* Updated ChildProcessMonitor to kill grandchildren to not depend on
sys-proctable gem
== 2014-03-31 version 0.8.28
* Fixed ChildProcessMonitor when heartbeat pipe is closed
== 2014-03-31 version 0.8.27
* ChildProcessMonitor kills grandchildren as well when it force kills children.
== 2014-03-27 version 0.8.26
* Added delay before sending KILL signal to worker process when
a heartbeat pipe is closed or stopped
* Added child_heartbeat_kill_delay parameter
== 2014-02-18 version 0.8.25
* rdb_compat: submit method supports :compression => 'gzip' option
* rdb_compat: decompress gzipped data field automatically
== 2013-01-03 version 0.8.24
* rdb_compat: removed retry_count field
* Added AcquiredTask#update_data!
== 2013-01-03 version 0.8.23
* rdb_compat: added retry_count field
* Added Backend#release
== 2012-10-22 version 0.8.22
* rdb_compat backend fixed heartbeat method to check created_at properly
== 2012-09-11 version 0.8.21
* rdb_compat backend uses IS NOT NULL condition instead of >= because RANGE
partitioning of MySQL doesn't work with non-primary keys
== 2012-09-08 version 0.8.20
* Show log messages when a worker decides next status of a task (finished!,
release!, release! and cancel_request!)
== 2012-09-04 version 0.8.19
* rdb_compat backend uses >= 0 condition instead of IS NOT NULL to work with
RANGE partitioning of MySQL
== 2012-09-04 version 0.8.18
* rdb_compat backend uses table lock to avoid dead locks with InnoDB
* rdb_compat backend uses bulk cleanup to improve throughput
* rdb_compat backend uses created_at in WHERE clause to work with partitioning
* rdb_compat backend supports disable_resource_limit to improve acquire() performance
== 2012-09-03 version 0.8.17
* Increased wait time before starting processors to 1 second at average and
2 seconds at maximum
* rdb_compat backend waits random seconds after detecting deadlocks
== 2012-09-03 version 0.8.16
* Support task_prefetch option (default = 0, meaning no-prefetch)
* Wait 0.5 seconds before starting processors to avoid a spike of the
number of concurrent connections
* Increased default child_heartbeat_limit to 60 seconds
* Fixed a potential deadlock problem in shutdown process
* Fixed detach time wait
== 2012-08-30 version 0.8.15
* Improved detach process routines
== 2012-08-16 version 0.8.14
* Improved detach process routines
* Updated README.md
== 2012-08-10 version 0.8.13
* Force stop a processor when unknown exception occured during task heartbeat
== 2012-08-05 version 0.8.12
* Support 'process detach' feature for a replacement of binary replace
== 2012-08-05 version 0.8.11
* Support child_fork_frequency_limit option to wait before forking child
* Error messages include processor id and pid
* Don't check child process status if it's killing status is immediate-killing
== 2012-08-04 version 0.8.10
* rdb_backend returns max_running attribute
== 2012-08-03 version 0.8.9
* Use free slot ratio instead of free slot amount to decide task priorities
* Disable immediate binary replace on platforms which doesn't support SIGPWR
== 2012-07-26 version 0.8.8
* Use PWR instead of EMT signal which is not supported by ruby
* Fixed processor_id routine
== 2012-07-26 version 0.8.7
* Worker process changes process name ($0)
* Use EMT instead of WINCH signal for immediate binary replace
* Use WINCH instead of CONT signal for graceful binary replace
== 2012-07-23 version 0.8.6
* rdb_backend supports 'max_running' which is added in v0.7.21
* Fixed DaemonsLogger to use File::CREAT flag to open a file
* Show version when worker starts
== 2012-07-06 version 0.8.5
* Introduced PerfectQueue::Application::Decider
== 2012-07-03 version 0.8.3
* Fixed rdb_compat to raise PreemptedError
* Added PerfectQueue::Application::RouterDSL module for PerfectSched
== 2012-06-29 version 0.8.2
* 'process' type multiprocessor supports max_request_per_child option
* rdb_compat: heartbeat assumes UPDATE suceeded if 'timeout' is not changed
in case it was called within 1 second
* Child process ignores SIGCHLD
* Fixed Router not to match 'x' routing pattern with 'xy'
* Fixed child/task heartbeat timing calculation
== 2012-06-25 version 0.8.1
* Added autoload for PerfectQueue::VERSION
* Fixed backward compatiblity of the 'type' field in rdb_compat backend
* Added IdempotentAlreadyFinishedError and IdempotentAlreadyExistsError
which should be ignored for idempotency
== 2012-05-23 version 0.8.0
* New major version
* Redesigned API
== 2012-07-19 version 0.7.22
* Fixed RDBBackend SQL
== 2012-07-19 version 0.7.21
* Added max_running column for fair resource restriction
== 2012-01-24 version 0.7.20
* Fixed MonitorThread
== 2012-01-24 version 0.7.19
* Don't stop MonitorThread while shutting down
== 2012-01-15 version 0.7.18
* Fixed expiration logic
== 2012-01-10 version 0.7.17
* RDBBackend: disabled connection keepalive
== 2012-01-10 version 0.7.16
* RDBBackend: sleep 0.5 before retrying failed transaction by deadlock
* RDBBackend: release the row lock acquired by SELECT .. FOR UPDATE before retrying it
== 2012-01-10 version 0.7.15
* RDBBackend: Fixed locking routines to work with possibility of deadlocks
== 2012-01-08 version 0.7.14
* Re-enabled order of the tasks
* RDBBackend: Fixed table locking routine
== 2011-12-18 version 0.7.13
* Don't guarantee the order of the tasks to improve performance
== 2011-12-18 version 0.7.12
* Added -D, --delete-wait option
== 2011-12-18 version 0.7.11
* Optimized a SQL of RDBBackend
== 2011-12-17 version 0.7.8, 0.7.9, 0.7.10
* Supports resource limit
== 2011-12-08 version 0.7.7
* RDBBackend doesn't create table automatically
* Fix nil errors
== 2011-12-06 version 0.7.6
* NullBackend always returns success
== 2011-12-04 version 0.7.5
* Added NullBackend
* RDBBackend considers URLs begin with jdbc::mysql
* Reduced MAX_SELECT_ROW from 32 to 4 to reduce backend load
* SimpleDBBackend#list ignores finished task
== 2011-11-02 version 0.7.3
* Disables logger's buffering
* Fixed time format in --list message
== 2011-09-16 version 0.7.2
* Supported --env argument
== 2011-08-31 version 0.7.1
* Fixed kill behavior
* Supported to read multiple configuration files
* Optimized --list subcommand
== 2011-08-31 version 0.7.0
* Backend uses logical delete instead of deleting tasks when task is finished
or canceled. It surely raises error when duplicated job id is submitted.
== 2011-08-25 version 0.6.1
* Supports SimpleDB Backend
== 2011-08-23 version 0.6.0
* First release