For starting up cluster easy with docker-compose.
And unify Dockerfile and scripts to be able to work with docker-compose
and the old one dev_patroni_cluster.sh script
It was causing patroni failing to stop after receiving SIGTERM.
Acceptance tests was killing it with SIGKILL which was causing further tests fail because postgres was still running:
2016-06-16 14:36:24,444 INFO: no action. i am the leader with the lock
2016-06-16 14:36:25,448 INFO: Lock owner: postgres0; I am postgres0
2016-06-16 14:36:25,452 ERROR: Failed to update /service/batman/optime/leader
Traceback (most recent call last):
File "/home/akukushkin/git/patroni/patroni/dcs/zookeeper.py", line 208, in write_leader_optime
self._client.retry(self._client.set, path, last_operation)
File "/home/akukushkin/git/patroni/py2/local/lib/python2.7/site-packages/kazoo/client.py", line 273, in _retry
return self._retry.copy()(*args, **kwargs)
File "/home/akukushkin/git/patroni/py2/local/lib/python2.7/site-packages/kazoo/retry.py", line 123, in __call__
return func(*args, **kwargs)
File "/home/akukushkin/git/patroni/py2/local/lib/python2.7/site-packages/kazoo/client.py", line 1219, in set
return self.set_async(path, value, version).get()
File "/home/akukushkin/git/patroni/py2/local/lib/python2.7/site-packages/kazoo/handlers/utils.py", line 74, in get
self._condition.wait(timeout)
File "/usr/lib/python2.7/threading.py", line 340, in wait
waiter.acquire()
File "/home/akukushkin/git/patroni/patroni/utils.py", line 219, in sigterm_handler
sys.exit()
SystemExit
2016-06-16 14:36:25,453 INFO: no action. i am the leader with the lock
2016-06-16 14:36:26,443 INFO: Lock owner: postgres0; I am postgres0
2016-06-16 14:36:26,444 INFO: no action. i am the leader with the lock
Class implementing AbstractDCS must have name similar to the module
name. I.e. Patroni will load ZooKeeper from zookeeper.py, but not from
exhibitor.py, although it (ZooKeeper) is also available there.
It returns copy of `effective_configuration`.
Don't check that PATRONI_*_USERNAME and PATRONI_*_PASSWORD are set
together. User may want to set only PASSWORD.
These parameters usually must be the same across all cluster nodes and
therefore must be set only via global configuration and always passed as
a list of postgres arguments (via pg_ctl) to make it not possible
accidentally change them by 'ALTER SYSTEM'
Originally Exhibitor was supported in the ZooKeeper class and
configuration for Exhibitor was taken also from `zookeeper` section in
the yaml config file. In fact, Exhibitor just extends ZooKeeper and now
it is reflected in the code and also Exhibitor got it's own section in
the config.yaml file. It will make it easier to configure Exhibitor
hosts and port via environment variables when PR#211 will be merged.
And some other tricks with overriding handle_one_request and finish
methods from the parent class which were necessary only to make OPTIONS
request from haproxy work with python2, but in fact it was still not
working with python3. Instead of doing all the magic we should simply
give to haproxy what it wants to get: HTTP response code and nothing
more.
It should not call `recover` but `state_handler.follow` directly
(like it is already done in the `clone`).
Otherwise it tries to create a new thread and all async functionality
became borken...
where it is not necessary (test_ha, test_ctl, etc...)
It will simplyfy further refactoring and make it possible to install
implementations of AbstractDCS independant of each other.
Originally we were passing postgresql options as an argument of `pg_ctl
start`. It was nice and convenient because doesn't require to touch
configuration files but this method has one significant drawback: it
wasn't possible to change values of options which were passed as an
arguments without restart (event for the case when option reqires only
reload). Instead of doing that (passing options as arguments) we will:
1) rename original postgresql.conf to postgresql-base.conf
2) write options into postgresql.conf which has `include
'postgresql-base.conf'` on the the third line after comment that this
file is generated by Patroni and you should not change it manually
3) listen_addresses and port are still passed as an arguments to the
pg_ctl (just to be foolproof against ALTER SYSTEM set port to 'random')
In addition to that this commit makes some attributes of `Postgresql`
class private (prefixes them with _)
Somehow when you import only urllib3 it's not possible work with
urllib3.exceptions.HTTPError exception (it looks like it is imported
from some other place. from urllib3.exceptions import HTTPError solves
the problem.
All responses to the client sent by single method `_write_response`
encode('utf-8') is done only inside this method. It make easier to
support existing code because eliminates need to put b'' everywhere
Mostly this tag is necessary to give a hint to load balancer
auto-configuration tool that node should not be included into
LB configuration.
In addition to that Patroni also should not return status_code=200
for a health check if the tag is present and value is not `False`.
Until now get_dcs method was doing absolutely the same job as method
from Patroni class.
In addition to that I did small refactoring and clean up of unit tests
Alexander Kukushkin