By default, haproxy sens an OPTION request, which we didn't
handle until now. In addition, all haproxy requests that doesn't
examine the request body close the connection as soon as the status
code is obtained. Such behavior breaks BaseHTTPRequestHandler,
namely handle_one_request, which doesn't check for connection reset
by peer and throw this error on a higher level, but since we don't
call this function directly, there is no place in the code to catch
it, therefore, we have to patch this function in the base class.
In addition, patch the StreamRequestHandler finish() function in
order to handle the connection reset error.
Re-read the cluster from DCS right after the failover to supply
the correct new values to the API thread. Fix a typo.
In the initial implementation we were using the only option
--encoding=UTF8. In order to have pg_rewind working with postgresql-9.3
we have to enable data-checksums. The naive approach was to enable it
globaly but taking into account some performance degradation it's better
not to do it but make it possible to configure it.
In addition to that fix all problems with setting up password of default
postgres user: execute CREATE ROLE | ALTER ROLE depending on content of
pg_authid
The initialize key was checked against the value
of the node name before removal, but it was changed
recently to contain either an empty string, or cluster
sysid. To fix this, the check for the previous value
was simply removed: we can guarantee that the code path
that removes the key is the one that created it.
If the namespace is not specified in a config file /service/ would be
used.
Also it's possible to use just '/' as a namespace. It means we would
have following structure:
/scope1
/scope2
...
Such situation could happen if we replaced all etcd nodes except one
which was used by patroni. After replacing the last node patroni will
try to execute request on all other nodes from machines_cache but non of
them are available. Michines cache would became empty and patroni will
stick to the latest node which was available in the machines_cache and
will never try to refresh machines_cache from dns for example.
Currently machines cache is refreshed only when one request to the etcd
cluster has failed, but probably it should be done periodically, for
example every minute...
One can use pgpass configuration parameter in the postgres
subsection of Patroni. By default pgpass is written in ~/.
Mock actual writes to pgpass in the tests.
Alexander Kukushkin