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Update dcs.py

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Alexander Kukushkin
2015-08-11 12:01:21 +02:00
parent e51ea4c1ca
commit 4940665cea
1 changed files with 4 additions and 4 deletions
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helpers/dcs.py
+4 -4
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@@ -90,12 +90,12 @@ class AbstractDCS:
"""Update leader key (or session) ttl and `/optime/leader` key in DCS.
:param state_handler: reference to `Postgresql` object
:returns: `!True` if leader lock (or session) has been updated successfully.
:returns: `!True` if leader key (or session) has been updated successfully.
If not, `!False` must be returned and current instance would be demoted.
If you failed to update `/optime/leader` this error is not critical and you can return `!True`
You have to use CAS operation on order to update leader key, for example for etcd `prevValue`
parameter have to be used."""
You have to use CAS (Compare And Swap) operation in order to update leader key,
for example for etcd `prevValue` parameter must be used."""
@abc.abstractmethod
def attempt_to_acquire_leader(self):
@@ -103,7 +103,7 @@ class AbstractDCS:
This method should create `/leader` key with value=`~self._name`
:returns: `!True` if key has been created successfully.
Key has to be created atomically. In case if key already exists it should not be
Key must be created atomically. In case if key already exists it should not be
overwritten and `!False` must be returned"""
def current_leader(self):