Raul Gutierrez Segales created ZOOKEEPER-2051:
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Summary: Creating ephemeral znodes from within a transaction fail
with local sessions
Key: ZOOKEEPER-2051
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-2051
Project: ZooKeeper
Issue Type: Bug
Components: server
Affects Versions: 3.5.0
Reporter: Raul Gutierrez Segales
Assignee: Raul Gutierrez Segales
Priority: Critical
Fix For: 3.5.1
With local sessions enabled, the premise is that as soon as you try to create
an ephemeral znode your session will be upgraded to global. The problem is that
the session upgrade logic doesn't intercept transactions. So creating an
ephemeral znode from within a transaction fails with SessionExpired.
A small example with Kazoo:
{noformat}
from kazoo.client import KazooClient
k = KazooClient("localhost:2181")
k.start()
t = k.transaction()
t.create("/hello_", "", ephemeral=True)
t.commit()
[kazoo.exceptions.SessionExpiredError((), {})]
{noformat}
A workaround, for now, is to create an ephemeral before your transaction which
forces your session to be upgraded.
Possible solutions could be:
* extending zookeeper_init() so that you can request global=True
* and/or, providing an upgradeSession() API
Thoughts?
cc: [~thawan], [~phunt], [~fpj]
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