Create zoo_append API
---------------------
Key: ZOOKEEPER-1396
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1396
Project: ZooKeeper
Issue Type: Improvement
Components: c client, java client, server
Reporter: Stephen Tyree
Priority: Minor
I was trying to append data to a znode from the C library and I realized the
workflow for that is pretty unfortunate. Essentially you need to do the
following:
- call zoo_exists to get the Stat structure which contains the data length of
the znode
- Allocate that many bytes plus how many you are adding to the znode
dynamically in a buffer
- call zoo_get to get the data for the znode
- append the data you are append'ing to the znode in your local buffer
- call zoo_set to set the data back into the znode
If between the zoo_set and the zoo_get the data changes, sorry! You have to
start from scratch. For a case where multiple consumers are trying to append
data to a znode, this can become a nuisance. If there existed a zoo_append API,
the workflow would become:
- call zoo_append to append the data into the znode
- If that fails, call zoo_set to create the znode with the data
Assuming zoo_append wouldn't create the znode. This would mean fewer round
trips against the server and simpler code. Even the Java library, which
wouldn't need to worry about calling zoo_exists, would have one fewer round
trip in the typical case.
Is this a typical workflow for people? Would anyone else find this API valuable?
--
This message is automatically generated by JIRA.
If you think it was sent incorrectly, please contact your JIRA administrators:
https://issues.apache.org/jira/secure/ContactAdministrators!default.jspa
For more information on JIRA, see: http://www.atlassian.com/software/jira
