Peter Szecsi created ZOOKEEPER-3361:
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Summary: Add multi version of getChildren request
Key: ZOOKEEPER-3361
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-3361
Project: ZooKeeper
Issue Type: Improvement
Components: java client, server, tests
Reporter: Peter Szecsi
Assignee: Peter Szecsi
There is already a multi operation for \{{delete, create, setData}}... However,
\{{getChildren}} has no version of getting the children of multiple nodes by
one message.
This could heavily improve the efficiency of a traversal (e.g. breadth-first
search) when the latency is high (>1ms). In this case, a simple \{{deleteAll}}
algorithm on 10k nodes takes at least (1ms * 10000 * 2 =) 20 sec, only to
acquire the list of the nodes selected for deleting (it has to check for every
node whether it has children or not).
I would add a version of \{{getChildren}} function to the ZooKeeper API which
accepts lists as well (containing node paths) and returns their children and
introduce a new request type. This way the backward compabilty would not be
hurt but ZK could provide a more robust solution for those who may have latency
issues.
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