Stephen Tyree created ZOOKEEPER-1705:
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Summary: Certain implementations of C's rand() function coupled
with the shuffle in libzookeeper_mt's getaddrs() produce a biased distribution
of connections.
Key: ZOOKEEPER-1705
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-1705
Project: ZooKeeper
Issue Type: Bug
Components: c client
Reporter: Stephen Tyree
Priority: Minor
Using libzookeeper_mt on an unsupported platform (OpenVMS) with a 5 server
connection string, the fourth server in the connection string gets selected
approximately only 6% of the time. This appears to be due to some strange
properties of the LCG used in OpenVMS's C rand() function. Linux does not
exhibit this behavior, but I can't speak for Windows, BSD, etc.
It would be prudent, if libzookeeper_mt's behavior is intended to be the same
on every platform it operates on (not that OpenVMS is one of those platforms),
to use a PRNG of its own choosing. Integrating a defined PRNG, such as the
mersenne twister, would give all platforms the same, correct behavior.
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