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From "Roger Schildmeijer (JIRA)" <>
Subject [jira] Commented: (CASSANDRA-1053) Expose setting of phi in the FailureDetector
Date Wed, 05 May 2010 19:52:04 GMT


Roger Schildmeijer commented on CASSANDRA-1053:

Summary from irc discussion.
   * will a phi knob scare people of?
   * will people change the knob without understanding how big the implication will be (e.g
from 8 to 16)

> Expose setting of phi in the FailureDetector
> --------------------------------------------
>                 Key: CASSANDRA-1053
>                 URL:
>             Project: Cassandra
>          Issue Type: Improvement
>    Affects Versions: 0.6
>            Reporter: Brandon Williams
>            Priority: Trivial
> I've seen some users, always on cloud platforms, say that they have problems with hosts
flapping in the FD.  GC is not the cause.  I know of at least one production deployment where
they are already hacking phi to 10 to get around the flapping problems.
> This is a dangerous thing to expose, however, since giving meaning to the difference
of 8 and 10 here is hard to quantify to someone unfamiliar with the inner workings.  Perhaps
we can allow setting it in the config, but not specify a default and leave it commented out
with a big fat warning.

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