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From "Sylvain Lebresne (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-8817) Error handling in Cassandra logs in low memory scenarios could use improvement
Date Thu, 25 Feb 2016 11:04:18 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-8817?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15167079#comment-15167079
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Sylvain Lebresne commented on CASSANDRA-8817:
---------------------------------------------

I don't think trying to guess some random minimal amount of memory required is a good idea.
The one thing here that I can agree we may want to look at is why C* crashes without logging
any error, assuming that this is indeed what happened.

> Error handling in Cassandra logs in low memory scenarios could use improvement
> ------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-8817
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-8817
>             Project: Cassandra
>          Issue Type: Improvement
>         Environment: Ubuntu 14.04, VM originally created with 1 GB RAM, DSE 4.6.0 installed
>            Reporter: Michael DeHaan
>            Priority: Minor
>              Labels: lhf
>             Fix For: 2.1.x
>
>
> When running Cassandra with a low amount of RAM, in this case, using DataStax Enterprise
4.6.0 in a reasonably default configuration, I find that I get an error after starting and
trying to use nodetool, namely that it cannot connect to 127.0.0.1.   Originally this sends
me up a creek, looking for why Cassandra is not listening on 7199.  The truth ends up being
a bit more cryptic - that Cassandra isn't running.
> Upon looking at the Cassandra system logs, I see the last thing that it did was print
out the (very long) class path.   This confused me as basically I'm seeing no errors in the
log at all.
> I am proposing that Cassandra should check the amount of available RAM and issue a warning
in the log, or possibly an error, because in this scenario Cassandra is going to oomkill and
probably could have predicted this in advance.
> Something like:
> "Found X MB of RAM, expecting at least Y MB of RAM, Z MB recommended, may crash, adjust
<SETTINGS>" or something similar would be a possible solution.



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