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Eric Evans commented on CASSANDRA-4638:
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{quote}
Please note that the wish to use automatically the 64-bit JVM is not only no
Solaris, I would like to see the same feature on Linux or other operating
systems on which cassandra may run and which may use a downloaded version of
the JVM.
As far as I remember even cassandra was telling in the log files that a 64bit
JVM shall be used.
{quote}
The way this is supposed to work is that (whenever possible), you properly
configure the system for the version of Java you are using; The desired Java
binary should be in the path. When this isn't possible, the {{$JAVA_HOME}}
environment variable can be used to infer the location.
We use {{$JAVA_HOME}} here because it is a _very_ widely used convention, and
something that people are familiar with. This is the first report I'm aware of
where {{$JAVA_HOME/bin/java}} wouldn't work.
TL;DR Linux doesn't have this issue.
I propose [this alternate
patch|https://issues.apache.org/jira/secure/attachment/12604822/4638.patch]
instead. It's effectively the same, but implements a search list which is
(hopefully) easier to grok, and will be easier to extend if we have to add more
alternatives.
> Patch to bin/cassandra to use 64bit JVM if available
> ----------------------------------------------------
>
> Key: CASSANDRA-4638
> URL: https://issues.apache.org/jira/browse/CASSANDRA-4638
> Project: Cassandra
> Issue Type: Improvement
> Components: Core
> Affects Versions: 1.1.4
> Environment: Tested on Solaris 11 with Oracle supplied JVM 1.6 and 1.7
> Reporter: Bernhard Roth
> Labels: 64bit, linux, solaris
> Attachments: 4638.patch, cassandra.patch
>
> Original Estimate: 0.25h
> Remaining Estimate: 0.25h
>
> Cassandra uses by default the JAVA binary at $JAVA_HOME/bin and complains at
> start that the 64bit version should be used.
> Well, even if the 64bit JAVA version is installed, cassandra still does not
> use it.
> Attached patch solves this problem by checking if $JAVA_HOME/bin/amd64/java
> binary exists. If yes, it will be used for cassandra.
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