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From Andrey Gura <ag...@apache.org>
Subject Re: Ignite on FreeBSD 11 and OpenJDK
Date Mon, 10 Apr 2017 10:24:18 GMT

could you please share core dump file? If not, it would be helpful to
know what is CPU architecture on this server.

On Mon, Apr 10, 2017 at 2:53 AM, Kamil Misuth <kimec@ethome.sk> wrote:
> Greetings,
> OpenJDK (7 and 8) HotSpot JVM SIGSEGVs on FreeBSD 11 as soon as node joins a
> topology and starts to communicate via DirectNioClientWorker.
> The root cause is DirectByteBufferStreamImpl (both versions) which uses
> GridUnsafe.getXXX/putXXX(Object object, offset, value) methods to manipulate
> DirectByteBuffer, whereas it should really be using
> GridUnsafe.getXXX/putXXX(address, value), since DirectByteBuffer is
> allocated on C heap (off java heap).
> Notice that at least one instance of the same problem is known to exist in
> another project using Unsafe
> https://issues.apache.org/jira/browse/CASSANDRA-8325 .
> The OpenJDK source of Unsafe is more or less clear on this
> http://hg.openjdk.java.net/jdk8u/jdk8u60/jdk/file/935758609767/src/share/classes/sun/misc/Unsafe.java#l391
> I have prepared a simple fix here
> https://github.com/apache/ignite/compare/1.9.0-rc2...kimec:freebsd-support .
> However, I am not sure if the solution is right in regard to overall ignite
> performance.
> I've tried to compile ignite-core with tests and after applying my changes
> was able to pass all the basic stuff until the performance test stage at
> which point my machine run out of RAM and swap space (some 10 GB)... Not
> sure if this is how the tests are supposed to be. After compiling with
> -DskipTests I was able to create FreeBSD 11 - CentOS 7 two node cluster and
> everything seemed OK (the two nodes shared an IGFS instance backed by
> replicated caches).
> Please note that OpenJDK on different systems as well as Oracle JDK (via
> Linux compatility layer) on FreeBSD seem to be more forgiving and does not
> I've based my branch on 1.9.0-rc2 since tag 1.9.0 has already POM with
> version 2.0.
> Kamil

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