RE: How to enable JNA for Cassandra on Windows?
I found that there's no C library under Windows, and msvcrt does not provide
mlockall function, so currently there's no way to use JNA under Windows. That
way mmap is not a good idea?
Best regards/ Pagarbiai
Viktor Jevdokimov
Senior Developer
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 3063. Fax: +370 5 261 0453
J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
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From: Viktor Jevdokimov [mailto:vjevdoki...@gmail.com]
Sent: Thursday, September 22, 2011 15:01
To: user@cassandra.apache.org
Subject: How to enable JNA for Cassandra on Windows?
Hi,
I'm trying without success to enable JNA for Cassandra on Windows.
Tried to place JNA 3.3.0 libs jna.jar and platform.jar into Cassandra 0.8.6 lib
dir, but getting in log:
Unable to link C library. Native methods will be disabled.
What is missed or what is wrong?
One thing I've found on inet about JNA and Windows is this sample:
// Library is c for unix and msvcrt for windows
String libName = c;
if (System.getProperty(os.namehttp://os.name).contains(Windows))
{
libName = msvcrt;
}
// Loading dynamically the library
CInterface demo = (CInterface) Native.loadLibrary(libName, CInterface.class);
from http://www.scriptol.com/programming/jna.php
while in Cassandra:
try
{
Native.register(c);
}
catch (NoClassDefFoundError e)
{
logger.infohttp://logger.info(JNA not found. Native methods will be
disabled.);
}
catch (UnsatisfiedLinkError e)
{
logger.infohttp://logger.info(Unable to link C library. Native
methods will be disabled.);
}
catch (NoSuchMethodError e)
{
logger.warn(Obsolete version of JNA present; unable to register C
library. Upgrade to JNA 3.2.7 or later);
}
Is it true that for Windows Cassandra should do something like:
if (System.getProperty(os.namehttp://os.name).contains(Windows))
{
Native.register(msvcrt);
}
else
{
Native.register(c);
}
Thanks
Viktor
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Re: How to enable JNA for Cassandra on Windows?
mmap is supported by the JDK, jna is not required.
On Fri, Sep 23, 2011 at 5:07 AM, Viktor Jevdokimov
viktor.jevdoki...@adform.com wrote:
I found that there‘s no C library under Windows, and msvcrt does not
provide mlockall function, so currently there‘s no way to use JNA under
Windows. That way mmap is not a good idea?
** **
** **
**
** **
Best regards/ Pagarbiai
** **
*Viktor Jevdokimov*
Senior Developer
** **
Email: viktor.jevdoki...@adform.com
Phone: +370 5 212 3063. Fax: +370 5 261 0453
J. Jasinskio 16C, LT-01112 Vilnius, Lithuania
** **
** **
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Disclaimer: The information contained in this message and attachments is
intended solely for the attention and use of the named addressee and may be
confidential. If you are not the intended recipient, you are reminded that
the information remains the property of the sender. You must not use,
disclose, distribute, copy, print or rely on this e-mail. If you have
received this message in error, please contact the sender immediately and
irrevocably delete this message and any copies.
*From:* Viktor Jevdokimov [mailto:vjevdoki...@gmail.com]
*Sent:* Thursday, September 22, 2011 15:01
*To:* user@cassandra.apache.org
*Subject:* How to enable JNA for Cassandra on Windows?
** **
Hi,
** **
I'm trying without success to enable JNA for Cassandra on Windows.
** **
Tried to place JNA 3.3.0 libs jna.jar and platform.jar into Cassandra 0.8.6
lib dir, but getting in log:
Unable to link C library. Native methods will be disabled.
** **
What is missed or what is wrong?
** **
One thing I've found on inet about JNA and Windows is this sample:
** **
// Library is c for unix and msvcrt for windows
String libName = c;
if (System.getProperty(os.name).contains(Windows))
{
libName = msvcrt;
}
// Loading dynamically the library
CInterface demo = (CInterface) Native.loadLibrary(libName, CInterface.class);
** **
from http://www.scriptol.com/programming/jna.php
** **
while in Cassandra:
** **
try
{
Native.register(c);
}
catch (NoClassDefFoundError e)
{
logger.info(JNA not found. Native methods will be disabled.);
}
catch (UnsatisfiedLinkError e)
{
logger.info(Unable to link C library. Native methods will be
disabled.);
}
catch (NoSuchMethodError e)
{
logger.warn(Obsolete version of JNA present; unable to register C
library. Upgrade to JNA 3.2.7 or later);
}
** **
Is it true that for Windows Cassandra should do something like:
** **
if (System.getProperty(os.name).contains(Windows))
{
Native.register(msvcrt);
}
else
{
Native.register(c);
}
** **
** **
Thanks
Viktor
--
Jonathan Ellis
Project Chair, Apache Cassandra
co-founder of DataStax, the source for professional Cassandra support
http://www.datastax.com
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