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From "Trevor Robinson (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HADOOP-8659) Native libraries must build with soft-float ABI for Oracle JVM
Date Tue, 07 Aug 2012 20:42:11 GMT
Trevor Robinson created HADOOP-8659:
---------------------------------------

             Summary: Native libraries must build with soft-float ABI for Oracle JVM
                 Key: HADOOP-8659
                 URL: https://issues.apache.org/jira/browse/HADOOP-8659
             Project: Hadoop Common
          Issue Type: Bug
          Components: native
         Environment: armhf Linux with Oracle JVM
            Reporter: Trevor Robinson
            Assignee: Trevor Robinson


There was recently an ABI (application binary interface) change in most Linux distributions
for modern ARM processors (ARMv7). Historically, hardware floating-point (FP) support was
optional/vendor-specific for ARM processors, so for software compatibility, the default ABI
required that processors with FP units copy FP arguments into integer registers (or memory)
when calling a shared library function. Now that hardware floating-point has been standardized
for some time, Linux distributions such as Ubuntu 12.04 have changed the default ABI to leave
FP arguments in FP registers, since this can significantly improve performance for FP libraries.

Unfortunately, Oracle has not yet released a JVM (as of 7u4) that supports the new ABI, presumably
since this involves some non-trivial changes to components like JNI. While the soft-float
JVM can run on systems with multi-arch support (currently Debian/Ubuntu) using compatibility
libraries, this configuration requires that any third-party JNI libraries also be compiled
using the soft-float ABI. Since hard-float systems default to compiling for hard-float, an
extra argument to GCC (and installation of a compatibility library) is required to build soft-float
Hadoop native libraries that work with the Oracle JVM.

Note that OpenJDK on hard-float systems does use the new ABI, and expects JNI libraries to
use it as well. Therefore the fix for this issue requires detecting the float ABI of the current
JVM.

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