Upgrade lz4-java to 1.5.0

[patelh]

The current version of lz4-java is using lz4 r123 release and the latest version of 1.5.0 is using 1.8.3 which claims to have speed improvements. lz4 r123 is from 09/2014. lz4 release notes show speed up for high compression of up to 10% and decompression speed up of 10%.

From change log:

Upgraded LZ4 to 1.8.3. Updated JNI bindings for Linux/amd64,
   Linux/ppc64le, Linux/s390x, Linux/aarch64, and Mac OS Darwin/x86_64.
   A speed-up is expected on these platforms.
   Note that the JNI bindings for Linux/i386 and Win32 still work
   but are based on old LZ4 r123. Contributions of the JNI
   bindings for these and other platforms are more than welcome.

[drcrallen]

Here's a partial flame graph from some of our hot nodes. I'll be excited if the lz4 decrypt is faster. Even 10% would be good

[b-slim]

@drcrallen keep us posted !

[drcrallen]

Looking at just the mean topN segment scan times for non-zero reported scan times, this change seems to indicate an approximately 13% improvement in performance for 1.5.0 vs 1.3.0 in a real cluster.

Pretty solid and easy upgrade.

[patelh]

@drcrallen Nice! Did you notice any improvement in indexing/merging time ?

[patelh]

@drcrallen @b-slim @clintropolis @gianm any idea which release this change will be part of?

[clintropolis]

It will be part of the upcoming 0.14 release, which I believe we plan to start the process at the end of the month.