Announcing Metrics-Scala 3.0.0

Metrics-scala 3.0.0 was just released and is available in Maven central. This is the first release against Metrics version 3.0.0, and the first release where the code is maintained by me instead of being a line for line copy of Coda Hales' original.

A special thanks goes to @scullxbones who started the 3.0.0 branch and ported the tests to ScalaTest.

Changes:

• Code is no longer a copy from Coda Hale's sources and is now maintained by me.
• Depends on Metrics-core 3.0.0.
• Ported tests from original to ScalaTest (@scullxbones).
• Much more documentation.

Although the metrics-scala API is mostly source compatible, there are breaking API changes which are mostly caused by changes in the metrics-core library:

• All code moved to the nl.grons.metrics.scala package (changed at Coda Hale's request).
• The class Instrumented must now be created in your project by extending InstrumentedBuilder.
• All configuration for histograms, meters, and timers are gone. These are now configured in the reporter.
• Dropped method clear on Histogram and Timer.

More ideas and pull requests are welcome!

Fast directory transfer on Unix machines

Here is a little trick to transfer a big folder from one unix machine to another in 2 variations.

In this variation netcat is in listen mode on the target (execute in the given order):

on target> nc -l 19001 | lzop -d | tar x on source> tar c [directory to copy] | lzop | nc [target] 19001

In the second variation netcat is in listen mode on the source system (again, execute in the given order):

on source> tar c [directory to copy] | lzop | nc -l 19001 on target> nc [source] 19001 | lzop -d | tar x

Make sure you have a decent network connection, 1 Gbit/s is fine.

Update 2015-11-18: I experimented with cpio and found that it is a lot faster then tar. I also added pipe viewer (pv) to get some sense of when a transfer is done.

This is using cpio with netcat in listen mode on the target and send mode on the source:

on target> nc -l 19001 | lzop -d | cpio -idm on source> cd [directory to copy]; find . -depth -print0 | cpio -o0 \ | pv -s $(du -ks . | awk '{print $1}')k \ | lzop | nc [target] 19001

This is what it looks like on the source side: