[tor-dev] Metrics tarballs now available as .tar.xz rather than .tar.bz2

[Karsten Loesing <karsten@xxxxxxxxxxxxxx>]

Hello all,

we switched the compression format for metrics tarballs.  They are now
available as .tar.xz (compressed with `xz -9`), with the previous format
being .tar.bz2 (compressed with `bzip2 -1`).

The effect is that the total size of metrics tarballs shrinks from 212G
to 33G.  The savings in disk space and bandwidth were too tempting, even
though compression and decompression are going to cost some more CPU and
memory.

The data page now contains links to .tar.xz tarballs:

https://metrics.torproject.org/data.html

However, the .tar.bz2 tarballs will still be provided for another two
months until July 17, 2014.  This includes already existing and newly
created tarballs.

All the best,
Karsten
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