grastate.dat and other percona xtradb cluster files not properly addressed in documentation

[Mario Splivalo]

There is no explanation on what grastate.dat file contain, under what circumstances it is created, is it ever removed, and so on. The documentation on the web (http://www.percona.com/doc/percona-xtradb-cluster/5.5/wsrep-files-index.html) states that the file is there, shows its content, but there is no explanation on what various fields do.

For instance, seqno: describes the last 'written' sequence number for that particular node. I'm only assuming that -1 means some sort of an error, but I am not 100% clear on what 0 is - is it that the cluster was never written to since the bootstrap, or just since the reboot of that particular unit?

An explanation/description of those in the PXC manual is, imho, essential.

[Hrvoje Matijakovic (hrvojem)]

Fixed here: https://github.com/percona/documentation/pull/20