[Gluster-devel] [geo-rep] Adding broken changelog into OLD htime file

[Saravanakumar Arumugam]

Hi,
Geo-replication make use of changelog translator (which is used to 
capture all I/O operations happening in a Volume and this happens per 
brick).
All the I/O operations happening are stored in 
.glusterfs/changelogs/CHANGELOG.TS (where TS is timestamp).
All successful changelogs(in a session) are getting logged into HTIME file.

Now, we have a case where the Brick can go down (for example some crash) 
and Changelog logging stops.

Consider, gluster volume is started again.
Now, the last CHANGELOG (which captured I/Os just before crash) is 
getting included into the new HTIME file.
This leads to inconsistent timings. The last CHANGELOG should have been 
included into the previous HTIME file.

I am planning to make changes in changelog translator so that the last 
CHANGELOG will be included
into the previous HTIME file.  It will be renamed as CHANGELOG.<Previous 
Changelog TS + 1>.

This will give better results when changes happened across a specific 
duration is asked for.

Please let me know your comments.

Thanks,
Saravana