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Diffstat (limited to 'doc/todo/cheaper_global_fsck.mdwn')
| -rw-r--r-- | doc/todo/cheaper_global_fsck.mdwn | 38 |
1 files changed, 0 insertions, 38 deletions
diff --git a/doc/todo/cheaper_global_fsck.mdwn b/doc/todo/cheaper_global_fsck.mdwn deleted file mode 100644 index 70d1380a2..000000000 --- a/doc/todo/cheaper_global_fsck.mdwn +++ /dev/null @@ -1,38 +0,0 @@ -Global fsck updates all location log entries for a repo. This wastes disk -space. - -I realized now that it can be implemented w/o such waste. Probably cheaply -enough to be the default! - -What we need is a new log file, call it fscktimes.log. -This records the time of the last fsck of each repo. - -`git annex fsck --expire` no longer needs to look at the location log at -all. It can just check the repo's fscktimes.log entry. If the entry is -recent enough, we know that the repo has fscked recently, and its location -log is good, and nothing needs to be done. Otherwise, we know that the repo -has stopped fscking, and we simply expire *all* its location logs. - -Note that fscktime.log is only used by fsck; it does not impact git-annex -generally or make it slower. And, it's very low overhead to update the one -file. Repos could do a fsck --fast on a daily basis and not grow the -git-annex branch much. Maybe on an hourly basis even. - -(BTW, there is some overlap with the fsck.log file that is currently used to -hold the timestamp of the last local fsck. May be able to eliminate that -file too.) - ----- - -It might be worth making the fsck.log record --fast and full fscks -separately so we know the last of each for each repo. This would let ---expire require periodic full fscks and more frequent fast fscks. - ----- - -Hmm, --expire updates all the location logs when it thinks a repo has gone -missing. Why not just mark it dead? Again, this would save a lot of space! -It would complicate recovery if a repo had been offline and came back; it -would need to mark itself as not dead any longer. - -> [[done]] --[[Joey]] |