Re: Snapshot SSTable modified??

Oh, thanks Elliott for the explanation! I had no idea about that little tidbit concerning ctime. Now it all makes sense! - Max > On May 28, 2018, at 10:24 pm, Elliott Sims wrote: > > Unix timestamps are a bit odd. "mtime/Modify" is file changes, > "ctime/Change/(sometimes called create)"

Re: Snapshot SSTable modified??

Unix timestamps are a bit odd. "mtime/Modify" is file changes, "ctime/Change/(sometimes called create)" is file metadata changes, and a link count change is a metadata change. This seems like an odd decision on the part of GNU tar, but presumably there's a good reason for it. When the original

Re: Snapshot SSTable modified??

I looked at the source code for GNU tar, and it looks for a change in the create time or (more likely) a change in the size. This seems very strange to me — I would think that creating a snapshot would cause a flush and then once the SSTables are written, hardlinks would be created and the

Re: Snapshot SSTable modified??

I've run across this problem before - it seems like GNU tar interprets changes in the link count as changes to the file, so if the file gets compacted mid-backup it freaks out even if the file contents are unchanged. I worked around it by just using bsdtar instead. On Thu, May 24, 2018 at 6:08

Re: Snapshot SSTable modified??

Jeff, Shouldn't Snapshot get consistent state of sstables? -tmp file shouldn't impact backup operation right? Regards, Nitan K. Cassandra and Oracle Architect/SME Datastax Certified Cassandra expert Oracle 10g Certified On Wed, May 23, 2018 at 6:26 PM, Jeff Jirsa wrote: >

Re: Snapshot SSTable modified??

In versions before 3.0, sstables were written with a -tmp filename and copied/moved to the final filename when complete. This changes in 3.0 - we write into the file with the final name, and have a journal/log to let uss know when it's done/final/live. Therefore, you can no longer just watch for

Snapshot SSTable modified??

Hi Everyone, We’ve noticed a few times in the last few weeks that when we’re doing backups, tar has complained with messages like this: tar: /var/lib/cassandra/data/mars/test_instances_by_test_id-6a9440a04cc111e8878675f1041d7e1c/snapshots/backup_20180523_024502/mb-63-big-Data.db: file changed