弹性搜索部分快照的工作原理

Question

If I keep on taking snapshots , and lets assume the first two snapshots ended up in being partial snapshots and third one succeeds , then can I delete those partial snapshots and be able to restore everything from the third snapshot? Or do i need to keep all the snapshots ?

Will I be able to just refer to the third snapshots for restoring indices [elastic will look it up for me in partial snapshots if not present in the final one? ] or do I need to go explicitly to those partial snapshots for some of the indices to be restored?

fullsnap-201902 PARTIAL 1547497447  20:24:07   1547498721 20:45:21    21.2m     163               417             6          423
fullsnap-201903 PARTIAL 1547498746  20:45:46   1547499531 20:58:51      13m     163               420             3          423
fullsnap-201904 SUCCESS 1547500210  21:10:10   1547500864 21:21:04    10.8m     163               423             0          423

Answer 1

A PARTIAL snapshot indicates an error condition, more precisely that the data for some shard could not be backed up. So before attempting any restore you should first investigate why those partial snapshots happens in the first place by looking at the failure section of the snapshot response.

If you attempt to restore a PARTIAL snapshot (using partial: true ), then shards that could not be snapshotted in the first place will be recreated empty, which is probably not what you're looking for.

To sum up:

1. I would first investigate why your snapshot was PARTIAL
2. I would only try to restore snapshots that ended up in SUCCESS