[ZOOKEEPER-4425] 4lw Command: On demand snapshot - ASF JIRA

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Details

Type: New Feature
Status: Open
Priority: Minor
Resolution: Unresolved
Affects Version/s: None
Fix Version/s: None
Component/s: server
Labels:
- pull-request-available

Flags:

Patch
Language:
- Java

Description

Working with disaster recovery scenarios at work, we found that having the capacity of telling a ZooKeeper instance to take a snapshot, thus dumping into files the contents of its view of the internal database, could be a last resource hatch out of potential data loss.

As an example, imagine that all the voting members of the ensemble are wiped out due a wrong deployment configuration change. A single surviving observer could hold on its memory the last copy of most recently updated the ensemble data. Sending it a snap four letter words command that forced it to save a snapshot of that information into disk could be a very convenient way of recovering the database.

This issue aims to discuss the addition of this feature and serve as the gate for a an already available patch providing this feature.