Pablo Francisco Pérez Hidalgo created ZOOKEEPER-4425:
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Summary: 4lw Command: On demand snapshot
Key: ZOOKEEPER-4425
URL: https://issues.apache.org/jira/browse/ZOOKEEPER-4425
Project: ZooKeeper
Issue Type: New Feature
Components: server
Reporter: Pablo Francisco Pérez Hidalgo
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.
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