New CLI tool to convert from cluster to standalone

[eolivelli]

FEATURE REQUEST

1. Please describe the feature you are requesting.

In order to help debugging issues in production clusters it would be good to have some tool to download data from a cluster and create a local standalone server that contains a given tablespace.

We can have these situations:

• download only metadata from ZooKeeper and convert WAL from BookKeeper
• download even a snapshot from a running leader (this is available only in case the system is up and running)
• use a local snapshot taken from a server part of the cluster (follower or leader)

2. Indicate the importance of this issue to you (blocker, must-have, should-have, nice-to-have). Are you currently using any workarounds to address this issue?

should-have

3. Provide any additional detail on your proposed use case for this feature.

It is almost impossible to reproduce in DEV environment production problems because you cannot create a ZIP file from ZK + BK + local snapshot