apache/pinot

Tool for migrating from one deep store to another

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#7,275 opened on Aug 10, 2021

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 (4 comments) (0 reactions) (0 assignees)Java (1,234 forks)batch import
good first issuehelp wanted

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Description

A use case for this is, say someone started with controller local as deep store, and then wants to migrate to using Azure as deep store. If they enable this, the newer segments will use Azure as deep store, but the older segments will still remain on controller local disk. The only way to move the old segments is to manually copy them over to Azure, and then modify the segment zk metadata.

An admin tool for migrating from deep store X to Y would be handy.

Contributor guide

Research direction
Explore the Pinot source code to understand how deep stores are configured and how segments are stored. Look at the SegmentMetadata and ZK metadata handling. Then design a command line tool that can list segments in old store and copy to new store, updating metadata.
Tech stack
java
Domain
backenddevops
Issue type
Feature
DifficultyEstimated implementation difficulty for a new contributor, from 1 for very small changes to 5 for expert-level work.
3
Estimated timeA rough time range for an experienced contributor to investigate, implement, test, and prepare a pull request.
3-5 days
Activity statusHow available the issue appears right now: fresh, active, stale, blocked, or waiting on maintainer input.
Active
ClarityHow clearly the issue explains the expected change, acceptance criteria, and next step.
Clear
Prerequisites
JavaGit
Newbie friendlinessA 1-100 score estimating how approachable this issue is for first-time contributors.
50