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Ran 07 Sep 2018 03:12PM UTC

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Committed 07 Sep 2018 03:12PM UTC coverage: 72.319% (-0.2%) from 72.492%

Job # 201.1

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push

jenkins

Committed by GitHub

Commit Message

BP-35: 128 bits support

Descriptions of the changes in this PR:

### Motivation

BookKeeper coordinates with a metadata store to generate a cluster wide `ledgerId`.
Currently this is a signed `64 bit` number (effectively 63 bits). This method works
great because we have a centralized metadata store for coordinating the id generation.
However this method may not scale as the cluster size and number of ledgers grow.

[Universally unique identifier - Wikipedia](https://en.wikipedia.org/wiki/Globally_unique_identifier)
is a preferred way to generate decentralized globally unique IDs and it takes `128 bits`.
This method can scale well as it doesn't need a centralized coordination.

This BP proposes the changes for increasing ledger id from `63 bits` to `128 bits`.

Master Issue: #603



Author: Sijie Guo <sijie@apache.org>

Reviewers: Andrey Yegorov <None>, Enrico Olivelli <eolivelli@gmail.com>, Jia Zhai <None>, Venkateswararao Jujjuri (JV) <None>

This closes #1611 from sijie/bp_35_128bits

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