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lease's Introduction

Lease Build status License GoDoc

A generic leasing implementation of the Amazon-KCL.lease package. ideal for manage and partition work across a fleet of workers.

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What is a Lease ?

Lease type contains data pertianing to a lease.
Distributed systems may use leases to partition work across a fleet of workers.
Each unit of work (identified by a leaseKey) has a corresponding Lease.
Every worker will contend for all leases - only one worker will successfully take each one.
The worker should hold the lease until it is ready to stop processing the corresponding unit of work, or until it fails.
When the worker stops holding the lease, another worker will take and hold the lease.

To get started, see the examples

License

MIT

lease's People

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lease's Issues

Should not update uuid in old held leases

We've found issues when trying to update the lease with extra fields when it has been renewed by the renewer gorutine. Looking into it we've found that it is because the concurrencyToken is being updated (along with the whole Lease struct) every time it is renewed.
By comparing it with the base Java implementation I think the concurrencyToken should not change on Renew, only in Take.
In the commit history we've seen you already had fixed this on commit 5737f37 yet you changed your mind on commit e663b4a; I was wondering if you could elaborate on why this last commit was needed.

If you need more info or want to comment about it please don't hesitate to contact me.

Greetings

weighted lease

for example:

leaseKey leaseOwner leaseWeight leaseCounter
task 1 worker 1 1 (default) x
task 2 worker 2 3 x
task 3 worker 1 1 (default) x
task 4 worker 1 1 (default) x

comments:

  • the default weight of a lease(or task) is 1
  • we expect the leaser to partition the work according to the total weight of the tasks.

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