A high performance replicated log service. (The development is moved to Apache Incubator)

Last update: Dec 29, 2022

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Overview

Apache DistributedLog (incubating)

Apache DistributedLog (DL) is a high-throughput, low-latency replicated log service, offering durability, replication and strong consistency as essentials for building reliable real-time applications.

Status

Apache DistributedLog project graduated from Incubator at July 2017. It is now a sub-project of Apache BookKeeper.

The core components of Apache DistributedLog has been merged as part of Apache BookKeeper. The development of Apache DistributedLog has been moved under BookKeeper. See BP-26: Move distributedlog library as part of bookkeeper for more details.

Features

High Performance

DL is able to provide milliseconds latency on durable writes with a large number of concurrent logs, and handle high volume reads and writes per second from thousands of clients.

Durable and Consistent

Messages are persisted on disk and replicated to store multiple copies to prevent data loss. They are guaranteed to be consistent among writers and readers in terms of strict ordering.

Efficient Fan-in and Fan-out

DL provides an efficient service layer that is optimized for running in a multi- tenant datacenter environment such as Mesos or Yarn. The service layer is able to support large scale writes (fan-in) and reads (fan-out).

Various Workloads

DL supports various workloads from latency-sensitive online transaction processing (OLTP) applications (e.g. WAL for distributed database and in-memory replicated state machines), real-time stream ingestion and computing, to analytical processing.

Multi Tenant

To support a large number of logs for multi-tenants, DL is designed for I/O isolation in real-world workloads.

Layered Architecture

DL has a modern layered architecture design, which separates the stateless service tier from the stateful storage tier. To support large scale writes (fan- in) and reads (fan-out), DL allows scaling storage independent of scaling CPU and memory.

First Steps

Concepts: Start with the basic concepts of DistributedLog. This will help you to fully understand the other parts of the documentation, including setup, integration and operation guide. It is highly recommended to read this first.
Quickstarts: Run DistributedLog on your local machine or follow the tutorial to write a simple program to interact with DistributedLog.
Setup: The docker and cluster setup guides show how to deploy DistributedLog stack.
User Guide: You can checkout our guides about the basic concepts and the Core Library API or Proxy Client API to learn how to use DistributedLog to build your reliable real-time services.

Next Steps

Design Documents: Learn about the architecture, design considerations and implementation details of DistributedLog.
Tutorials: You can check out the tutorials on how to build real applications.
Admin Guide: You can check out our guides about how to operate the DistributedLog Stack.

Get In Touch

Report a Bug

For filing bugs, suggesting improvements, or requesting new features, help us out by opening a jira.

Need Help?

Subscribe or mail the [email protected] list - Ask questions, find answers, join developement discussions and also help other users.

Contributing

We feel that a welcoming open community is important and welcome contributions.

Contributing Code

See Developer Guide to get your local environment setup.
Take a look at our open issues.
Review our coding style and follow our code reviews to learn about our conventions.
Make your changes according to our code review workflow.
Checkout the list of project ideas to contribute more features or improvements.

Improving Website and Documentation

See website/README.md on how to build the website.
See docs/README.md on how to build the documentation.

About

Apache DistributedLog is an open source project of The Apache Software Foundation (ASF). The Apache DistributedLog project originated from Twitter.

Comments

Add documents on running distributedlog in distributed mode
add documentation on running distributedlog in distributed mode

improve scripts to start daemons for zookeeper, bookkeeper and write proxy

misc changes on stats provider and write proxy announcement.
opened by sijie 3
Bump jekyll from 3.2.1 to 3.6.3 in /docs
Bumps jekyll from 3.2.1 to 3.6.3.

Release notes

Sourced from jekyll's releases.

v3.6.2

Development Fixes

Update Rubocop to 0.51.0 (#6444)

Add test for layout as string (#6445)

Bug Fixes

Problematic UTF+bom files (#6322)

Always treat data.layout as a string (#6442)

v3.6.1

Documentation

Doc y_day in docs/permalinks (#6244)

Update frontmatter.md (#6371)

Elaborate on excluding items from processing (#6136)

Style lists in tables (#6379)

Remove duplicate "available" (#6380)

Development Fixes

Bump rubocop to use v0.50.x (#6368)

v3.6.0

Minor Enhancements

Ignore final newline in folded YAML string (#6054)

Add URL checks to Doctor (#5760)

Fix serving files that clash with directories (#6222) (#6231)

Bump supported Ruby version to >= 2.1.0 (#6220)

set LiquidError#template_name for errors in included file (#6206)

Access custom config array throughout session (#6200)

Add support for Rouge 2, in addition to Rouge 1 (#5919)

Allow yield to logger methods & bail early on no-op messages (#6315)

Update mime-types. (#6336)

Use a Schwartzian transform with custom sorting (#6342)

Alias Drop#invoke_drop to Drop#[] (#6338)

Bug Fixes

Deprecator: fix typo for --serve command (#6229)

Reader#read_directories: guard against an entry not being a directory (#6226)

kramdown: symbolize keys in-place (#6247)

Call to_s on site.url before attempting to concatenate strings (#6253)

Enforce Style/FrozenStringLiteralComment (#6265)

Update theme-template README to note 'assets' directory (#6257)

Memoize the return value of Document#url (#6266)

delegate StaticFile#to_json to StaticFile#to_liquid (#6273)

Fix Drop#key? so it can handle a nil argument (#6281)

... (truncated)

Changelog

Sourced from jekyll's changelog.

3.6.3 / 2018-09-18

Bug Fixes

3.6.x: security: fix include bypass of EntryFilter#filter symlink check (#7229)

3.6.2 / 2017-10-21

Development Fixes

Update Rubocop to 0.51.0 (#6444)

Add test for layout as string (#6445)

Bug Fixes

Problematic UTF+bom files (#6322)

Always treat data.layout as a string (#6442)

3.6.1 / 2017-10-20

Documentation

Doc y_day in docs/permalinks (#6244)

Update frontmatter.md (#6371)

Elaborate on excluding items from processing (#6136)

Style lists in tables (#6379)

Remove duplicate "available" (#6380)

Development Fixes

Bump rubocop to use v0.50.x (#6368)

3.6.0 / 2017-09-21

Minor Enhancements

Ignore final newline in folded YAML string (#6054)

Add URL checks to Doctor (#5760)

Fix serving files that clash with directories (#6222) (#6231)

Bump supported Ruby version to >= 2.1.0 (#6220)

set LiquidError#template_name for errors in included file (#6206)

Access custom config array throughout session (#6200)

Add support for Rouge 2, in addition to Rouge 1 (#5919)

Allow yield to logger methods & bail early on no-op messages (#6315)

Update mime-types. (#6336)

Use a Schwartzian transform with custom sorting (#6342)

Alias Drop#invoke_drop to Drop#[] (#6338)

Bug Fixes
... (truncated)

Commits

9012230 Release :gem: 3.6.3

3ffee1d Release :gem: 3.6.3

caddaeb 3.6.x: security: fix include bypass of EntryFilter#filter symlink check (...

0b83d76 Update site History

0d555a7 Release 💎 3.6.2

1cda184 Update history to reflect merge of #6451 #6452 #6453 [ci skip]

5a0582a Backport add-test-for-layout-as-string from #6445 to 3.6-stable

035c6e0 Backport patch-1 from #6442 to 3.6-stable

1377cf2 Backport utf8-bom from #6322 to 3.6-stable (#6451)

de4007c Update history to reflect merge of #6450 [ci skip]

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dependencies
opened by dependabot[bot] 2
Bump ffi from 1.9.14 to 1.12.2 in /docs
Bumps ffi from 1.9.14 to 1.12.2.

Changelog

Sourced from ffi's changelog.

1.12.2 / 2020-02-01

Fix possible segfault at FFI::Struct#[] and []= after GC.compact . #742

1.12.1 / 2020-01-14

Added:

Add binary gem support for ruby-2.7 on Windows

1.12.0 / 2020-01-14

Added:

FFI::VERSION is defined as part of require 'ffi' now. It is no longer necessary to require 'ffi/version' .

Changed:

Update libffi to latest master.

Deprecated:

Overwriting struct layouts is now warned and will be disallowed in ffi-2.0. #734, #735

1.11.3 / 2019-11-25

Removed:

Remove support for tainted objects which cause deprecation warnings in ruby-2.7. #730

1.11.2 / 2019-11-11

Added:

Add DragonFlyBSD as a platform. #724

Changed:

Sort all types.conf files, so that files and changes are easier to compare.

Regenerated type conf for freebsd12 and x86_64-linux targets. #722

Remove MACOSX_DEPLOYMENT_TARGET that was targeting very old version 10.4. #647

Fix library name mangling for non glibc Linux/UNIX. #727

Fix compiler warnings raised by ruby-2.7

Update libffi to latest master.

1.11.1 / 2019-05-20
... (truncated)

Commits

ad524cb Bump VERSION to 1.12.2

01cbd06 Update CHANGELOG for 1.12.2

6662bcc Replace st_table with simple cache and fix segfault after GC.compact

6845314 Remove old references to ruby-1.9

b54e735 Bump VERSION to 1.12.1

ee13af1 Do parallel builds in CI docker containers

2c81c6b Respect MAKE environment variable for libtest build

b2793a3 Better document enable/disable libffi switches in the README

8169aef Bump VERSION to 1.12.0

62c0c97 Update CHANGELOG for version 1.12.0

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dependencies
opened by dependabot[bot] 2
Bump nokogiri from 1.6.8 to 1.10.8 in /docs
Bumps nokogiri from 1.6.8 to 1.10.8.

Release notes

Sourced from nokogiri's releases.

1.10.8 / 2020-02-10

Security

[MRI] Pulled in upstream patch from libxml that addresses CVE-2020-7595. Full details are available in #1992. Note that this patch is not yet (as of 2020-02-10) in an upstream release of libxml.

1.10.7 / 2019-12-03

Bug

[MRI] Ensure the patch applied in v1.10.6 works with GNU patch. #1954

1.10.6 / 2019-12-03

Bug

[MRI] Fix FreeBSD installation of vendored libxml2. [#1941, #1953] (Thanks, @nurse!)

1.10.5 / 2019-10-31

Dependencies

[MRI] vendored libxml2 is updated from 2.9.9 to 2.9.10

[MRI] vendored libxslt is updated from 1.1.33 to 1.1.34

1.10.4 / 2019-08-11

Security

Address CVE-2019-5477 (#1915)

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess by Ruby's Kernel.open method. Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user input.

This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

This CVE's public notice is sparklemotion/nokogiri#1915

1.10.3 / 2019-04-22

Security Notes
... (truncated)

Changelog

Sourced from nokogiri's changelog.

1.10.8 / 2020-02-10

Security

[MRI] Pulled in upstream patch from libxml that addresses CVE-2020-7595. Full details are available in #1992. Note that this patch is not yet (as of 2020-02-10) in an upstream release of libxml.

1.10.7 / 2019-12-03

Fixed

[MRI] Ensure the patch applied in v1.10.6 works with GNU patch. [#1954]

1.10.6 / 2019-12-03

Fixed

[MRI] Fix FreeBSD installation of vendored libxml2. [#1941, #1953] (Thanks, @nurse!)

1.10.5 / 2019-10-31

Security

[MRI] Vendored libxslt upgraded to v1.1.34 which addresses three CVEs for libxslt:

CVE-2019-13117

CVE-2019-13118

CVE-2019-18197

CVE-2019-19956

More details are available at #1943.

Dependencies

[MRI] vendored libxml2 is updated from 2.9.9 to 2.9.10

[MRI] vendored libxslt is updated from 1.1.33 to 1.1.34

1.10.4 / 2019-08-11

Security

Address CVE-2019-5477 (#1915).

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess by Ruby's Kernel.open method. Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user input.

This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.
... (truncated)

Commits

6ce10d1 version bump to v1.10.8

2320f5b update CHANGELOG for v1.10.8

4a77fdb remove patches from the hoe Manifest

570b6cb update to use rake-compiler ~1.1.0

2cdb68e backport libxml2 patch for CVE-2020-7595

e6b3229 version bump to v1.10.7

4f9d443 update CHANGELOG

80e67ef Fix the patch from #1953 to work with both git and patch

7cf1b85 Fix typo in generated metadata

d76180d add gem metadata

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dependencies
opened by dependabot[bot] 2
Bump nokogiri from 1.6.8 to 1.10.5 in /docs
Bumps nokogiri from 1.6.8 to 1.10.5.

Release notes

Sourced from nokogiri's releases.

1.10.5 / 2019-10-31

Dependencies

[MRI] vendored libxml2 is updated from 2.9.9 to 2.9.10

[MRI] vendored libxslt is updated from 1.1.33 to 1.1.34

1.10.4 / 2019-08-11

Security

Address CVE-2019-5477 (#1915)

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess by Ruby's Kernel.open method. Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user input.

This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

This CVE's public notice is sparklemotion/nokogiri#1915

1.10.3 / 2019-04-22

Security Notes

[MRI] Pulled in upstream patch from libxslt that addresses CVE-2019-11068. Full details are available in #1892. Note that this patch is not yet (as of 2019-04-22) in an upstream release of libxslt.

1.10.2 / 2019-03-24

Security

[MRI] Remove support from vendored libxml2 for future script macros. #1871

[MRI] Remove support from vendored libxml2 for server-side includes within attributes. #1877

Bug fixes

[JRuby] Fix node ownership in duplicated documents. #1060

[JRuby] Rethrow exceptions caught by Java SAX handler. [#1847, #1872] (Thanks, @adjam!)

1.10.1 / 2019-01-13

Features

[MRI] During installation, handle Xcode 10's new library pathOS. [#1801, #1851] (Thanks, @mlj and @deepj!)

Avoid unnecessary creation of Procs in many methods. #1776 (Thanks, @chopraanmol1!)

... (truncated)

Changelog

Sourced from nokogiri's changelog.

1.10.5 / 2019-10-31

Dependencies

[MRI] vendored libxml2 is updated from 2.9.9 to 2.9.10

[MRI] vendored libxslt is updated from 1.1.33 to 1.1.34

1.10.4 / 2019-08-11

Security

Address CVE-2019-5477 (#1915)

A command injection vulnerability in Nokogiri v1.10.3 and earlier allows commands to be executed in a subprocess by Ruby's Kernel.open method. Processes are vulnerable only if the undocumented method Nokogiri::CSS::Tokenizer#load_file is being passed untrusted user input.

This vulnerability appears in code generated by the Rexical gem versions v1.0.6 and earlier. Rexical is used by Nokogiri to generate lexical scanner code for parsing CSS queries. The underlying vulnerability was addressed in Rexical v1.0.7 and Nokogiri upgraded to this version of Rexical in Nokogiri v1.10.4.

This CVE's public notice is sparklemotion/nokogiri#1915

1.10.3 / 2019-04-22

Security Notes

[MRI] Pulled in upstream patch from libxslt that addresses CVE-2019-11068. Full details are available in #1892. Note that this patch is not yet (as of 2019-04-22) in an upstream release of libxslt.

1.10.2 / 2019-03-24

Security

[MRI] Remove support from vendored libxml2 for future script macros. #1871

[MRI] Remove support from vendored libxml2 for server-side includes within attributes. #1877

Bug fixes

[JRuby] Fix node ownership in duplicated documents. #1060

[JRuby] Rethrow exceptions caught by Java SAX handler. [#1847, #1872] (Thanks, @adjam!)

1.10.1 / 2019-01-13

Features

[MRI] During installation, handle Xcode 10's new library path. [#1801, #1851] (Thanks, @mlj and @deepj!)

Avoid unnecessary creation of Procs in many methods. #1776 (Thanks, @chopraanmol1!)

... (truncated)

Commits

1bc2ff9 version bump to v1.10.5

383c1f8 update CHANGELOG

43a1753 dependency: update libxslt to 1.1.34 final

99d8a6b dependency: update libxml to 2.9.10 final

2a86496 add suppressions for ruby 2.7

dca794a update CHANGELOG with correct release date for v1.10.4

077e010 update rake-compiler commands to install bundler

beb832e version bump to v1.10.4

5d30128 Merge branch '1915-css-tokenizer-load-file-vulnerability_v1.10.x' into v1.10.x

c86b5fc update CHANGELOG

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dependencies
opened by dependabot[bot] 2
small corrections to docs/introduction

Small things I'd change in the docs.

In addition, the following chapter on Fan-in, Fan-out looks awfully wrong. It uses bold heavily, has mistakes and is not very readable. As I'm new to DistributedLog I'd leave fixing it to you.

The core of DistributedLog supports single-writer, multiple-readers semantics. The service layer built on top of the DistributedLog Core to support large scale of number of writers and readers. The service layer includes Write Proxy and Read Proxy. Write Proxy manages the writers of logs and fail over them when machines are failed. It allows supporting which don't care about the log ownership by aggregating writes from many sources (aka Fan-in). Read Proxy optimize reader path by caching log records in cases where hundreds or thousands of readers are consuming a same log stream.

opened by akauppi 2
Update project status in README

Update the project status in the README to match the status found in https://github.com/apache/distributedlog. This should help direct people to where the code now lives if they end up at this repo through old links and such.

opened by dan-sf 1

Releases(0.3.51-RC1)

Owner

Twitter

Twitter 💙 #opensource

GitHub http://distributedlog.incubator.apache.org/

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71 Dec 21, 2022

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ScaleCube Services is a high throughput, low latency reactive microservices library built to scale. it features: API-Gateways, service-discovery, service-load-balancing, the architecture supports plug-and-play service communication modules and features. built to provide performance and low-latency real-time stream-processing. its open and designed to accommodate changes. (no sidecar in a form of broker or any kind)

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61 Nov 22, 2022

A high performance replicated log service. (The development is moved to Apache Incubator)

Related tags

Overview

Apache DistributedLog (incubating)

Status

Features

High Performance

Durable and Consistent

Efficient Fan-in and Fan-out

Various Workloads

Multi Tenant

Layered Architecture

First Steps

Next Steps

Get In Touch

Report a Bug

Need Help?

Contributing

Contributing Code

Improving Website and Documentation

About

Comments

Add documents on running distributedlog in distributed mode

Bump jekyll from 3.2.1 to 3.6.3 in /docs

v3.6.2

Development Fixes

Bug Fixes

v3.6.1

Documentation

Development Fixes

v3.6.0

Minor Enhancements

Bug Fixes

3.6.3 / 2018-09-18

Bug Fixes

3.6.2 / 2017-10-21

Development Fixes

Bug Fixes

3.6.1 / 2017-10-20

Documentation

Development Fixes

3.6.0 / 2017-09-21

Minor Enhancements

Bug Fixes

Bump ffi from 1.9.14 to 1.12.2 in /docs

1.12.2 / 2020-02-01

1.12.1 / 2020-01-14

1.12.0 / 2020-01-14

1.11.3 / 2019-11-25

1.11.2 / 2019-11-11

Bump nokogiri from 1.6.8 to 1.10.8 in /docs

1.10.8 / 2020-02-10

Security

1.10.7 / 2019-12-03

Bug

1.10.6 / 2019-12-03

Bug

1.10.5 / 2019-10-31

Dependencies

1.10.4 / 2019-08-11

Security

Address CVE-2019-5477 (#1915)

1.10.3 / 2019-04-22

Security Notes

1.10.8 / 2020-02-10

Security

1.10.7 / 2019-12-03

Fixed

1.10.6 / 2019-12-03

Fixed

1.10.5 / 2019-10-31

Security

Dependencies

1.10.4 / 2019-08-11

Security

Bump nokogiri from 1.6.8 to 1.10.5 in /docs

1.10.5 / 2019-10-31

Dependencies

1.10.4 / 2019-08-11

Security