Revision 5a2a6483dc23a8854e02984ece3b8d88b783959d authored by Yi Wu on 26 October 2017, 19:19:43 UTC, committed by Facebook Github Bot on 26 October 2017, 19:30:54 UTC
Summary: Adding the `min_blob_size` option to allow storing small values in base db (in LSM tree) together with the key. The goal is to improve performance for small values, while taking advantage of blob db's low write amplification for large values. Also adding expiration timestamp to blob index. It will be useful to evict stale blob indexes in base db by adding a compaction filter. I'll work on the compaction filter in future patches. See blob_index.h for the new blob index format. There are 4 cases when writing a new key: * small value w/o TTL: put in base db as normal value (i.e. ValueType::kTypeValue) * small value w/ TTL: put (type, expiration, value) to base db. * large value w/o TTL: write value to blob log and put (type, file, offset, size, compression) to base db. * large value w/TTL: write value to blob log and put (type, expiration, file, offset, size, compression) to base db. Closes https://github.com/facebook/rocksdb/pull/3066 Differential Revision: D6142115 Pulled By: yiwu-arbug fbshipit-source-id: 9526e76e19f0839310a3f5f2a43772a4ad182cd0
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_config.yml
# Site settings
permalink: /blog/:year/:month/:day/:title.html
title: RocksDB
tagline: A persistent key-value store for fast storage environments
description: >
RocksDB is an embeddable persistent key-value store for fast storage.
fbappid: "1615782811974223"
gacode: "UA-49459723-1"
# baseurl determines the subpath of your site. For example if you're using an
# organisation.github.io/reponame/ basic site URL, then baseurl would be set
# as "/reponame" but leave blank if you have a top-level domain URL as it is
# now set to "" by default as discussed in:
# http://jekyllrb.com/news/2016/10/06/jekyll-3-3-is-here/
baseurl: ""
# the base hostname & protocol for your site
# If baseurl is set, then the absolute url for your site would be url/baseurl
# This was also be set to the right thing automatically for local development
# https://github.com/blog/2277-what-s-new-in-github-pages-with-jekyll-3-3
# http://jekyllrb.com/news/2016/10/06/jekyll-3-3-is-here/
url: "http://rocksdb.org"
# Note: There are new filters in Jekyll 3.3 to help with absolute and relative urls
# absolute_url
# relative_url
# So you will see these used throughout the Jekyll code in this template.
# no more need for | prepend: site.url | prepend: site.baseurl
# http://jekyllrb.com/news/2016/10/06/jekyll-3-3-is-here/
#https://github.com/blog/2277-what-s-new-in-github-pages-with-jekyll-3-3
# The GitHub repo for your project
ghrepo: "facebook/rocksdb"
# Use these color settings to determine your colour scheme for the site.
color:
# primary should be a vivid color that reflects the project's brand
primary: "#2a2a2a"
# secondary should be a subtle light or dark color used on page backgrounds
secondary: "#f9f9f9"
# Use the following to specify whether the previous two colours are 'light'
# or 'dark' and therefore what colors can be overlaid on them
primary-overlay: "dark"
secondary-overlay: "light"
#Uncomment this if you want to enable Algolia doc search with your own values
#searchconfig:
# apikey: ""
# indexname: ""
# Blog posts are builtin to Jekyll by default, with the `_posts` directory.
# Here you can specify other types of documentation. The names here are `docs`
# and `top-level`. This means their content will be in `_docs` and `_top-level`.
# The permalink format is also given.
# http://ben.balter.com/2015/02/20/jekyll-collections/
collections:
docs:
output: true
permalink: /docs/:name/
top-level:
output: true
permalink: :name.html
# DO NOT ADJUST BELOW THIS LINE UNLESS YOU KNOW WHAT YOU ARE CHANGING
markdown: kramdown
kramdown:
input: GFM
syntax_highlighter: rouge
syntax_highlighter_opts:
css_class: 'rougeHighlight'
span:
line_numbers: false
block:
line_numbers: true
start_line: 1
sass:
style: :compressed
redcarpet:
extensions: [with_toc_data]
gems:
- jekyll-redirect-from
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