Revision d3d20dcdca9dc79d893a03dfa611fb1055c28f96 authored by Sagar Vemuri on 11 April 2019, 02:24:25 UTC, committed by Facebook Github Bot on 11 April 2019, 02:31:18 UTC
Summary: Introducing Periodic Compactions. This feature allows all the files in a CF to be periodically compacted. It could help in catching any corruptions that could creep into the DB proactively as every file is constantly getting re-compacted. And also, of course, it helps to cleanup data older than certain threshold. - Introduced a new option `periodic_compaction_time` to control how long a file can live without being compacted in a CF. - This works across all levels. - The files are put in the same level after going through the compaction. (Related files in the same level are picked up as `ExpandInputstoCleanCut` is used). - Compaction filters, if any, are invoked as usual. - A new table property, `file_creation_time`, is introduced to implement this feature. This property is set to the time at which the SST file was created (and that time is given by the underlying Env/OS). This feature can be enabled on its own, or in conjunction with `ttl`. It is possible to set a different time threshold for the bottom level when used in conjunction with ttl. Since `ttl` works only on 0 to last but one levels, you could set `ttl` to, say, 1 day, and `periodic_compaction_time` to, say, 7 days. Since `ttl < periodic_compaction_time` all files in last but one levels keep getting picked up based on ttl, and almost never based on periodic_compaction_time. The files in the bottom level get picked up for compaction based on `periodic_compaction_time`. Pull Request resolved: https://github.com/facebook/rocksdb/pull/5166 Differential Revision: D14884441 Pulled By: sagar0 fbshipit-source-id: 408426cbacb409c06386a98632dcf90bfa1bda47
1 parent ef0fc1b
feed.xml
---
layout: null
---
<?xml version="1.0" encoding="UTF-8"?>
<rss version="2.0" xmlns:atom="http://www.w3.org/2005/Atom">
<channel>
<title>{{ site.title | xml_escape }}</title>
<description>{{ site.description | xml_escape }}</description>
<link>https://rocksdb.org/feed.xml</link>
<atom:link href="{{ '/feed.xml' | absolute_url }}" rel="self" type="application/rss+xml"/>
<pubDate>{{ site.time | date_to_rfc822 }}</pubDate>
<lastBuildDate>{{ site.time | date_to_rfc822 }}</lastBuildDate>
<generator>Jekyll v{{ jekyll.version }}</generator>
{% for post in site.posts limit:10 %}
<item>
<title>{{ post.title | xml_escape }}</title>
<description>{{ post.content | xml_escape }}</description>
<pubDate>{{ post.date | date_to_rfc822 }}</pubDate>
<link>{{ post.url | absolute_url }}</link>
<guid isPermaLink="true">{{ post.url | absolute_url }}</guid>
{% for tag in post.tags %}
<category>{{ tag | xml_escape }}</category>
{% endfor %}
{% for cat in post.categories %}
<category>{{ cat | xml_escape }}</category>
{% endfor %}
</item>
{% endfor %}
</channel>
</rss>
Computing file changes ...