<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>arohner</author><text>One thing I always find interesting about these kinds of problems is that most DBs don&amp;#x27;t describe how they&amp;#x27;re implemented. It&amp;#x27;s easy to use the wrong tool, and then once you learn how e.g. Mongo is implemented, it&amp;#x27;s obvious, &amp;quot;oh, that&amp;#x27;s why things are slow&amp;quot;.&lt;p&gt;I&amp;#x27;d love to see &lt;a href=&quot;http://eagain.net/articles/git-for-computer-scientists/&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;eagain.net&amp;#x2F;articles&amp;#x2F;git-for-computer-scientists&amp;#x2F;&lt;/a&gt;, but for every DB technology.</text><parent_chain></parent_chain></comment><story><title>Cassandra vs MongoDB For Time Series Data</title><url>http://relistan.com/cassandra-vs-mongo/</url></story>
<instructions>Your goal is to analyze the following comment and estimate how highly it will be upvoted by the Hacker News community.</instructions><comment><author>espeed</author><text>KariosDB (&lt;a href=&quot;https://github.com/proofpoint/kairosdb&quot; rel=&quot;nofollow&quot;&gt;https:&amp;#x2F;&amp;#x2F;github.com&amp;#x2F;proofpoint&amp;#x2F;kairosdb&lt;/a&gt;) is a time-series database for Casssandra. It&amp;#x27;s an OpenTSDB (&lt;a href=&quot;http://opentsdb.net&quot; rel=&quot;nofollow&quot;&gt;http:&amp;#x2F;&amp;#x2F;opentsdb.net&lt;/a&gt;) rewrite that supports sub-second precision.</text><parent_chain></parent_chain></comment><story><title>Cassandra vs MongoDB For Time Series Data</title><url>http://relistan.com/cassandra-vs-mongo/</url></story>