<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>wheaties</author><text>As much as I love MongoDB it has way too many issues to use it as a primary data store for financial transactions. I hope they backed up and tested their backup recovery. Something tells me they&apos;re dealing with a data corruption/loss which wiped out their master and slaves without a backup. Perhaps if they&apos;ve got decent logging they can piece it together with logs.</text><parent_chain><item><author>tpsreport</author><text>&amp;#62; -My account balance went from 10 to 0 to 10&lt;p&gt;That could potentially indicate a database infrastructure problem. Eventually consistent databases can issue responses that appear to travel backwards in time. And [1] says this:&lt;p&gt;&lt;pre&gt;&lt;code&gt;  Coinbase uses MongoDB for their primary datastore for 
  their web app, api requests, etc. Coinbase is a
  decentralized, digital currency that is changing 
  the world of payments.
&lt;/code&gt;&lt;/pre&gt;
[1] &lt;a href=&quot;http://www.mongodb.org/about/production-deployments/&quot; rel=&quot;nofollow&quot;&gt;http://www.mongodb.org/about/production-deployments/&lt;/a&gt;</text></item><item><author>smallegan</author><text>Not sure if my story syncs up with what everyone else is seeing:
-I purchased 10 coins on the 14th.
-Money came out of my account on the 18th.
-They said they were available to me on the 20th via e-mail
-Have tried multiple times to send money to external wallets with no success
-My account balance went from 10 to 0 to 10
-Support has been horrible</text></item></parent_chain></comment><story><title>Ask HN: Does anyone know what&apos;s going on at Coinbase?</title><text>Maybe a Coinbase engineer can anonymously tell us what&apos;s going on over there, because nobody trying to trade with Coinbase can get a public answer.&lt;p&gt;Money is going missing.  Transactions have been delayed for days and, in some cases, over a week.  Even amounts already in BTC aren&apos;t leaving the system.&lt;p&gt;Coinbase claimed the other day this was all due to a database migration[1], but they&apos;re offline once again.&lt;p&gt;[1]: http://support.coinbase.com/customer/portal/articles/1051063-pending-transactions</text></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>stuffihavemade</author><text>It&apos;s absolutely insane if they are using Mongo as their source of truth (and not say some kind of caching layer). If there is one thing that should be ACID, it&apos;s financial transactions.</text><parent_chain><item><author>tpsreport</author><text>&amp;#62; -My account balance went from 10 to 0 to 10&lt;p&gt;That could potentially indicate a database infrastructure problem. Eventually consistent databases can issue responses that appear to travel backwards in time. And [1] says this:&lt;p&gt;&lt;pre&gt;&lt;code&gt;  Coinbase uses MongoDB for their primary datastore for 
  their web app, api requests, etc. Coinbase is a
  decentralized, digital currency that is changing 
  the world of payments.
&lt;/code&gt;&lt;/pre&gt;
[1] &lt;a href=&quot;http://www.mongodb.org/about/production-deployments/&quot; rel=&quot;nofollow&quot;&gt;http://www.mongodb.org/about/production-deployments/&lt;/a&gt;</text></item><item><author>smallegan</author><text>Not sure if my story syncs up with what everyone else is seeing:
-I purchased 10 coins on the 14th.
-Money came out of my account on the 18th.
-They said they were available to me on the 20th via e-mail
-Have tried multiple times to send money to external wallets with no success
-My account balance went from 10 to 0 to 10
-Support has been horrible</text></item></parent_chain></comment><story><title>Ask HN: Does anyone know what&apos;s going on at Coinbase?</title><text>Maybe a Coinbase engineer can anonymously tell us what&apos;s going on over there, because nobody trying to trade with Coinbase can get a public answer.&lt;p&gt;Money is going missing.  Transactions have been delayed for days and, in some cases, over a week.  Even amounts already in BTC aren&apos;t leaving the system.&lt;p&gt;Coinbase claimed the other day this was all due to a database migration[1], but they&apos;re offline once again.&lt;p&gt;[1]: http://support.coinbase.com/customer/portal/articles/1051063-pending-transactions</text></story>