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We apologize for the errors 502 tonight and last night you why below.

As you probably constantly wiped and poll. Some have probably managed to pull this relatively logical conclusion - especially considering the fact that last night after I wiped poll has recovered - the problems are caused by poll (at least I have come to believe besides a very big coincidence, it is the only option). Specifically, despite the fact that now we have a monster server simply have too many users.

For example, last night when it began to drop ~ 8720 votes were registered. When a user who has voted access index.php page of your query was executed fetch the responses, resulting in a SELECT-8720 lines.

Last night was ~ 19 s request / second index.php => ~ 165,680 rows read / second

The size of ~ 1.7MB table was => read it ~ 32.3MB / s only pollanswers table, if you know and read data from other tables, especially files_users (snatchlist), you realize that this may become a problem.
Obviously not transmitted user data in raw format, so it's not necessary traffic 32.3MB / s only for replies from the poll.

Tonight we tried to activate the cache module that is used to browse, namely cachelite, only that it causes another problem, because of the frequency with which votes are cache is overwritten too often.
First, this is not healthy Since there kill write cycles of SSD. Secondly, the CloudFlare induce in error because now it's content, there's more than 1ms.

At the moment we are working on optimizing the procedure.