Github user serg38 commented on the pull request:
https://github.com/apache/cloudstack/pull/1466#issuecomment-216876560
Thanks @koushik-das. Looks like before 5.6 Mysql auto restricted length of
InnoDB indexes to 255 characters without giving trouble if index length is not
specified. For public_key index in ssh_keypairs table first 64 bytes is enough
to make good index. @nvazquez let's change this index creation to
ALTER TABLE `cloud`.`ssh_keypairs` ADD INDEX `i_public_key`
(`public_key`(64) ASC);
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