Process crawler technical requrements and make architecture decision

[vkuchyn]

https://docs.google.com/document/d/1RJG4Dg35DgT-6HLjLTmGrawzI3U2Kq6HBgESA2mtX_A/edit#
Process this document. Make sure - it is clear for you. You are welcome to ask questions in comments to google doc.
As result of this issue must be architecture decision posted to another google doc - so we can discuss it.

[vaa25]

@vkuchyn Doc.

[vkuchyn]

@vaa25 thanks, will review soon.

[vkuchyn]

@vaa25 see my comments and process them. Need minor improvement

[vaa25]

@vkuchyn answered to you there

[vkuchyn]

@vaa25 shall I review again? It is not clear with uniq key for event - only problem declaration

[vaa25]

@AndriyBaibak 4 hours

[vkuchyn]

@vaa25 nice job. thanks!