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From Shravya Nethula <shravya.neth...@aline-consulting.com>
Subject Re: Support for Unique columns in Ignite
Date Thu, 21 Nov 2019 11:59:27 GMT
Hi Anton,

Thank you for the information.


Regards,

Shravya Nethula,

BigData Developer,

[cid:6447e351-fbb4-44f3-94f2-94b638753545]

Hyderabad.

________________________________
From: akurbanov <antkr.dev@gmail.com>
Sent: Thursday, November 21, 2019 5:23 PM
To: user@ignite.apache.org <user@ignite.apache.org>
Subject: Re: Support for Unique columns in Ignite

Hello,

Unique constraints are not yet implemented in Ignite and I would assume they
won't be generally available soon enough.

The reasoning behind that is in general each put/insert is a distributed
insert/put. There are some circumstances under which this operation might
happen to be local: if cache is replicated or the constrained field is an
affinity key for a cache. Otherwise it is a cluster-wide constraint check
operation for each put/insert and might dramatically affect the overall
performance depending on cache size and cluster size which means that the
scalability is affected too.

Unique field might just be a part of primary key.

Best regards,
Anton



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