IGNITE-19119 Prepare org.apache.ignite.internal.storage.index.IndexStorage to built index

[tkalkirill]

https://issues.apache.org/jira/browse/IGNITE-19119

[sashapolo]

All other methods in this class declare throws StorageException explicitly

[tkalkirill]

But this exception is not checked, there is no need to specify it, documentation is enough.
I can remove it in other methods, but I think we should not change it.

[sashapolo]

But this exception is not checked, there is no need to specify it, documentation is enough.

I agree with you, but consistency is more important. So we either add them everywhere or remove them. I think @ibessonov may be against removing them, because he added these throws in the first place.

[ibessonov]

From my side - exception in the signature simply makes it more explicit.
StorageException should have been checked, and we wouldn't have this discussion in such case.

[tkalkirill]

We discussed it personally, decided to remake StorageException into a checked in the future and therefore add it to the signature.

[sashapolo]

Please don't do that, checked exceptions suck and should not be used