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From "Ilya Kasnacheev (Jira)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-6804) Print a warning if HashMap is passed into bulk update operations
Date Tue, 15 Oct 2019 14:30:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16951967#comment-16951967
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Ilya Kasnacheev commented on IGNITE-6804:
-----------------------------------------

[~ptupitsyn] There's practically no way to not cause deadlock with HashMap so it makes sense
to write "will".

It's like with gets() function whose documentation starts with "+Never use this function.+"

> Print a warning if HashMap is passed into bulk update operations
> ----------------------------------------------------------------
>
>                 Key: IGNITE-6804
>                 URL: https://issues.apache.org/jira/browse/IGNITE-6804
>             Project: Ignite
>          Issue Type: Improvement
>          Components: cache
>            Reporter: Denis A. Magda
>            Assignee: Ilya Kasnacheev
>            Priority: Critical
>              Labels: usability
>          Time Spent: 10m
>  Remaining Estimate: 0h
>
> Ignite newcomers tend to stumble on deadlocks simply because the keys are passed in an
unordered HashMap. Propose to do the following:
> * update bulk operations Java docs.
> * print out a warning if not SortedMap (e.g. HashMap, Weak/Identity/Concurrent/Linked
HashMap etc) is passed into
> a bulk method (instead of SortedMap) and contains more than 1 element. However, we should
make sure that we only print that warning once and not every time the API is called.
> * do not produce warning for explicit optimistic transactions
> More details are here:
> http://apache-ignite-developers.2346864.n4.nabble.com/Re-Ignite-2-0-0-GridUnsafe-unmonitor-td23706.html



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