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From "Pavel Tupitsyn (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 08:52:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-6804?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16951734#comment-16951734

Pavel Tupitsyn commented on IGNITE-6804:


# I've fixed collection class references in the docs (generic specification is mandatory there),
pushed the branch (hope it's ok for you).
# "will lead to deadlock" is not technically correct, I would change it to "may lead to deadlock".
# Yes, we can do it in C# the same way as in Java. But I don't see how the warning is "throttled"
- looks like it will be displayed on every operation, am I missing something?


> 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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