[jira] [Updated] (IGNITE-5399) Manual cache rebalancing feature is broken

["Andrew Mashenkov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/IGNITE-5399?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Mashenkov updated IGNITE-5399:
-------------------------------------
    Attachment: ManualRebalanceBug.java

> Manual cache rebalancing feature is broken
> ------------------------------------------
>
>                 Key: IGNITE-5399
>                 URL: https://issues.apache.org/jira/browse/IGNITE-5399
>             Project: Ignite
>          Issue Type: Bug
>          Components: cache
>    Affects Versions: 1.8, 1.9, 2.0
>            Reporter: Andrew Mashenkov
>             Fix For: 2.2
>
>         Attachments: ManualRebalanceBug.java
>
>
> Cache.rebalance() javadoc says "Future that will be completed when rebalancing is finished". But it is not true.
> 1. The method return value is Object, however actually it is Boolean and it is not obvious.
> 2. Future.get() return true if rebalance is finished, but can return false and reschedule rebalancing. So, control can return to thread before rebalancing even started.
> 3. Spinning on rebalance().get() until it true will not help. Seems like rebalance either restarted (1.9) or hanged (2.0). 
> PFA repro attached.



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