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From "Ilya Lantukh (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (IGNITE-7964) Read a key from metastorage may hang on node restart
Date Fri, 16 Mar 2018 14:37:00 GMT

    [ https://issues.apache.org/jira/browse/IGNITE-7964?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16401978#comment-16401978
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Ilya Lantukh commented on IGNITE-7964:
--------------------------------------

[~sergey-chugunov],

Thanks for contribution! I've performed code review, all changes look good to me.

> Read a key from metastorage may hang on node restart
> ----------------------------------------------------
>
>                 Key: IGNITE-7964
>                 URL: https://issues.apache.org/jira/browse/IGNITE-7964
>             Project: Ignite
>          Issue Type: Bug
>          Components: persistence
>    Affects Versions: 2.4
>            Reporter: Sergey Chugunov
>            Assignee: Sergey Chugunov
>            Priority: Major
>             Fix For: 2.5
>
>
> MetaStorage handles *rmvId* counter incorrectly: it is not propagated to metapage and
is not persisted to disk; on restart *rmvId* is set to 0 which leads to incorrect initialization
of BPlusTree where all keys live.
> As a consequence if there are more than 52 keys and more than 31 of them get updated
than on next restart node hangs on attempt to read BaselineTopology info from metastore (because
of endless looping inside BPlusTree starting from the root over and over again).
> h2. Steps to reproduce
>  # Start single node with persistence enabled.
>  # Put 60 keys to metastore, update 40 of them.
>  # Restart node.
> h2. Expected behavior
> Node starts just fine.
> h2. Actual behavior
> Node hangs, thread dump of starting thread shows looping on reading BaselineTopology
from metastore.
> h2. Workaround
> No impact if no more than 52 keys are stored in metastore or keys are never updated.



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