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From "Robert Stupp (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-14871) Severe concurrency issues in STCS,DTCS,TWCS,TMD.Topology,TypeParser
Date Wed, 07 Nov 2018 08:41:00 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-14871?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16677841#comment-16677841
] 

Robert Stupp commented on CASSANDRA-14871:
------------------------------------------

Patches:

|[3.0|https://github.com/snazy/cassandra/tree/14871-fix-concurrency-issues-3.0]|[3.11|https://github.com/snazy/cassandra/tree/14871-fix-concurrency-issues-3.11]|[trunk|https://github.com/snazy/cassandra/tree/14871-fix-concurrency-issues-trunk]

> Severe concurrency issues in STCS,DTCS,TWCS,TMD.Topology,TypeParser
> -------------------------------------------------------------------
>
>                 Key: CASSANDRA-14871
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14871
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Robert Stupp
>            Assignee: Robert Stupp
>            Priority: Critical
>             Fix For: 4.0, 3.0.x, 3.11.x
>
>
> There are a couple of places in the code base that do not respect that j.u.HashMap +
related classes are not thread safe and some parts rely on internals of the implementation
of HM, which can change.
> We have observed failures like {{NullPointerException}} and  {{ConcurrentModificationException}} as
well as wrong behavior.
> Affected areas in the code base:
>  * {{SizeTieredCompactionStrategy}}
>  * {{DateTieredCompactionStrategy}}
>  * {{TimeWindowCompactionStrategy}}
>  * {{TokenMetadata.Topology}}
>  * {{TypeParser}}
>  * streaming / concurrent access to {{LifecycleTransaction}} (handled in CASSANDRA-14554)
> While the patches for the compaction strategies + {{TypeParser}} are pretty straight
forward, the patch for {{TokenMetadata.Topology}} requires it to be made immutable.



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