[jira] [Created] (CASSANDRA-14871) Severe concurrency issues in STCS,DTCS,TWCS,TMD.Topology,TypeParser

["Robert Stupp (JIRA)" <ji...@apache.org>]

Robert Stupp created CASSANDRA-14871:
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             Summary: 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
             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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