[jira] [Assigned] (CASSANDRA-14877) StreamCoordinator "leaks" threads

["Aleksandr Sorokoumov (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/CASSANDRA-14877?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Aleksandr Sorokoumov reassigned CASSANDRA-14877:
------------------------------------------------

    Assignee: Massimiliano Tomassi

> StreamCoordinator "leaks" threads
> ---------------------------------
>
>                 Key: CASSANDRA-14877
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-14877
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Streaming and Messaging
>            Reporter: Massimiliano Tomassi
>            Assignee: Massimiliano Tomassi
>            Priority: Minor
>             Fix For: 2.1.21, 2.2.14, 3.0.18, 3.11.4, 4.0
>
>
> Since Cassandra 2.1, streaming sessions are started by running a StreamSessionConnector task for each session in a dedicated executor (a static field of StreamCoordinator).
> That executor is initialized with DebuggableThreadPoolExecutor.createWithFixedPoolSize, which means that once created (up to the given limit of the number of logical cores), its threads are kept alive for Integer.MAX_VALUE seconds.
> This practically means that once a node needs to establish streaming sessions to n other nodes, it will create Math.min(n, numLogicalCores) StreamConnectionEstablisher threads that will stay parked forever after initializing (not completing) the session.
> It seems preferable to replace DebuggableThreadPoolExecutor.createWithFixedPoolSize with DebuggableThreadPoolExecutor.createWithMaximumPoolSize which allows providing a saner keep-alive period (e.g. a minute).
> That's also what createWithFixedPoolSize's Javadoc recommends: If (most) threads are expected to be idle most of the time, prefer createWithMaxSize() instead.



--
This message was sent by Atlassian JIRA
(v7.6.3#76005)

---------------------------------------------------------------------
To unsubscribe, e-mail: commits-unsubscribe@cassandra.apache.org
For additional commands, e-mail: commits-help@cassandra.apache.org