[jira] [Updated] (SOLR-8908) Registering each ZkIndexSchemaReader as an OnReconnect listener introduces a memory leak

["Timothy Potter (JIRA)" <ji...@apache.org>]

     [ https://issues.apache.org/jira/browse/SOLR-8908?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Timothy Potter updated SOLR-8908:
---------------------------------
    Fix Version/s: 5.5.1

> Registering each ZkIndexSchemaReader as an OnReconnect listener introduces a memory leak
> ----------------------------------------------------------------------------------------
>
>                 Key: SOLR-8908
>                 URL: https://issues.apache.org/jira/browse/SOLR-8908
>             Project: Solr
>          Issue Type: Bug
>          Components: Schema and Analysis
>    Affects Versions: 5.0, 5.1, 5.2, 5.2.1, 5.3, 5.3.1, 5.4, 5.5, 5.4.1
>            Reporter: Timothy Potter
>            Assignee: Timothy Potter
>              Labels: leak
>             Fix For: 5.5.1, 6.1
>
>
> As discovered by [~alexey], each ZkIndexSchemaReader registers as an OnReconnect listener with the ZkController to get notified when the ZK Session has been re-established. However, the ZkIndexSchemaReader is never removed from the reconnectListeners list in ZkController when the core is reloaded or removed. 
> Moreover, it also means that the same core is re-notified of the re-connect more than once if it has been reloaded.
> This leads to a memory leak, which can become a real issue if you have a lot of cores or do a lot of reloads of your cores.



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