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https://issues.apache.org/jira/browse/IGNITE-967?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Yakov Zhdanov updated IGNITE-967:
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Priority: Critical (was: Major)
> Internal thread locals are not always cleaned
> ---------------------------------------------
>
> Key: IGNITE-967
> URL: https://issues.apache.org/jira/browse/IGNITE-967
> Project: Ignite
> Issue Type: Bug
> Components: general
> Affects Versions: sprint-4
> Reporter: Valentin Kulichenko
> Priority: Critical
>
> One of our users reported that he sees warnings in Tomcat's log when the
> application that's running Ignite in embedded mode is undeployed:
> {code}
> SEVERE: The web application [/XXX] created a ThreadLocal with key of type
> [org.apache.ignite.internal.util.GridSpinReadWriteLock$1] (value
> [org.apache.ignite.internal.util.GridSpinReadWriteLock$1@2c2858af]) and a
> value of type [java.lang.Integer] (value [0]) but failed to remove it when
> the web application was stopped. Threads are going to be renewed over time to
> try and avoid a probable memory leak.
> {code}
> There is also the similar warning for {{GridToStringBuilder.threadCache}}.
> While it's usually OK not to clean thread locals on standalone node, in app
> server it can cause a memory leak.
> To avoid such issues I suggest to add a special step after all test suites
> that will check thread locals in test runner thread. If we have this check in
> CI, we will fix it once and for always.
> Thread local values can be introspected through {{Thread.threadLocals}}
> variable. It would also be a good idea to check Tomcat's sources on how it's
> done there.
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