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https://issues.apache.org/jira/browse/IGNITE-2643?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Vladimir Ozerov closed IGNITE-2643.
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> ODBC: Potential memory leak during client disconnect.
> -----------------------------------------------------
>
> Key: IGNITE-2643
> URL: https://issues.apache.org/jira/browse/IGNITE-2643
> Project: Ignite
> Issue Type: Sub-task
> Components: odbc
> Affects Versions: 1.5.0.final
> Reporter: Vladimir Ozerov
> Assignee: Vladimir Ozerov
> Priority: Critical
> Fix For: 1.6
>
>
> *Problem*
> When client executes a query, we preserve the cursor in concurrent
> collection. This could lead to two potential problems:
> 1) If problem disconnected abruptly, cursor gets stuck forever => memory leak.
> 2) Malicious client could flood us with requests which are never closed until
> node is out-of-memory.
> *Proposed solution*
> 1) When onDisconnect() callback is triggered, all pending client queries must
> be released. To achieve this it is better to move "OdbcNioListener.qryCurs"
> to session meta.
> 2) When new request is to be created, we must ensure that concurrent
> disconnect is not in progress. Otherwise, we might end up in a leak again. To
> achieve this, lets guard "add" logic with read-write lock.
> 3) Lets think about "max-concurrent-cursors-per-connection" property. It
> could be available from OdbcConfiguration. Once number of opened cursors is
> exceeded, we must throw an error to the client.
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