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Date: Tue, 8 Aug 2017 17:33:00 +0000 (UTC)
From: "James Clampffer (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13086896.1499949668000.119330.1502213580472@Atlassian.JIRA>
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References: <JIRA.13086896.1499949668000@Atlassian.JIRA> <JIRA.13086896.1499949668288@jira-lw-us.apache.org>
Subject: [jira] [Updated] (HDFS-12134) libhdfs++: Add a synchronization
 interface for the GSSAPI
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archived-at: Tue, 08 Aug 2017 17:33:10 -0000


     [ https://issues.apache.org/jira/browse/HDFS-12134?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

James Clampffer updated HDFS-12134:
-----------------------------------
    Resolution: Fixed
        Status: Resolved  (was: Patch Available)

Thanks for taking a final look at this [~mdeepak], I committed the patch to HDFS-8707.

> libhdfs++: Add a synchronization interface for the GSSAPI
> ---------------------------------------------------------
>
>                 Key: HDFS-12134
>                 URL: https://issues.apache.org/jira/browse/HDFS-12134
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>          Components: hdfs-client
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-12134.HDFS-8707.000.patch, HDFS-12134.HDFS-8707.001.patch, HDFS-12134.HDFS-8707.002.patch, HDFS-12134.HDFS-8707.003.patch, HDFS-12134.HDFS-8707.004.patch
>
>
> Bits of the GSSAPI that Cyrus Sasl uses aren't thread safe.  There needs to be a way for a client application to share a lock with this library in order to prevent race conditions.  It can be done using event callbacks through the C API but we can provide something more robust (RAII) in the C++ API.
> Proposed client supplied lock, pretty much the C++17 lockable concept. Use a default if one isn't provided.  This would be scoped at the process level since it's unlikely that multiple instances of libgssapi unless someone puts some effort in with dlopen/dlsym.
> {code}
> class LockProvider
> {
>   virtual ~LockProvider() {}
>   // allow client application to deny access to the lock
>   virtual bool try_lock() = 0;
>   virtual void unlock() = 0;
> }
> {code}


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