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From "Deepak Majeti (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HDFS-12134) libhdfs++: Add a synchronization interface for the GSSAPI
Date Tue, 08 Aug 2017 02:33:00 GMT

    [ https://issues.apache.org/jira/browse/HDFS-12134?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16117754#comment-16117754

Deepak Majeti commented on HDFS-12134:


> 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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