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From "James Clampffer (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-10409) libhdfs++: Something is holding connection_state_lock in RpcConnectionImpl destructor
Date Thu, 13 Oct 2016 21:26:20 GMT

     [ https://issues.apache.org/jira/browse/HDFS-10409?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

James Clampffer updated HDFS-10409:
-----------------------------------
    Attachment: HDFS-10409.HDFS-8707.001.patch

Forgot about this.. Uploading to get a new CI run.

> libhdfs++: Something is holding connection_state_lock in RpcConnectionImpl destructor
> -------------------------------------------------------------------------------------
>
>                 Key: HDFS-10409
>                 URL: https://issues.apache.org/jira/browse/HDFS-10409
>             Project: Hadoop HDFS
>          Issue Type: Sub-task
>            Reporter: James Clampffer
>            Assignee: James Clampffer
>         Attachments: HDFS-10409.HDFS-8707.000.patch, HDFS-10409.HDFS-8707.001.patch,
locked_dtor.patch
>
>
> The destructor to RpcConnectionImpl grabs a lock using a std::lock_guard<>.  
> It turns out something is already holding the lock when this happens.  Best bet is something
that looks like:
> {code}
> void SomeFunctionThatShouldntTakeLock(){
>   std::lock_guard<std::mutex> bad(connection_state_lock_)
>   conn_.reset(); //conn is a shared_ptr to RpcConnectionImpl
> }
> {code}



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