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From "Samarth Jain (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (PHOENIX-1143) Prevent race condition between creating phoenix connection and closing phoenix driver/connection query services.
Date Wed, 06 Aug 2014 22:49:11 GMT

    [ https://issues.apache.org/jira/browse/PHOENIX-1143?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14088416#comment-14088416
] 

Samarth Jain commented on PHOENIX-1143:
---------------------------------------

NPE is one of the manifestations of the race conditions. There is other state that we end
up cleaning up in a ConnectionQueryServices.close() - sequences, statsManager, metadata, HConnection
etc. It would then be difficult to figure out why an exception like "sequence not present"
is happening or metadata NPE or why stats were not available etc. 

> Prevent race condition between creating phoenix connection and closing phoenix driver/connection
query services.
> ----------------------------------------------------------------------------------------------------------------
>
>                 Key: PHOENIX-1143
>                 URL: https://issues.apache.org/jira/browse/PHOENIX-1143
>             Project: Phoenix
>          Issue Type: Bug
>            Reporter: Samarth Jain
>            Assignee: Samarth Jain
>             Fix For: 5.0.0, 3.1, 4.1
>
>         Attachments: PHOENIX-1143-3.0.patch
>
>
> The race condition manifests when the following NPE is thrown: 
> {code}
> java.lang.NullPointerException
> Thrown-StackTrace: at org.apache.phoenix.jdbc.PhoenixConnection.<init>(PhoenixConnection.java:178)
> at org.apache.phoenix.query.ConnectionQueryServicesImpl.connect(ConnectionQueryServicesImpl.java:513)
> at org.apache.phoenix.jdbc.PhoenixEmbeddedDriver.connect(PhoenixEmbeddedDriver.java:116)
> {code}



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