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From "Jonathan Ellis (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (CASSANDRA-2755) ColumnFamilyRecordWriter fails to throw a write exception encountered after the user begins to close the writer
Date Mon, 13 Jun 2011 15:13:51 GMT

     [ https://issues.apache.org/jira/browse/CASSANDRA-2755?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jonathan Ellis updated CASSANDRA-2755:
--------------------------------------

    Attachment: 2755-v2.txt

It looks to me that as long as we check for the exception before calling join, there will
be a window to miss one.

v2 encapsulates RangeClient.close better to avoid this.

> ColumnFamilyRecordWriter fails to throw a write exception encountered after the user
begins to close the writer
> ---------------------------------------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-2755
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-2755
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Hadoop
>    Affects Versions: 0.8.0
>            Reporter: Greg Katz
>            Assignee: Mck SembWever
>         Attachments: 2755-v2.txt, CASSANDRA-2755.patch
>
>
> There appears to be a race condition in {{ColumnFamilyRecordWriter}} that can result
in the loss of an exception. Here is how it can happen (W stands for the {{RangeClient}}'s
worker thread; U stands for the {{ColumnFamilyRecordWriter}} user's thread):
> # W: {{RangeClient}}'s {{run}} method catches an exception originating in the Thrift
client/socket, but doesn't get a chance to set it on the {{lastException}} field before it
the thread is preempted.
> # U: The user calls {{close}} which calls {{stopNicely}}. Because the {{lastException}}
field is null, {{stopNicely}} does not throw anything. {{close}} then joins on the worker
thread.
> # W: The {{RangeClient}}'s {{run}} method sets the {{lastException}} field and exits.
> # U: Although the thread in {{close}} is waiting for the worker thread to exit, it has
already checked the {{lastException}} field so it doesn't detect the presence of the last
exception. Instead, {{close}} returns without throwing anything.
> This race condition means that intermittently write failures will go undetected.

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