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From "stack (JIRA)" <j...@apache.org>
Subject [jira] Commented: (HBASE-1604) HBaseClient.getConnection() may return a broken connection without throwing an exception
Date Wed, 15 Jul 2009 16:16:14 GMT

    [ https://issues.apache.org/jira/browse/HBASE-1604?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12731539#action_12731539

stack commented on HBASE-1604:

Your patch seems to be reversed.  Is that possible Eugene?  You want to throw the exception,
is that right?

Have you run into this issue or is this from reading code?

This code is actually from Hadoop.  Its the Hadoop RPC code with small amendments to suit
hbase case.

> HBaseClient.getConnection() may return a broken connection without throwing an exception
> ----------------------------------------------------------------------------------------
>                 Key: HBASE-1604
>                 URL: https://issues.apache.org/jira/browse/HBASE-1604
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: client
>    Affects Versions: 0.19.2
>            Reporter: Eugene Kirpichov
>         Attachments: hbase-1604.patch
> Consider the code of HBaseClient.getConnection():
> {code}
>     connection.setupIOstreams();
>     return connection;
>   }
> {code}
> Now consider the setupIOstreams() method:
> {code}
>       } catch (IOException e) {
>         markClosed(e);
>         close(); // Removes the connection from pool
>       }
> {code}
> So, if something goes wrong inside of setupIOstreams, then after its invocation the connection
will be broken (will have its .in and .out streams nulls, for example) and will not be in
pool, but will still be returned from the getConnection method and cause further harm (for
example, cause a NullPointerException in further calls such as sendCall, which use the in
and out streams).
> Suggested fix: make the setupIOstreams method rethrow the IOException inside that catch
> Reproduction: Restart the hbase master and/or regionserver while a client program is
running, and put a breakpoint into that catch block.
> I actually observed a situation where the broken connection stayed in the pool, but I
don't yet know how to reproduce it or what is the reason. I am investigating the issue, but
for now at least the aforementioned bug should be fixed.

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