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Posted to commits@cassandra.apache.org by "Jun Rao (JIRA)" <ji...@apache.org> on 2009/06/13 01:17:07 UTC
[jira] Reopened: (CASSANDRA-220) TCP writes get stuck
[ https://issues.apache.org/jira/browse/CASSANDRA-220?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Jun Rao reopened CASSANDRA-220:
-------------------------------
> TCP writes get stuck
> --------------------
>
> Key: CASSANDRA-220
> URL: https://issues.apache.org/jira/browse/CASSANDRA-220
> Project: Cassandra
> Issue Type: Bug
> Affects Versions: trunk
> Reporter: Jun Rao
> Assignee: Jun Rao
> Fix For: trunk
>
> Attachments: 220-2.patch, 220-3.patch, issue220.patchv1
>
>
> In our test cluster, I observed that on some nodes, TCP writes get accumulated in TcpConnection.pendingWrites. However, the selector never gets a ready to write event. As a result, all writes get stuck. This is because write(message) and doPendingWrites() are not fully synchronized. This following situation can happen:
> 1. write(message) adds stuff to pendingWrites.
> 2. a ready to write event happens; in doPendingWrites() buffered requests are written to socket
> 3. another write request happens, in write(message), the test for pendingWrites.isEmpty() is false
> 4. doPendingWrites() finishes writing all buffered request to socket
> 5. in write(message), the new request is added to pendingWrites
> Now, ready to write events will never happen again and all write requests get stuck in pendingWrites.
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