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From "Todd Lipcon (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HADOOP-9229) IPC: Retry on connection reset or socket timeout during SASL negotiation
Date Fri, 18 Jan 2013 16:10:16 GMT

    [ https://issues.apache.org/jira/browse/HADOOP-9229?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13557313#comment-13557313
] 

Todd Lipcon commented on HADOOP-9229:
-------------------------------------

Hey Kihwal. Have you been watching HDFS-4404? Looks like basically the same issue, if I'm
understanding you correctly. In particular, see this comment: https://issues.apache.org/jira/browse/HDFS-4404?focusedCommentId=13555680&page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel#comment-13555680
                
> IPC: Retry on connection reset or socket timeout during SASL negotiation
> ------------------------------------------------------------------------
>
>                 Key: HADOOP-9229
>                 URL: https://issues.apache.org/jira/browse/HADOOP-9229
>             Project: Hadoop Common
>          Issue Type: Improvement
>          Components: ipc
>    Affects Versions: 3.0.0, 2.0.3-alpha, 0.23.7
>            Reporter: Kihwal Lee
>
> When an RPC server is overloaded, incoming connections may not get accepted in time,
causing listen queue overflow. The impact on client varies depending on the type of OS in
use. On Linux, connections in this state look fully connected to the clients, but they are
without buffers, thus any data sent to the server will get dropped.
> This won't be a problem for protocols where client first wait for server's greeting.
Even for clients-speak-first protocols, it will be fine if the overload is transient and such
connections are accepted before the retransmission of dropped packets arrive. Otherwise, clients
can hit socket timeout after several retransmissions.  In certain situations, connection will
get reset while clients still waiting for ack.
> We have seen this happening to IPC clients during SASL negotiation. Since no call has
been sent, we should allow retry when connection reset or socket timeout happens in this stage.

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