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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-8453) Local exceptions in DistributedUpdateProcessor should not cut off an ongoing request.
Date Mon, 04 Jan 2016 17:34:40 GMT

    [ https://issues.apache.org/jira/browse/SOLR-8453?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15081423#comment-15081423
] 

Mark Miller commented on SOLR-8453:
-----------------------------------

bq. I thought we caught all exceptions in the SolrDispatchFilter and never let any bubble
up to Jetty.

The problem is not about whether the exception comes out of the SolrDispatchFilter - it's
a matter of managing the connection.

We want the client to handle the connection, so everything can be done cleanly. So the client
needs to be able to fully send the request and then fully receive the response - that is the
goal for all but really exceptional cases. If we let an exception bubble out and stop the
server thread (whether the dispatch filter swallows it or not), the request thread can still
be wrapping up - but if it tries to do any communication, it will get a connection reset as
the server has closed the connection. We are not properly letting the client finish its request
in these cases - so there is a race. We need to make sure the server does not close the connection
until the request is fully done.

> Local exceptions in DistributedUpdateProcessor should not cut off an ongoing request.
> -------------------------------------------------------------------------------------
>
>                 Key: SOLR-8453
>                 URL: https://issues.apache.org/jira/browse/SOLR-8453
>             Project: Solr
>          Issue Type: Bug
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>         Attachments: SOLR-8453.patch, SOLR-8453.patch, SOLR-8453.patch, SOLR-8453.patch,
SOLR-8453.patch, SOLR-8453.patch, SOLR-8453.patch
>
>
> The basic problem is that when we are streaming in updates via a client, an update can
fail in a way that further updates in the request will not be processed, but not in a way
that causes the client to stop and finish up the request before the server does something
else with that connection.
> This seems to mean that even after the server stops processing the request, the concurrent
update client is still in the process of sending the request. It seems previously, Jetty would
not go after the connection very quickly after the server processing thread was stopped via
exception, and the client (usually?) had time to clean up properly. But after the Jetty upgrade
from 9.2 to 9.3, Jetty closes the connection on the server sooner than previous versions (?),
and the client does not end up getting notified of the original exception at all and instead
hits a connection reset exception. The result was random fails due to connection reset throughout
our tests and one particular test failing consistently. Even before this update, it does not
seem like we are acting in a safe or 'behaved' manner, but our version of Jetty was relaxed
enough (or a bug was fixed?) for our tests to work out.



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