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From "Mark Miller (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-12290) Do not close any servlet streams and improve our servlet stream closing prevention code for users and devs.
Date Sun, 06 May 2018 19:51:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-12290?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16465277#comment-16465277
] 

Mark Miller commented on SOLR-12290:
------------------------------------

bq. Oh thanks, that was my patch 

Your welcome. If you insist on behaving like Robert, I'm leaving Solr like I left Lucene.
There is no reason for this garbage.

> Do not close any servlet streams and improve our servlet stream closing prevention code
for users and devs.
> -----------------------------------------------------------------------------------------------------------
>
>                 Key: SOLR-12290
>                 URL: https://issues.apache.org/jira/browse/SOLR-12290
>             Project: Solr
>          Issue Type: Bug
>      Security Level: Public(Default Security Level. Issues are Public) 
>            Reporter: Mark Miller
>            Assignee: Mark Miller
>            Priority: Major
>             Fix For: 7.4, master (8.0)
>
>         Attachments: SOLR-12290.patch, SOLR-12290.patch, SOLR-12290.patch, SOLR-12290.patch
>
>
> Original Summary:
> When you fetch a file for replication we close the request output stream after writing
the file which ruins the connection for reuse.
> We can't close response output streams, we need to reuse these connections. If we do
close them, clients are hit with connection problems when they try and reuse the connection
from their pool.
> New Summary:
> At some point the above was addressed during refactoring. We should remove these neutered
closes and review our close shield code.
> If you are here to track down why this is done:
> Connection reuse requires that we read all streams and do not close them - instead the
container itself must manage request and response streams. If we allow them to be closed,
not only do we lose some connection reuse, but we can cause spurious client errors that can
cause expensive recoveries for no reason. The spec allows us to count on the container to
manage streams. It's our job simply to not close them and to always read them fully, from
client and server. 
> Java itself can help with always reading the streams fully up to some small default amount
of unread stream slack, but that is very dangerous to count on, so we always manually eat
up anything on the streams our normal logic ends up not reading for whatever reason.
> We also cannot call abort without ruining the connection or sendError. These should be
options of very last resort (requiring a blood sacrifice) or when shutting down.
>  
>  



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