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https://issues.apache.org/jira/browse/SOLR-12290?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Varun Thacker updated SOLR-12290:
---------------------------------
Attachment: SOLR-12290_7x.patch
> 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: master (8.0)
>
> Attachments: SOLR-12290.patch, SOLR-12290.patch, SOLR-12290.patch,
> SOLR-12290.patch, SOLR-12290_7x.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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