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From "Hrishikesh Gadre (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (SOLR-7344) Allow Jetty thread pool limits while still avoiding distributed deadlock.
Date Sun, 14 Jun 2015 19:57:00 GMT

    [ https://issues.apache.org/jira/browse/SOLR-7344?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14585227#comment-14585227
] 

Hrishikesh Gadre commented on SOLR-7344:
----------------------------------------

>>Ouch... I hope that's not true. That would certainly be very invasive to clients.
Hopefully there's blocking behavior in there too, and requests are only rejected after too
many of them are buffered?

The current implementation is as follows,

- Whenever a request can not processed immediately, it is suspended and placed on an internal
queue.
- We associate a (configurable) timeout value with this request and attach a callback (using
Servlet 3 AsyncListener).
- Whenever the timeout occurs, we attempt to reschedule request. If a thread is available
for the corresponding request type, then the request goes through. Otherwise we send the HTTP
503 error.

So from client perspective it is still blocking (until a timeout happens on the server). At
this point either it will get a valid response or an HTTP 503 error. Please take a look [here|https://github.com/hgadre/servletrequest-scheduler/blob/master/src/main/java/org/apache/solr/scheduling/RequestSchedulerFilter.java#L138]
for more details.

> Allow Jetty thread pool limits while still avoiding distributed deadlock.
> -------------------------------------------------------------------------
>
>                 Key: SOLR-7344
>                 URL: https://issues.apache.org/jira/browse/SOLR-7344
>             Project: Solr
>          Issue Type: Improvement
>          Components: SolrCloud
>            Reporter: Mark Miller
>         Attachments: SOLR-7344.patch
>
>




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