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From "ASF subversion and git services (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (LUCENE-6063) Allow overriding ConcurrentMergeScheduler's denial-of-service protection
Date Wed, 19 Nov 2014 00:03:34 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-6063?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14217085#comment-14217085
] 

ASF subversion and git services commented on LUCENE-6063:
---------------------------------------------------------

Commit 1640456 from [~mikemccand] in branch 'dev/trunk'
[ https://svn.apache.org/r1640456 ]

LUCENE-6063: allow overriding whether/how ConcurrentMergeScheduler stalls incoming threads
when merges are falling behind

> Allow overriding ConcurrentMergeScheduler's denial-of-service protection
> ------------------------------------------------------------------------
>
>                 Key: LUCENE-6063
>                 URL: https://issues.apache.org/jira/browse/LUCENE-6063
>             Project: Lucene - Core
>          Issue Type: Improvement
>          Components: core/index
>            Reporter: Michael McCandless
>            Assignee: Michael McCandless
>             Fix For: 5.0, Trunk
>
>         Attachments: LUCENE-6063.patch
>
>
> In LUCENE-5310 we explored improving CMS/SMS sharing/concurrency, but
> the issue never "converged", so I want to break out one small part of
> it here: the ability to override CMS's default "aggressive"
> denial-of-service protection where it forcefully stalls the incoming
> threads that are responsible for creating too many segments.
> More advanced applications can more gracefully handle the "too many
> merges" by e.g. slowing down the incoming indexing rate at a higher
> level.



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