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From "Earwin Burrfoot (JIRA)" <>
Subject [jira] [Commented] (LUCENE-2571) Indexing performance tests with realtime branch
Date Fri, 15 Apr 2011 07:16:06 GMT


Earwin Burrfoot commented on LUCENE-2571:

bq. Merges are NOT blocking indexing on trunk no matter which MP you use.
Well.. merges tie up IO (especially if not on fancy SSDs/RAIDs), which in turn lags flushes
-> bigger delays for stop the world flushes / lower bandwith cap (after which they are
forced to stop the world) for parallel flushes.

So Lance's point is partially valid.

> Indexing performance tests with realtime branch
> -----------------------------------------------
>                 Key: LUCENE-2571
>                 URL:
>             Project: Lucene - Java
>          Issue Type: Task
>          Components: Index
>            Reporter: Michael Busch
>            Priority: Minor
>             Fix For: Realtime Branch
>         Attachments: wikimedium.realtime.Standard.nd10M_dps.png, wikimedium.realtime.Standard.nd10M_dps_addDocuments.png,
wikimedium.realtime.Standard.nd10M_dps_addDocuments_flush.png, wikimedium.trunk.Standard.nd10M_dps.png,
> We should run indexing performance tests with the DWPT changes and compare to trunk.
> We need to test both single-threaded and multi-threaded performance.
> NOTE:  flush by RAM isn't implemented just yet, so either we wait with the tests or flush
by doc count.

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