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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Commented: (LUCENE-2573) Tiered flushing of DWPTs by RAM with low/high water marks
Date Mon, 06 Sep 2010 19:09:33 GMT

    [ https://issues.apache.org/jira/browse/LUCENE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=12906566#action_12906566
] 

Jason Rutherglen commented on LUCENE-2573:
------------------------------------------

The DWPT that happens to exceed the first tier, is flushed out.  This was easier to implement
than finding the highest RAM consuming DWPT and flushing it, from a different thread.

> Tiered flushing of DWPTs by RAM with low/high water marks
> ---------------------------------------------------------
>
>                 Key: LUCENE-2573
>                 URL: https://issues.apache.org/jira/browse/LUCENE-2573
>             Project: Lucene - Java
>          Issue Type: Improvement
>            Reporter: Michael Busch
>            Assignee: Michael Busch
>            Priority: Minor
>             Fix For: Realtime Branch
>
>         Attachments: LUCENE-2573.patch
>
>
> Now that we have DocumentsWriterPerThreads we need to track total consumed RAM across
all DWPTs.
> A flushing strategy idea that was discussed in LUCENE-2324 was to use a tiered approach:
 
> - Flush the first DWPT at a low water mark (e.g. at 90% of allowed RAM)
> - Flush all DWPTs at a high water mark (e.g. at 110%)
> - Use linear steps in between high and low watermark:  E.g. when 5 DWPTs are used, flush
at 90%, 95%, 100%, 105% and 110%.
> Should we allow the user to configure the low and high water mark values explicitly using
total values (e.g. low water mark at 120MB, high water mark at 140MB)?  Or shall we keep for
simplicity the single setRAMBufferSizeMB() config method and use something like 90% and 110%
for the water marks?

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