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From "Jason Rutherglen (JIRA)" <j...@apache.org>
Subject [jira] Updated: (LUCENE-2573) Tiered flushing of DWPTs by RAM with low/high water marks
Date Tue, 07 Sep 2010 18:10:33 GMT

     [ https://issues.apache.org/jira/browse/LUCENE-2573?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Jason Rutherglen updated LUCENE-2573:
-------------------------------------

    Attachment: LUCENE-2573.patch

* perDocAllocator is removed from DocumentsWriterRAMAllocator

* getByteBlock and getIntBlock always increments the numBytesUsed

The test that simply prints out debugging messages looks better.  I need to figure out unit
tests.

> 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, 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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