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From Doug Meil <doug.m...@explorysmedical.com>
Subject Re: Clarification regarding major compaction logic
Date Sun, 23 Sep 2012 20:34:17 GMT

Hi there, for background on the file selection algorithm for compactions,
see...

http://hbase.apache.org/book.html#regions.arch

9.7.5.5. Compaction






On 9/23/12 9:59 AM, "Monish r" <monishsvce@gmail.com> wrote:

>Hi guys,
>
>i would like to clarify the following regarding Major Compaction
>
>1) When TTL is set for a column family and major compaction is triggered
>by
>user
>
>- Does it act on the region only when *time since last major compaction is
>> TTL.*
>*
>*
>
>2) Does major compaction go through the index of a region to find out that
>there is data to be acted upon and then start the rewriting  ( or ) does
>it
>rewrite without any pre checks about the data  inside the region ?
>
>3) If major compaction for a region results in a empty region , does the
>empty region get deleted or left as such ?
>
>Regards,
>R.Monish



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