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From yuzhih...@gmail.com
Subject Re: book in inconsistent regarding disabling - major compaction
Date Thu, 05 Jan 2012 11:44:19 GMT
Thanks for spotting this. 

Do you mind filing a Jira ?



On Jan 5, 2012, at 3:02 AM, Mikael Sitruk <mikael.sitruk@gmail.com> wrote:

> Hi all
> 
> It seems that the book has some inconsistencies regarding the way to
> disable major compactions
> 
> According to the book in chapter 2.6.1.1. HBase Default Configuration
> 
> hbase.hregion.majorcompaction - The time (in miliseconds) between 'major'
> compactions of all HStoreFiles in a region. Default: 1 day. *Set to 0 to
> disable automated major compactions*.
> 
> Default: 86400000 (
> http://hbase.apache.org/book.html#hbase_default_configurations)
> 
> According to the book at chapter 2.8.2.8. Managed Compactions
> 
> "A common administrative technique is to manage major compactions manually,
> rather than letting HBase do it. By default,
> HConstants.MAJOR_COMPACTION_PERIOD is one day and major compactions may
> kick in when you least desire it - especially on a busy system. *To "turn
> off" automatic major compactions set the value to Long.MAX_VALUE.*"
> According to the code org.apache.hadoop.hbase.regionserver.Store.java, "0"
> is the right answer.
> 
> 
> Regards,
> Mikael.S

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