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From Mikael Sitruk <mikael.sit...@gmail.com>
Subject book in inconsistent regarding disabling - major compaction
Date Thu, 05 Jan 2012 11:02:09 GMT
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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