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From "Jingcheng Du (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-16981) Expand Mob Compaction Partition policy from daily to weekly, monthly and beyond
Date Tue, 15 Nov 2016 10:17:59 GMT

    [ https://issues.apache.org/jira/browse/HBASE-16981?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15666761#comment-15666761
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Jingcheng Du commented on HBASE-16981:
--------------------------------------

Thanks Anoop.
bq. One quick Q is what if policy is monthly? The major compaction will happen only once in
a month? Or say it is yearly then till end of the year only minor compactions? WHat abt #files
issue then?
The frequency of the mob compaction is not related with the partition policy.
The partition policy tells how to group mob files. For example if we define a yearly policy,
the mob files within the same year would be regarded as a group and compacted together as
one or several new files. The frequency is defined by the interval in configurations, it tells
how often such compactions run, and is not related with the policy.

> Expand Mob Compaction Partition policy from daily to weekly, monthly and beyond
> -------------------------------------------------------------------------------
>
>                 Key: HBASE-16981
>                 URL: https://issues.apache.org/jira/browse/HBASE-16981
>             Project: HBase
>          Issue Type: New Feature
>          Components: mob
>    Affects Versions: 2.0.0
>            Reporter: huaxiang sun
>            Assignee: huaxiang sun
>         Attachments: HBASE-16981.master.001.patch, HBASE-16981.master.002.patch, Supportingweeklyandmonthlymobcompactionpartitionpolicyinhbase.pdf
>
>
> Today the mob region holds all mob files for all regions. With daily partition mob compaction
policy, after major mob compaction, there is still one file per region daily. Given there
is 365 days in one year, at least 365 files per region. Since HDFS has limitation for number
of files under one folder, this is not going to scale if there are lots of regions. To reduce
mob file number,  we want to introduce other partition policies such as weekly, monthly to
compact mob files within one week or month into one file. This jira is create to track this
effort.



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