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From "churro morales (JIRA)" <j...@apache.org>
Subject [jira] [Created] (HBASE-19528) Major Compaction Tool
Date Fri, 15 Dec 2017 22:24:01 GMT
churro morales created HBASE-19528:
--------------------------------------

             Summary: Major Compaction Tool 
                 Key: HBASE-19528
                 URL: https://issues.apache.org/jira/browse/HBASE-19528
             Project: HBase
          Issue Type: New Feature
            Reporter: churro morales
            Assignee: churro morales
             Fix For: 2.0.0, 3.0.0


The basic overview of how this tool works is:

Parameters:

    Table

    Stores

    ClusterConcurrency

    Timestamp


So you input a table, desired concurrency and the list of stores you wish to major compact.
 The tool first checks the filesystem to see which stores need compaction based on the timestamp
you provide (default is current time).  It takes that list of stores that require compaction
and executes those requests concurrently with at most N distinct RegionServers compacting
at a given time.  Each thread waits for the compaction to complete before moving to the next
queue.  If a region split, merge or move happens this tool ensures those regions get major
compacted as well. 

This helps us in two ways, we can limit how much I/O bandwidth we are using for major compaction
cluster wide and we are guaranteed after the tool completes that all requested compactions
complete regardless of moves, merges and splits. 



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