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Major vs Minor compactions - HBase - [mail # user]
...Hi,  I am working on some compaction coprocessors for a column family with versions set to 1. I am using the preCompact hook to wrap a scanner around the compaction scanner.  I wanted...
... to know what to expect from the minor compaction output. Can I assume the following: 1) Versions for each cell will be 1 2) Delete markers will be retained 3) Corresponding versions older than...
   Author: Varun Sharma, 2013-05-29, 20:27
Re: Question about compactions - HBase - [mail # user]
...Hi,  A few pointers: http://search-hadoop.com/m/heoc617XV29/otis+compactions&subj=Re+How+to+check+if+a+major_compact+is+done+ http://search-hadoop.com/m/BDx4S1jMjF92/otis+compactions&subj...
...=How+to+know+it+s+time+for+a+major+compaction+ http://search-hadoop.com/m/9oN1DqPx2R1/otis+compactions&subj=Compaction+throttling+and+per+region+compaction+automation http...
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   Author: Otis Gospodnetic, 2013-03-22, 01:13
Did major compaction really happen? - HBase - [mail # user]
...In order to turn off major compaction, I set MAJOR_COMPACTION_PERIOD to 0. However, I checked region server log, saw major compaction “happened"  quite often:   2013-12-17 01:44:45,085 INFO...
... org.apache.hadoop.hbase.regionserver.Store: Completed major compaction of 4 file(s) in cf1 of my_table,75,1387269666255.a6b0df058bf97f2f0efe1ed75f445a2c. into b23af74c66d8477b963750feed19ef23...
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   Author: branky, 2013-12-20, 04:49
Re: HBase without compactions? - HBase - [mail # user]
...He asked for a compactionless version.  You still have compactions w a stripe compaction.    On Feb 18, 2013, at 10:54 PM, Ted Yu  wrote:  ...
   Author: Michael Segel, 2013-02-19, 05:46
Problem In Understanding Compaction Process - HBase - [mail # user]
...Hi: Guys        I have some problem in understanding the compaction process, Can someone shed some light on me, much appreciate. Here is the problem:        Region Server after successfully...
... generate the final compacted file, it going through two steps:        1. move the above compacted file into region's directory        2. delete replaced files.         the above two steps...
   Author: Anty, 2013-02-20, 03:10
Never ending major compaction? - HBase - [mail # user]
..., and there is a lot of horsepower behind it.  I asked a major_compaction few hours ago. Let's say, about 5 hours ago. and it's still compacting! But all servers activities seems to be null. CPU usage...
... is almost 0.  There is nothing on the master logs.  How can I see what's going on? Is there a way to see the compaction queue?  JM ...
   Author: Jean-Marc Spaggiari, 2013-01-01, 19:42
Checking major compaction - HBase - [mail # user]
...Hi all,  Is there a way to check if major compaction is running or not on a table.  Thank you Kiran Sarvabhotla  ...
   Author: kiran, 2012-10-18, 06:12
Smart Managed Major Compactions - HBase - [mail # user]
...Hello all,   Before I start, I'm running cdh3u2, so 0.90.4.  I am looking into managing major compactions ourselves, but there doesn't appear to be any mechanisms I can hook in to determine...
... which tables need compacting.  Ideally each time my cron job runs it would compact the table with the next longest time since compaction, but I can't find a way to access this metric...
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   Author: Bryan Beaudreault, 2012-07-18, 17:26
Restrictions during compactions - HBase - [mail # user]
...Hello,  I'm a newbie and wondering whether or not there is any restriction during HBase minor/major compactions. I read the online document but could not find any explicit mention about...
... restrictions. What I'm mostly worrying about is whether read/write operations are blocked during compactions.  The description about 'hbase.hstore.blockingWaitTime':  The time an HRegion will block...
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   Author: Takahiko Kawasaki, 2012-05-23, 13:15
Schedule major compaction programmatically - HBase - [mail # user]
...I would like to schedule major compaction on a region programmatically. I found the API call below which can properly achieve my goal.  HBaseAdmin.majorCompact(String table...
...OrRegionName)  It turns out to be an asynchronous call and there seems no call back parameter that can be specified. How can I validate the compaction result (e.g., success or failure) ?  Thanks Chen ...
   Author: Chen Song, 2012-05-17, 18:11
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