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major_compact progress report ? - HBase - [mail # user]
...Hello,  I'm trying to apply major_compact on some of my tables to enable GZ  compression on the fly.  when I do:  $ major_compact 'table"  I don't see any info and I know how to follow...
... the progress of the  compaction. Is it instantaneous (I guess not)? Is there a log file  where I can see the progress of the operation?  When I count the number of regions of my table, it is still...
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2 emails [+ more]    Author: Vincent Barat, 2010-02-08, 16:23
compaction does not reduce the number of regions - HBase - [mail # user]
...Hi guys,  We have a table which stored previously uncompressed data which we changed to store GZ-compressed data. We performed a compaction on that table which shrank its size three...
...-fold. However, I noticed that compaction reduced the size of the region, but did not reduce the number of regions.  My questions is: 1. How does the scan performance (and also random read performance...
3 emails [+ more]    Author: Boris Aleksandrovsky, 2010-02-11, 17:59
On source code of File Section mechanism in minor compaction - HBase - [mail # user]
...Hi, All I am asking the source code showing the file selection mechanism for minor compaction in HBase. I am aware that HBase minor compaction selects file based on size and generation time...
5 emails [+ more]    Author: yun peng, 2013-04-11, 14:52
Re: Getting the scan type at preCompact - HBase - [mail # user]
...Asaf: I guess you're suggesting that we pass ScanType into preCompact() similar to what we pass into preCompactScannerOpen():                .preCompactScannerOpen(store, scanners...
...,                    majorCompaction ? ScanType.MAJOR_COMPACT : ScanType. MINOR_COMPACT, earliestPutTs); Mind filing a JIRA ?  Thanks  On Tue, Jan 29, 2013 at 10:21 AM, Asaf Mesika  wrote:  ...
10 emails [+ more]    Author: Ted Yu, 2013-01-29, 18:33
Best way to compact a region after a move? - HBase - [mail # user]
...Hi,  When I'm balancing manually the regions on my cluster, and I want to make sure they are local, so I want to major_compact them each time I'm moving them.  On the balanceCluster method...
..., we are returning a list of region to move. Which mean they are not yet moved, so I can't compact them there.  Is there a place where I shoud hook to compact those regions?  So far, the only...
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7 emails [+ more]    Author: Jean-Marc Spaggiari, 2012-12-30, 16:25
HBase client locks application during major compactions - HBase - [mail # user]
... figured out that it was caused by/happening during major compactions.  We have automated major compactions disabled and are running them manually on each table sequentially each day starting at 4...
... at the logs in HBase show that the compactions are occurring and this warning repeatedly while the compactions are occurring,  WARN org.apache.hadoop.ipc.HBaseServer: IPC Server Responder, call get...
5 emails [+ more]    Author: Baugher,Bryan, 2012-12-28, 17:40
Re: How to know it's time for a major compaction? - HBase - [mail # user]
...Thanks confirmation, Kevin.  I logged HBASE-7340 so that user doesn't have to script for compaction.  On Wed, Dec 12, 2012 at 12:30 PM, Kevin O'dell wrote:  ...
7 emails [+ more]    Author: Ted Yu, 2012-12-12, 20:36
Filtering/Collection columns during Major Compaction - HBase - [mail # user]
...Hi,  My understanding of major compaction is that it rewrites one store file and does a merge of the memstore, store files on disk and cleans out delete tombstones and puts prior to them...
... the major compaction which can be run daily too. I see, from the code that a major compaction essentially invokes a Scan over the region - so if the Scan is invoked with the appropriate filter (say...
12 emails [+ more]    Author: Varun Sharma, 2012-12-10, 13:58
Minor compactions and impact of number of HFiles within a Store - HBase - [mail # user]
...Hi there,  I was about to tune major/minor compaction behavior and I'm wondering what are the exact (negative) aspects of handling lots (let say between 3 and 20) HFiles within a single...
... could it be critical ? - Do the minor compactions help reducing major compaction time ? (e.g. for a same data volume, is it faster to merge 3 files rather than 20 files ?) - Considering I have...
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   Author: Adrien Mogenet, 2012-12-08, 19:19
Re: How to check if a major_compact is done? - HBase - [mail # user]
...Hi, as I recently find out, by spinning on  getStorefiles = task.getStores() may not be a robust method to check if a compaction is done. For instance, if the interval for checking is set...
... too large and there are compaction and flushes intertwined together, then in the end,  getStorefiles() may not be equal to task.getStores() even when compaction is done.  Currently, I have...
15 emails [+ more]    Author: yun peng, 2012-11-17, 01:03
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