Thanks for your reply. I install HBase in pseudo-mode. I think my situation is that the minor compaction promotes to major compaction. I have 3 HFiles for table 'test' in one RegionServer. After I issued compact (org.apache.hadoop.hbase.client.HBaseAdmin.compact()) method, those 3 HFiles are compacted into 1 HFile and deleted markers are discarded. That's why I feel there is no difference from minor compaction and major compaction.
regards! Yong On Fri, Apr 27, 2012 at 12:41 AM, lars hofhansl <lhofha...@yahoo.com> wrote: > The main practical difference is that only a major compaction cleans out > delete markers. > Delete markers cannot be removed during a minor compaction since an affected > KeyValue could exist in an HFile that is not part of this compaction. > > -- Lars > ________________________________ > > From: yonghu <yongyong...@gmail.com> > To: user@hbase.apache.org > Sent: Wednesday, April 25, 2012 11:48 PM > Subject: Are minor compaction and major compaction different in HBase 0.92? > > Hello, > > My HBase version is 0.92.0. And I find that when I use minor > compaction and major compaction to compact a table, there are no > differences. In the minor compaction, it will remove the deleted cells > and discard the exceeding data versions which should be the task of > major compaction. I wonder if these two compaction can do the same > work, why do we need both? I mean the minor compaction has already > done the job for major compaction, why we still need major compaction? > > Regards! > > Yong
