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[expand - 1 more] - Custom compaction - HBase - [mail # user]
...Is there a way to customize the compaction function (like a hook provided b y the API) or is it invisible to the user?  Thank you Vidhya ...
   Author: Vidhyashankar Venkatarama..., 2010-05-26, 22:56
Configs for Hbase compaction switch... - HBase - [mail # user]
...I want to run some experiments with the major compactions turned off..  There are two parameters that I can see both of which have to be modified t o turn major compactions off (am I right...
... here?). hbase.hstore.compactionThreshold and hbase.hregion.majorcompaction...  But the config file's comments say that setting compactionThreshold to a hi gh value may lead to memory issues...
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   Author: Vidhyashankar Venkatarama..., 2010-05-25, 14:06
[expand - 2 more] - Effect of turning major compactions off.. - HBase - [mail # user]
...Are there any side effects to turning major compactions off, other than jus t a hit in the read performance?  I was trying to merge a 120 Gig update (modify/insert/delete operations...
...) in to a 2 TB fully compacted Hbase table with 5 region servers using a map red uce job.. Each RS was serving around 2000 regions (256 MB max size)... Majo r compactions were turned off before...
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   Author: Vidhyashankar Venkatarama..., 2010-05-26, 16:07
[expand - 2 more] - Additional disk space required for Hbase compactions.. - HBase - [mail # user]
...Hi guys,   I am quite new to Hbase.. I am trying to figure out the max additional di sk space required for compactions..    If the set of small Hfiles amount to a size of U in total, before...
... a major  compaction happens and the 'behemoth' HFile has size M, assuming the resul tant size of the Hfile after compaction is U+M (worst case has only inserti ons) and a replication factor of r...
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   Author: Vidhyashankar Venkatarama..., 2010-05-17, 18:55
[expand - 1 more] - Questions on Region split.. - HBase - [mail # user]
...This is from the HBAse architecture page about region splits: "When a compaction is triggered in a child, the data from the parent is cop ied to the child. When both children have performed...
... a compaction, the paren t region is garbage collected. "  What happens during a region split when major compactions are disabled?  Also, the decision to split a region is based on the combined size...
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   Author: Vidhyashankar Venkatarama..., 2010-06-16, 21:49
Difference between config parameters... - HBase - [mail # user]
...Can you tell me the difference between hbase.hstore.compactionThreshold, hb ase.hstore.blockingStoreFiles and hbase.hstore.compaction.max?The first two seem very similar in their descri...
   Author: Vidhyashankar Venkatarama..., 2010-06-04, 21:51
Re: ideas to improve throughput of the base writting - HBase - [mail # user]
...Threshold and the number of column families (number of Stores)..  Reaching compactionThreshold would trigger compaction in a Store for a part icular region during which flushes will be disabled (which means...
... no more st ore files for this store until the compaction finishes).. Writes on other S tores in the same region will be happening until each of them reach compact ionThreshold after which...
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   Author: Vidhyashankar Venkatarama..., 2010-06-08, 00:08
Re: Question from HBase book: "HBase currently does not do well with anything about two or three column families" - HBase - [mail # user]
...Is there a JIRA for issuing flushes and compactions on a per column family  basis?   On 6/2/11 2:48 PM, "Stack"  wrote:  On Thu, Jun 2, 2011 at 2:40 PM, Leif Wickland  wrot e:  If you can...
   Author: Vidhyashankar Venkatarama..., 2011-06-02, 21:57
Re: OOME during frequent updates: log - HBase - [mail # user]
....apache.hadoop.hbase.regionserver.HRegion:  compaction completed on region DocData,108596007,1275586906692 in 0sec 2010-06-09 02:25:00,070 INFO org.apache.hadoop.hbase.regionserver.HRegion:  Starting compaction on region DocData,69478571...
....apache.hadoop.hbase.regionserver.Store: S tarted compaction of 2 file(s)  into /hbase/DocData/compaction.dir/14859693 33, seqid=778107 2010-06-09 02:25:00,112 DEBUG org.apache.hadoop.hbase.regionserver.Store: C ompleted compaction...
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   Author: Vidhyashankar Venkatarama..., 2010-06-09, 18:27
[expand - 2 more] - Re: OOME during frequent updates... - HBase - [mail # user]
... compactions.. Is this right?     Is it better to have fat regions (I am thinking 8-10 gigs) for a large n umber (100's) of nodes ?  V  On 6/9/10 4:15 PM, "Jean-Daniel Cryans"  wrote:  Mmm yeah wrote...
   Author: Vidhyashankar Venkatarama..., 2010-06-10, 06:29
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