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RE: GC recommendations for large Region Server heaps - HBase - [mail # user]
...Suraj, what is the maximum GC pause you have observed in your cluster so far? I do not think s-t-w GC pause on 8GB heap will lasts longer than 5-8 secs.  Best regards, Vladimir Rodionov...
   Author: Vladimir Rodionov, 2013-07-08, 18:33
RE: optimizing block cache requests + eviction - HBase - [mail # user]
...Viral,   1. your data access pattern is random and uniform (no data locality at all) 2. or you trash block cache with scan operations with block cache enabled.  or both.  but ...
   Author: Vladimir Rodionov, 2013-07-08, 17:45
RE: Hbase random read performance - HBase - [mail # user]
...Boris if your working set does not fit comfortably into 0.4 * 9 * 12GB ~ 43GB HBase cluster block cache ( and I suppose it does not, because it is less than 1% of your data set  ) - you...
   Author: Vladimir Rodionov, 2013-07-08, 17:32
RE: Poor HBase random read performance - HBase - [mail # dev]
...My bad, Bloom filters won't help to locate most recent version of a column.  So, back to my favorite LevelDB ... To locate most recent  version of a column, LevelDB must check &nbs...
   Author: Vladimir Rodionov, 2013-07-02, 00:09
RE: difference between major and minor compactions? - HBase - [mail # user]
...Major compactions floods network, leaving for other operations too little space. The reason why major compaction are so prohibitively expensive in HBase - 2 block replicas which need to be c...
   Author: Vladimir Rodionov, 2013-06-22, 23:23
RE: Scan performance - HBase - [mail # user]
...Lars, I thought that column family is the locality group and placement columns which are frequently accessed together into the same column family (locality group) is the obvious performance ...
   Author: Vladimir Rodionov, 2013-06-22, 00:00
RegionServer Statistics does seem right (0.94.6) - HBase - [mail # dev]
...This is what I see on my RS stats page (/rs-status):  requestsPerSecond=0, numberOfOnlineRegions=292, numberOfStores=299, numberOfStorefiles=112, storefileIndexSizeMB=2, rootIndexSizeKB...
   Author: Vladimir Rodionov, 2013-06-21, 21:39
RE: memstore timestamp and visible timestamp - HBase - [mail # dev]
...Time can go backwards. One time a year. By one hour. I may be wrong but it seems that the situation described by TS (memTS1 > me mTS2 and ts1  To: [EMAIL PROTECTED] Cc: "[EMAIL PROTE...
   Author: Vladimir Rodionov, 2012-08-03, 21:27
RE: search metric about Hbase vs Oracle or Mysql - HBase - [mail # dev]
...I do not think you will find anything. HBase is not the replacement for Ora cle or MySQL. What are you going to compare? Single server performance? Any RDBMs properl y tuned will be faster b...
   Author: Vladimir Rodionov, 2012-07-10, 16:42
RE: Some suggestions for future features - HBase - [mail # dev]
...Scan implies scanning table and this is what I would like to avoid. I consi der "bulk" delete as a hint (internal filter) for HBase (RegionServer) execution of which can be deferred  un...
   Author: Vladimir Rodionov, 2012-06-06, 17:59
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