Hello, I have a question regarding the behavior of HBase at startup time. First the region servers load all regions of enabled tables, then a batch task of (minor?) compression is made on some of these regions:
2008-12-17 11:04:46,688 INFO org.apache.hadoop.hbase.regionserver.HRegion: starting compaction on region test-D-0.3,GST13927+129099482919-13927,1229196632010 2008-12-17 11:05:36,196 INFO org.apache.hadoop.hbase.regionserver.HRegion: compaction completed on region test-D-0.3,GST13927+129099482919-13927,1229196632010 in 49sec What are the concerned regions ? All of them ? Only the region that have been modified during the last roll of log ? In my case it takes several hours to complete, since I have about 500 regions for 2 region servers. And if I have well understood how hadoop works, it yield that the entire hdfs content is rewritten during this phase, since the file are written once. Isn't it ? If I disable and re-enable a table, must the compactions re-run ? Thanks for your answers -- Jean-Adrien Cluster info: hadoop: 0.18.1 hbase: 0.18.0 (jar of hadoop replaced with 0.18.1) -- View this message in context: http://www.nabble.com/HBase-behaviour-at-startup-%28compression%29-tp21051218p21051218.html Sent from the HBase User mailing list archive at Nabble.com.
