2010/3/10 <sallonch...@hotmail.com>: > Hi, everyone. I set up a hadoop cluster with 3 nodes: one mater and two > slaves. Recently I want to add a new node as a slave to it. After > configuration, the HDFS and HBase work, however, I found some tables in HBase > previously disappear. I browse hbase directory in HDFS and found directories > of the missing tables. Does anyone encounter the same situations or is there > someone can help me to recover these tables? thanks! >
Perhaps the node carrying the .META. region -- the catalog table that has table info -- was killed before it had time to flush its edits so added table edits were lost? You could playing with the ./bin/add_table.rb script. See the head of the script for how to use it. This should restore your tables by reading the content of the filesystem adding back the missing edits to .META.. In future, be careful how you close down your cluster. You could try flushing .META. first before running shutdown by doing the following in the shell: hbase> flush ".META." St.Ack
