Hi, I'm currently struggling with the PerformanceEvaluation MR job given as an example on http://wiki.apache.org/hadoop/Hbase/MapReduce. I'm getting the problems already described a few months ago on hadoop-core-user ("HBase PerformanceEvaluation failing", 15. Nov 07: job exits with java.io.Exception - maybe a memory issue in my case - afterwards hadoop fsck says CORRUPT)
The first time this happened, I couldn't start hbase afterwards; there seemed to be a problem with the -ROOT- table. In the end the only way I could get things going again was deleting all of my data and starting from scratch. Unfortunately I've chucked away the logfiles in order to have a clean reproduction of the problem on my newly reformatted hadoop system - as you might have guessed, while PerformanceEvaluation keeps exiting, HBase hasn't quit service since. And now there is a new phenomenon: -> I did "drop table TestTable;" in the HQL-Shell (TestTable is the table created by PerformanceEvaluation) -> The shell said "1 table(s) dropped successfully" -> But now I have 2 orphaned TestTable regions on one of my RegionServers that won't go away. When I try to run PerformanceEvaluation it gives me hbase.TableExistsException, when I try to get rid of TestTable in the shell it tells me that the table doesn't exist. Any hints on how to deal with that? micha
