Hi bryan, WAL is used only during minor compaction. During major compaction WAL is not used.
Cheers, Manoj.P On Mon, Jul 2, 2012 at 11:00 PM, Bryan Keller <br...@vancameron.net> wrote: > During an upgrade of my cluster to 0.90 to 0.92 over the weekend, the WAL > (files in the /hbase/.logs directory) was corrupted and it prevented HBase > from starting up. The exact exception was "java.io.IOException: Could not > obtain the last block locations" on the WAL files. > > I was able to recover by deleting the /hbase/.logs directory. My question > is, if HBase had no pending updates, i.e. nothing writing to it, is there > any risk of data loss by deleting the WAL directory? For example, does > rebalancing, flushing, or compaction use the WAL or is the WAL used only > for inserts/updates/deletes? > >
