Chris, Thank you for the very descriptive update.
On Sun, Dec 9, 2012 at 6:29 PM, Chris Waterson <[email protected]> wrote: > Well, I upgraded to 0.92.2, since the version I was running on (0.92.1) > didn't have those options for "hbck". > > That helped. > > It took me a while to realize that I had to make the root filesystem > writable so that "hbck > -repair" could create itself a directory. So, once that was done, it at > least ran through to completion. > > But the problem persisted in that there were blocks in META that didn't > exist on the filesystem. One poor region server was assigned the sad task > of attempting to open the non-existent directory, which it slavishly > reattempted again and again, filling its log with FileNotFoundException > stack traces. > > For example, > > 2012-12-09 00:14:33,315 ERROR > org.apache.hadoop.hbase.regionserver.handler.OpenRegionHandler: Failed open > of > region=referrers,com.free-hdwallpapers.www/wallpapers/animals/mici/595718.jpg|com.free-hdwallpapers.www/wallpaper/animals/husky/270579,1354964606745.0c54fe59c58ddd6b34042ec98171bff7. > java.io.FileNotFoundException: File does not exist: > /hbase/referrers/2cb553c74d52ddcbf31940f6c7128c63/main/33f1fd9efb944c4e982ba719cd7dde84 > etc., etc. > > In particular, the directory above "/hbase/referrers/2cb553...c63" simply > did not exist at all in HDFS. > > So I took matters into my own hands and created the missing > "/hbase/referrers/2cb553...c63" directory, its subdirectory "main", and > attempted to create a zero-length file "331fd9...e84". This changed the > firehose of exceptions from FileNotFoundException to CorruptHFileException. > > So, I wrote a small program to emit a valid, empty HFile, and proceeded to > place these files at whatever places in HDFS that a FileNotFoundException > was being thrown. After creating three or four of them, the exceptions > stopped. > > I then ran "hbck -repair" again, and upon completion it declared victory. > > Again, I suspect that I got myself into this problem because I ran a > machine out of disk space. It's likely that most folks are more clever > than me, and so this problem hasn't arisen before. :) > > > > > On Dec 9, 2012, at 3:00 PM, "Kevin O'dell" <[email protected]> > wrote: > > > can you run hbase hbck -fixMeta -fixAssignments > > > > This should assign those region servers and fix the hole. > > > > On Sat, Dec 8, 2012 at 11:30 PM, Chris Waterson <[email protected]> > wrote: > > > >> Hello! I've gotten myself into trouble where I'm missing files on HDFS > >> that HBase thinks ought to be there. In particular, running "hbase > hbck" > >> yields the below message: two regions are "not deployed on any region > >> server" (because there is no file in HDFS for the region), and "there > is a > >> hole in the region chain". > >> > >> (FWIW, I suspect that this problem is due to a recent incident where we > >> ran the cluster out of disk space.) > >> > >> I'm running 0.92.1, and have been staggering around trying to figure out > >> what procedure I ought to use to correct the problem, but my Google-fu > is > >> too poor to have yielded results. Any pointers would be appreciated! > >> > >> thanks, > >> chris > >> > >> > >> > >> > >> ERROR: Region > >> > referrers,com.free-hdwallpapers.www/wallpapers/animals/mici/595718.jpg|com.free-hdwallpapers.www/wallpaper/animals/husky/270579,1354964606745.0c54fe59c58ddd6b34042ec98171bff7. > >> not deployed on any region server. > >> ERROR: Region > >> > referrers,com.free-hdwallpapers.www/wallpapers/anime/mici/78285.jpg|com.free-hdwallpapers.www/wallpaper/anime/wolf-furry/90641,1354964606745.d2451e8db0f2b9546cc42c6d260a2ab8. > >> not deployed on any region server. > >> ERROR: There is a hole in the region chain between > >> > com.free-hdwallpapers.www/wallpapers/animals/mici/595718.jpg|com.free-hdwallpapers.www/wallpaper/animals/husky/270579 > >> and > >> > com.free-hdwallpapers.www/wallpapers/entertainment/mici/11840.jpg|com.free-hdwallpapers.www/wallpaper/entertainment/new-moon-bella-and-edward/12951. > >> You need to create a new regioninfo and region dir in hdfs to plug the > >> hole. > >> > >> > > > > > > -- > > Kevin O'Dell > > Customer Operations Engineer, Cloudera > > -- Kevin O'Dell Customer Operations Engineer, Cloudera
