Have you looked at HBASE-16578 ? Cheers
> On Oct 12, 2016, at 8:02 AM, Tim Robertson <[email protected]> wrote: > > Hi devs, > [Had a quick chat with Lars G. about this and before opening a Jira I > thought I'd raise it here first] > > We have just experienced data loss in HBase 1.0.0-cdh5.4.10. > > Before I dig into this further, I'd like to just ask if anyone has seen > this before? > > The initial state was a table (tim_test) built with MOB support and a few > 10's million rows and 10's billions of cells. > > I wanted to rename the table to get this into production and did so as > follows: > > snapshot 'tim_test', 'tim_test-snapshot' > clone_snapshot 'tim_test-snapshot', 'prod_b_map' > > At this stage the application all looked good, and so I continued with: > > delete_snapshot 'tim_test-snapshot' > disable 'tim_test' > drop ‘tim_test’ > > Then things went... awry and data just started dropping out in the app. > Before long, all MOB data seemingly is gone. > > The references in the new table MOB folder appear to point to the source > table (e.g. > /hbase/mobdir/data/default/prod_b_map/ba42a2e8e9b669d9fc85bdfeed2f5f2a/EPSG_4326/tim_test=14bf5f1737ac65c34615ed97c0b7de06-d41d8cd98f00b204e9800998ecf8427e20161006ff8baa70d21f408caefe8ae6318dfba2). > > The RS logs full of ERROR like: > > 2016-10-12 15:19:14,640 ERROR org.apache.hadoop.hbase.regionserver.HStore: > The mob file > d41d8cd98f00b204e9800998ecf8427e20161006b59865f80e604781a79ebfa2ddd66b48 > could not be found in the locations > [hdfs://ha-nn/hbase/mobdir/data/default/tim_test/14bf5f1737ac65c34615ed97c0b7de06/EPSG_4326, > hdfs://ha-nn/hbase/archive/data/default/tim_test/14bf5f1737ac65c34615ed97c0b7de06/EPSG_4326] > > What I don't know is: > 1) was this running a background task to copy the MOB data when the > snapshot was cloned and I just deleted the source before the copy was > complete? > - or > 2) when running "snapshot and clone" it just references the source MOB > data until a (?) change? > 3) snapshot and clone just doesn't support MOB? > > Can anyone shed some light on this easily before I dig into it please? > > While this situation exists (at least in 1.0.0) might it be good to get > info about data loss for MOB tables into the snapshot clone docs? > > Thanks, > Tim
