Scan ACID problem with concurrent puts.
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Key: HBASE-4570
URL: https://issues.apache.org/jira/browse/HBASE-4570
Project: HBase
Issue Type: Bug
Components: client, regionserver
Affects Versions: 0.90.3, 0.90.1
Reporter: Jonathan Hsieh
When scanning a table sometimes rows that have multiple column families get
split into two rows if there are concurrent writes. In this particular case we
are overwriting the contents of a Get directly back onto itself as a Put.
For example, this is a two cf row (with "f1", "f2", .. "f9" cfs). It is
actually returned as two rows (#55 and #56). Interestingly if the two were
merged we would have a single proper row.
Row row0000024461 had time stamps: [55:
keyvalues={row0000024461/f0:data/1318200440867/Put/vlen=1000,
row0000024461/f0:qual/1318200440867/Put/vlen=10,
row0000024461/f1:data/1318200440867/Put/vlen=1000,
row0000024461/f1:qual/1318200440867/Put/vlen=10,
row0000024461/f2:data/1318200440867/Put/vlen=1000,
row0000024461/f2:qual/1318200440867/Put/vlen=10,
row0000024461/f3:data/1318200440867/Put/vlen=1000,
row0000024461/f3:qual/1318200440867/Put/vlen=10,
row0000024461/f4:data/1318200440867/Put/vlen=1000,
row0000024461/f4:qual/1318200440867/Put/vlen=10},
56: keyvalues={row0000024461/f5:data/1318200440867/Put/vlen=1000,
row0000024461/f5:qual/1318200440867/Put/vlen=10,
row0000024461/f6:data/1318200440867/Put/vlen=1000,
row0000024461/f6:qual/1318200440867/Put/vlen=10,
row0000024461/f7:data/1318200440867/Put/vlen=1000,
row0000024461/f7:qual/1318200440867/Put/vlen=10,
row0000024461/f8:data/1318200440867/Put/vlen=1000,
row0000024461/f8:qual/1318200440867/Put/vlen=10,
row0000024461/f9:data/1318200440867/Put/vlen=1000,
row0000024461/f9:qual/1318200440867/Put/vlen=10}]
I've only tested this on 0.90.1+patches and 0.90.3+patches, but it is
consistent and duplicatable.
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