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https://issues.apache.org/jira/browse/HBASE-4570?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Todd Lipcon updated HBASE-4570:
-------------------------------
Attachment: hbase-4570.txt
> Scan ACID problem with concurrent puts.
> ---------------------------------------
>
> Key: HBASE-4570
> URL: https://issues.apache.org/jira/browse/HBASE-4570
> Project: HBase
> Issue Type: Bug
> Components: client, regionserver
> Affects Versions: 0.90.1, 0.90.3
> Reporter: Jonathan Hsieh
> Attachments: 4570-instrumentation.tgz, hbase-4570.tgz, hbase-4570.txt
>
>
> 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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