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From "Clint Morgan (JIRA)" <j...@apache.org>
Subject [jira] Updated: (HBASE-910) Scanner misses columns / rows when the scanner is obtained durring a memcache flush
Date Wed, 01 Oct 2008 20:35:44 GMT

     [ https://issues.apache.org/jira/browse/HBASE-910?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Clint Morgan updated HBASE-910:
-------------------------------

    Attachment: hbase-910.patch

patch to provoke the issue. The relevant piece of the log is:

2008-10-01 13:25:32,728 INFO org.apache.hadoop.hbase.TestScannerWhileMemcacheFlush: got scanner
2008-10-01 13:25:32,792 INFO org.apache.hadoop.hbase.TestScannerWhileMemcacheFlush: got scanner
2008-10-01 13:25:32,856 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Started memcache
flush for region table,,1222892721305. Current region memcache size 25.3k
2008-10-01 13:25:32,857 INFO org.apache.hadoop.hbase.TestScannerWhileMemcacheFlush: got scanner
2008-10-01 13:25:32,995 DEBUG org.apache.hadoop.hbase.regionserver.HStore: Added /user/clint.morgan/table/215004990/family/mapfiles/2754371528337048417
with 1000 entries, sequence id 1012, data size 25.3k, file size 39.4k
2008-10-01 13:25:32,996 DEBUG org.apache.hadoop.hbase.regionserver.HRegion: Finished memcache
flush for region table,,1222892721305 in 141ms, sequence id=1012, compaction requested=false
2008-10-01 13:25:32,997 WARN org.apache.hadoop.hbase.TestScannerWhileMemcacheFlush: Failing
assert


> Scanner misses columns / rows when the scanner is obtained durring a memcache flush
> -----------------------------------------------------------------------------------
>
>                 Key: HBASE-910
>                 URL: https://issues.apache.org/jira/browse/HBASE-910
>             Project: Hadoop HBase
>          Issue Type: Bug
>          Components: regionserver
>         Environment: latest trunk
>            Reporter: Clint Morgan
>            Priority: Critical
>         Attachments: hbase-910.patch
>
>
> I first noticed that some columns for a row were missing if they are coming from a scanner
that was obtained while a memecache flush on the region was in progress. I tried to write
a simple unit test to reproduce, however the problem I get in the unit test is that some rows
are being missed.

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