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Posted to dev@hbase.apache.org by "Clint Morgan (JIRA)" <ji...@apache.org> on 2008/10/01 22:35:44 UTC
[jira] Updated: (HBASE-910) Scanner misses columns / rows when the
scanner is obtained durring a memcache flush
[ 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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