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From "jiraposter@reviews.apache.org (Commented) (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-2856) TestAcidGuarantee broken on trunk
Date Thu, 27 Oct 2011 05:43:33 GMT

    [ https://issues.apache.org/jira/browse/HBASE-2856?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13136793#comment-13136793
] 

jiraposter@reviews.apache.org commented on HBASE-2856:
------------------------------------------------------



bq.  On 2011-10-17 06:06:23, Kannan Muthukkaruppan wrote:
bq.  > Amit: Did you rebase before uploading the new patch. That, unfortunately, is making
it hard to isolate the changes between r6 and r7. Will review tomorrow morning.
bq.  > 
bq.  > But I did read your description about the issues you mentioned. 
bq.  > 
bq.  > Regarding (b)-- we had already discussed in person. That makes sense.
bq.  > 
bq.  > And really nice catch on (a) too!! That is indeed subtle and tricky. Super!!!
bq.  >
bq.  
bq.  Amitanand Aiyer wrote:
bq.      Looks like a lot has changed since the original revision that I based my first patch
off.
bq.      
bq.      Please disregard v7.
bq.      
bq.      Let me submit these modifications as a separate diff. I have a sub-jira created for
each part.
bq.      
bq.

Seems like we are all basically +1 on this patch upto to some point - could we commit till
there? We can add the other changes as separate tasks under the same umbrella task. 

The other diffs are based on this diff... and they are separate issues from what this is addressing
(persisting memstoreTS). Its getting confusing if we keep adding to this diff.


- Karthik


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On 2011-10-15 04:08:41, Amitanand Aiyer wrote:
bq.  
bq.  -----------------------------------------------------------
bq.  This is an automatically generated e-mail. To reply, visit:
bq.  https://reviews.apache.org/r/2224/
bq.  -----------------------------------------------------------
bq.  
bq.  (Updated 2011-10-15 04:08:41)
bq.  
bq.  
bq.  Review request for Ted Yu, Michael Stack, Kannan Muthukkaruppan, and Karthik Ranganathan.
bq.  
bq.  
bq.  Summary
bq.  -------
bq.  
bq.  address the 2856 issues by writing the memstoreTS to the disk.
bq.  
bq.  version v11 of the patch.
bq.  
bq.  uploading it here for easier review process.
bq.  
bq.  
bq.  This addresses bug HBASE-2856.
bq.      https://issues.apache.org/jira/browse/HBASE-2856
bq.  
bq.  
bq.  Diffs
bq.  -----
bq.  
bq.    /pom.xml 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/io/hfile/AbstractHFileReader.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV1.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/io/hfile/HFileReaderV2.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/io/hfile/HFileWriterV2.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ColumnCount.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ColumnTracker.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ExplicitColumnTracker.java 1183581

bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/MemStore.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ReadWriteConsistencyControl.java
1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ScanQueryMatcher.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/ScanWildcardColumnTracker.java
1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/Store.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/StoreFile.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/StoreFileScanner.java 1183581 
bq.    /src/main/java/org/apache/hadoop/hbase/regionserver/StoreScanner.java 1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/HBaseTestingUtility.java 1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/TestAcidGuarantees.java 1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/io/hfile/TestCacheOnWrite.java 1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/io/hfile/TestHFileWriterV2.java 1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/regionserver/TestExplicitColumnTracker.java
1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/regionserver/TestFSErrorsExposed.java 1183581

bq.    /src/test/java/org/apache/hadoop/hbase/regionserver/TestScanWildcardColumnTracker.java
1183581 
bq.    /src/test/java/org/apache/hadoop/hbase/regionserver/TestStoreFile.java 1183581 
bq.  
bq.  Diff: https://reviews.apache.org/r/2224/diff
bq.  
bq.  
bq.  Testing
bq.  -------
bq.  
bq.  mvn test
bq.  
bq.  
bq.  Thanks,
bq.  
bq.  Amitanand
bq.  
bq.


                
> TestAcidGuarantee broken on trunk 
> ----------------------------------
>
>                 Key: HBASE-2856
>                 URL: https://issues.apache.org/jira/browse/HBASE-2856
>             Project: HBase
>          Issue Type: Bug
>    Affects Versions: 0.89.20100621
>            Reporter: ryan rawson
>            Assignee: Amitanand Aiyer
>            Priority: Blocker
>             Fix For: 0.94.0
>
>         Attachments: 2856-v2.txt, 2856-v3.txt, 2856-v4.txt, 2856-v5.txt, acid.txt
>
>
> TestAcidGuarantee has a test whereby it attempts to read a number of columns from a row,
and every so often the first column of N is different, when it should be the same.  This is
a bug deep inside the scanner whereby the first peek() of a row is done at time T then the
rest of the read is done at T+1 after a flush, thus the memstoreTS data is lost, and previously
'uncommitted' data becomes committed and flushed to disk.
> One possible solution is to introduce the memstoreTS (or similarly equivalent value)
to the HFile thus allowing us to preserve read consistency past flushes.  Another solution
involves fixing the scanners so that peek() is not destructive (and thus might return different
things at different times alas).

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