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From "Jonathan Hsieh (JIRA)" <j...@apache.org>
Subject [jira] [Comment Edited] (HBASE-10079) Increments lost after flush
Date Thu, 05 Dec 2013 05:20:39 GMT

    [ https://issues.apache.org/jira/browse/HBASE-10079?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13839836#comment-13839836
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Jonathan Hsieh edited comment on HBASE-10079 at 12/5/13 5:20 AM:
-----------------------------------------------------------------

This was useful. Specifically the "don't consume the buffer" section was applicable.
http://worldmodscode.wordpress.com/2012/12/14/the-java-bytebuffer-a-crash-course/


was (Author: jmhsieh):
This was useful. Specifically the "don't consume the buffer" section was applicable.

> Increments lost after flush 
> ----------------------------
>
>                 Key: HBASE-10079
>                 URL: https://issues.apache.org/jira/browse/HBASE-10079
>             Project: HBase
>          Issue Type: Bug
>          Components: regionserver
>    Affects Versions: 0.96.1
>            Reporter: Jonathan Hsieh
>            Assignee: Jonathan Hsieh
>            Priority: Blocker
>             Fix For: 0.98.0, 0.96.1, 0.99.0
>
>         Attachments: 10079.v1.patch, hbase-10079.v2.patch
>
>
> Testing 0.96.1rc1.
> With one process incrementing a row in a table, we increment single col.  We flush or
do kills/kill-9 and data is lost.  flush and kill are likely the same problem (kill would
flush), kill -9 may or may not have the same root cause.
> 5 nodes
> hadoop 2.1.0 (a pre cdh5b1 hdfs).
> hbase 0.96.1 rc1 
> Test: 250000 increments on a single row an single col with various number of client threads
(IncrementBlaster).  Verify we have a count of 250000 after the run (IncrementVerifier).
> Run 1: No fault injection.  5 runs.  count = 250000. on multiple runs.  Correctness verified.
 1638 inc/s throughput.
> Run 2: flushes table with incrementing row.  count = 246875 !=250000.  correctness failed.
 1517 inc/s throughput.  
> Run 3: kill of rs hosting incremented row.  count = 243750 != 250000. Correctness failed.
  1451 inc/s throughput.
> Run 4: one kill -9 of rs hosting incremented row.  246878.!= 250000.  Correctness failed.
1395 inc/s (including recovery)



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