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From Raghu Angadi <rang...@yahoo-inc.com>
Subject Re: [jira] Updated: (HADOOP-1180) NNbench test should be able to test the checksumfilesystem as well as the raw filesystem
Date Thu, 29 Mar 2007 21:48:35 GMT
Nigel Daley wrote:
> So shouldn't fixing this test to conform to the new model in HADOOP-1134 
> be the concern of the patch for HADOOP-1134?  As it stand, I can't run 
> NNBench at scale without using a raw file system, which is what this 
> patch is intended to allow.  HADOOP-928 caused this test to use a 
> ChecksumFileSystem and subsequently we saw our "read" TPS metric plummet 
> from 20,000 to a couple hundred.

Wow! this would be a good test for 1134. I didn't expect the TPS to be 
so different. I would expect TPS to remain closer to 20000 with CRCs 
with 1134


> Let's get our current benchmark back on track before we commit 
> HADOOP-1134 (which will likely take a while before it is "Patch 
> Available").
> On Mar 29, 2007, at 11:29 AM, Doug Cutting (JIRA) wrote:
>>      [ 
>> https://issues.apache.org/jira/browse/HADOOP-1180?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel

>> ]
>> Doug Cutting updated HADOOP-1180:
>> ---------------------------------
>>     Status: Open  (was: Patch Available)
>> -1 This patch may be rendered obsolete by HADOOP-1134.  And, the way 
>> it is written, the 'useChecksum=false' mode will silently fail to work 
>> once HADOOP-1134 is completed.  So, if we feel we'll want to continue 
>> to support this feature after HADOOP-1134, then we should add an 
>> explicit way of constructing an HDFS FileSystem that does not perform 
>> checksumming, rather than relying on 'instanceof ChecksumFileSystem'.
>>> NNbench test should be able to test the checksumfilesystem as well as 
>>> the raw filesystem
>>> ----------------------------------------------------------------------------------------

>>>                 Key: HADOOP-1180
>>>                 URL: https://issues.apache.org/jira/browse/HADOOP-1180
>>>             Project: Hadoop
>>>          Issue Type: Bug
>>>          Components: dfs
>>>            Reporter: dhruba borthakur
>>>         Assigned To: dhruba borthakur
>>>         Attachments: nnbench.patch
>>> The NNbench test should have the option of testing a file system with 
>>> checksums turned on and with checksums turned off. The original 
>>> behaviour of nnbench test was to test hdfs without checksums.
>> --This message is automatically generated by JIRA.
>> -
>> You can reply to this email to add a comment to the issue online.

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