>Why do you send all your emails twice? 
I'm very sorry. The first one is because my network is not good,when I send the 
email to this webpage,I received a failed message(actually succeeded),so I 
resend the email.
The second one is because I write the email by computer,but my computer can't 
access this webpage,so I send the mail to my phone,then copy the mail to this 
webpage by phone. But The format is changed(can't see very well)so I delete it. 

>Most likely your application is not writing the >data into the file as it 
>grows, but it first creates a giant empty file with >all zeros, and then 
>it overwrites the zeros with the desired content. 
>
>S3QL then starts uploading the zeros before >your application is done 
>overwriting them (because it has no way of >knowing that this is not the 
>actual data). 
why S3QL only uploads the object "D" which size is same with "C". In this case 
I think it should send an all zeros odject which size is same with B,too.

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