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Date: Wed, 25 May 2011 13:38:32 +0530
From: Sreehari G <sreehari.g@huawei.com>
Subject: HDFS-903 - Backupnode always downloading image from Namenode after
 this change
To: hdfs-dev@hadoop.apache.org
Reply-to: sreehari.g@huawei.com
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Hi all , 
 
In HDFS-903 - ( md5 verification of fsimage ) , with this change ,
Backupnode is downloading the image & edit files from namenode everytime
since the difference in checkpoint time is always maintined b/w Namenode and
Backupnode . This happens since Namenode is resetting its checkpoint time
everytime since we are ignoring renewCheckpointTime and passing true
explicitly to rollFsimage during endcheckpoint .. 
 
Also , though a proposal for using md5 to decide whether to download image
is also mentioned , it doesnt seeem to be implemented .. 
 
Isn't this downloading of image everytime a problem or am I missing
something ? 

HUAWEI TECHNOLOGIES CO.,LTD. huawei_logo 


Solitaire
Domlur
Bangalore
www.huawei.com
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<DIV><FONT size=2 face=Arial><SPAN class=082180208-25052011>Hi all , 
</SPAN></FONT></DIV>
<DIV><FONT size=2 face=Arial><SPAN 
class=082180208-25052011></SPAN></FONT>&nbsp;</DIV>
<DIV><FONT size=2 face=Arial><SPAN class=082180208-25052011>In HDFS-903 - ( md5 
verification of fsimage ) ,&nbsp;with&nbsp;</SPAN></FONT>this change , 
Backupnode is downloading the image &amp; edit files from namenode everytime 
since the difference in checkpoint time is always maintined b/w Namenode and 
Backupnode . This happens since Namenode is resetting its checkpoint time 
everytime since we are ignoring renewCheckpointTime and passing true explicitly 
to rollFsimage during endcheckpoint .. </DIV>
<DIV><FONT size=2 face=Arial></FONT>&nbsp;</DIV>
<DIV><SPAN class=082180208-25052011><FONT size=2 face=Arial>Also , though a 
proposal for using md5 to decide whether to download image is also mentioned , 
it doesnt seeem to be implemented .. </FONT></SPAN></DIV>
<DIV><FONT size=2 face=Arial></FONT>&nbsp;</DIV>
<DIV>Isn't this&nbsp;<SPAN class=082180208-25052011>downloading of image 
everytime </SPAN>a problem or am I missing something ? </DIV>
<P></P>
<P></P><FONT size=2 face=Arial></FONT><FONT color=gray size=2 face=Arial>HUAWEI 
TECHNOLOGIES CO.,LTD. </FONT><IMG id=ridImg hspace=0 alt=huawei_logo align=left 
src="cid:082180208@25052011-2713"> 
<P></P><FONT color=#808080 size=2 face=Arial></FONT><BR><FONT color=gray size=1 
face=Arial>Solitaire<BR>Domlur<BR>Bangalore<BR>www.huawei.com<BR></FONT><FONT 
color=gray size=1 
face=Arial>-------------------------------------------------------------------------------------------------------------------------------------<BR>This 
e-mail and its attachments contain confidential information from HUAWEI, which 
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use of the <BR>information contained herein in any way (including, but not 
limited to, total or partial <BR>disclosure, reproduction, or dissemination) by 
persons other than the intended <BR>recipient(s) is prohibited. If you receive 
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and delete it!<BR></FONT>
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