Well, if I think about, image corruption might not happen, since each checkpoint initiation would have unique number.
I was just wondering what would happen in this case Consider this scenario. Time 1 <-- SN1 asks NN image and edits to merge Time 2 <-- SN2 asks NN image and edits to merge Time 2 <-- SN2 returns new image Time 3 <-- SN1 returns new image. I am not sure what happens here, but its best to test it out before setting up something like this. And if you have multiple entries in NN file, then one SNN checkpoint would update all NN entries, so redundant SNN isnt buying you much. Thanks, Lohit ----- Original Message ---- From: Sagar Naik <[EMAIL PROTECTED]> To: core-user@hadoop.apache.org Sent: Tuesday, November 25, 2008 4:32:26 PM Subject: Re: 64 bit namenode and secondary namenode & 32 bit datanode lohit wrote: > I might be wrong, but my assumption is running SN either in 64/32 shouldn't > matter. > But I am curious how two instances of Secondary namenode is setup, will both > of them talk to same NN and running in parallel? > what are the advantages here. > I just have multiple entries master file. I am not aware of image corruption (did not take look into it). I did for SNN redundancy Pl correct me if I am wrong Thanks Sagar > Wondering if there are chances of image corruption. > > Thanks, > lohit > > ----- Original Message ---- > From: Sagar Naik <[EMAIL PROTECTED]> > To: core-user@hadoop.apache.org > Sent: Tuesday, November 25, 2008 3:58:53 PM > Subject: 64 bit namenode and secondary namenode & 32 bit datanode > > I am trying to migrate from 32 bit jvm and 64 bit for namenode only. > *setup* > NN - 64 bit > Secondary namenode (instance 1) - 64 bit > Secondary namenode (instance 2) - 32 bit > datanode - 32 bit > > From the mailing list I deduced that NN-64 bit and Datanode -32 bit combo > works > But, I am not sure if S-NN-(instance 1--- 64 bit ) and S-NN (instance 2 -- 32 > bit) will work with this setup. > > Also, do shud I be aware of any other issues for migrating over to 64 bit > namenode > > Thanks in advance for all the suggestions > > > -Sagar > >
