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Date: Wed, 4 Jun 2014 08:48:38 +1000
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Subject: Re: problem removing dead node from ring
From: Matthew Allen <matthew.j.allen@gmail.com>
To: user@cassandra.apache.org
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Just out of curiosity, for a dead node, would it be possible to just

 - replace the node (no data in data/commit dirs), same IP Address, same
hostname.
 - restore the cassandra.yaml (initial_token etc)
 - set auto_bootstrap:false
 - start it up and then run a nodetool rebuild ?

Or would the Host ID value change with the new node ?

Thanks

Matt


On Wed, Jun 4, 2014 at 4:09 AM, Robert Coli <rcoli@eventbrite.com> wrote:

> On Tue, Jun 3, 2014 at 11:03 AM, Curious Patient <mongomaven@gmail.com>
> wrote:
>
>> In nodetool ring, if you're not using vnodes, only one token should be
>>> listed with both the IP of the old node and the status Down.
>>> If you are using vnodes, it's a comma delimited list in initial_token,
>>> which you can get from :
>>> nodetool info -T | grep Token | awk '{print $3}' | paste -s -d,
>>
>>
>> Oh, I'm seeing a lot of tokens for each node. So that means I am using
>> vnodes I guess? Really sorry I am just starting to try to really learn
>> cassandra. Still new at the game, however.
>>
>
> The default in current configs is to use 256 vnodes per physical node.
>
> I always recommend specifying the full list of tokens in use in the
> initial_token in the conf file, as a comma delimited list in the case of
> vnodes. It helps in an assortment of operational cases.
>
> Then, once that is done, wipe the data dirs again and use replace_address!
>
> =Rob
>
>

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<div dir=3D"ltr"><div><div><div><div>Just out of curiosity, for a dead node=
, would it be possible to just <br><br>=C2=A0- replace the node (no data in=
 data/commit dirs), same IP Address, same hostname.<br></div>=C2=A0- restor=
e the cassandra.yaml (initial_token etc)<br>
</div>=C2=A0- set auto_bootstrap:false<br></div>=C2=A0- start it up and the=
n run a nodetool rebuild ?<br><br></div>Or would the Host ID value change w=
ith the new node ?<br><br>Thanks<br><br>Matt<br></div><div class=3D"gmail_e=
xtra"><br>
<br><div class=3D"gmail_quote">On Wed, Jun 4, 2014 at 4:09 AM, Robert Coli =
<span dir=3D"ltr">&lt;<a href=3D"mailto:rcoli@eventbrite.com" target=3D"_bl=
ank">rcoli@eventbrite.com</a>&gt;</span> wrote:<br><blockquote class=3D"gma=
il_quote" style=3D"margin:0 0 0 .8ex;border-left:1px #ccc solid;padding-lef=
t:1ex">
<div dir=3D"ltr"><div class=3D"gmail_extra"><div class=3D"gmail_quote"><div=
 class=3D"">On Tue, Jun 3, 2014 at 11:03 AM, Curious Patient <span dir=3D"l=
tr">&lt;<a href=3D"mailto:mongomaven@gmail.com" target=3D"_blank">mongomave=
n@gmail.com</a>&gt;</span> wrote:<br>

<blockquote class=3D"gmail_quote" style=3D"margin:0 0 0 .8ex;border-left:1p=
x #ccc solid;padding-left:1ex"><div dir=3D"ltr"><div><blockquote style=3D"m=
argin:0px 0px 0px 0.8ex;border-left-width:1px;border-left-color:rgb(204,204=
,204);border-left-style:solid;padding-left:1ex" class=3D"gmail_quote">

In nodetool ring, if you&#39;re not using vnodes, only one token should be =
listed with both the IP of the old node and the status Down.<br>
If you are using vnodes, it&#39;s a comma delimited list in initial_token, =
which you can get from :<br style=3D"font-family:arial,sans-serif;font-size=
:13px"><span style=3D"font-family:arial,sans-serif;font-size:13px">nodetool=
 info -T | grep Token | awk &#39;{print $3}&#39; | paste -s -d,</span></blo=
ckquote>


<div><br></div></div><div>Oh, I&#39;m seeing a lot of tokens for each node.=
 So that means I am using vnodes I guess? Really sorry I am just starting t=
o try to really learn cassandra. Still new at the game, however.=C2=A0</div=
>

</div></blockquote><div><br></div></div><div>The default in current configs=
 is to use 256 vnodes per physical node.</div><div><br></div><div>I always =
recommend specifying the full list of tokens in use in the initial_token in=
 the conf file, as a comma delimited list in the case of vnodes. It helps i=
n an assortment of operational cases.</div>

<div><br></div><div>Then, once that is done, wipe the data dirs again and u=
se replace_address!</div><div><br></div><div>=3DRob</div><div><br></div></d=
iv></div></div>
</blockquote></div><br></div>

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