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Subject: Upgrade of the cluster. Data completion check
Date: Wed, 3 Aug 2011 17:13:43 +0100
Message-ID: <2E4C6C547282904987189BD44047AAFE487C73@NLDNC111PEX1.ubsw.net>
Thread-Topic: Upgrade of the cluster. Data completion check
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From: <Semyon.Chernyy@ubs.com>
To: <user@zookeeper.apache.org>
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Hello,

We have the project built on zookeeper-3.3.3 which starts the cluster,
just simple wrapper on zk lib.

Every version of the project has its own path to zookeeper's data/tx
folders. But all configs (number of nodes, client ports, etc) - the
same.

We release a new version and want to deploy it without stopping the
cluster.=20
Let's say we change from version A to B

We are executing:

1. stop node 1 of cluster (v. A)
2. start node 1 of cluster (v. B)
3. stop node 2 of cluster (v. A)
4. start node 2 of cluster (v. B)
And so on.

The data is automatically transferred to the data/tx directories of the
newly started nodes from the still running nodes of project version A.

The question is: is it possinble to check that the transfer of data
completed? Is it correct that it starts automatically?

Action 1, 2, 3, 4, ... can be automated but if they are executed too
fast I suppose it's possible to get the incompleted data on the nodes of
project's B.

Thank you
Semyon


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<TITLE>Upgrade of the cluster. Data completion check</TITLE>
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<P><FONT SIZE=3D2 FACE=3D"Arial">Hello,</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">We have the project built on =
zookeeper-3.3.3 which starts the cluster, just simple wrapper on zk =
lib.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Every version of the project has its =
own path to zookeeper's data/tx folders. But all configs (number of =
nodes, client ports, etc) - the same.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">We release a new version and want to =
deploy it without stopping the cluster. </FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Let&#8217;s say we change from version =
A to B</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">We are executing:</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">1. stop node 1 of cluster (v. A)</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">2. start node 1 of cluster (v. =
B)</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">3. stop node 2 of cluster (v. =
A)</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">4. start node 2 of cluster (v. =
B)</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">And so on.</FONT>
</P>

<P><FONT SIZE=3D2 FACE=3D"Arial">The data is automatically transferred =
to the data/tx directories of the newly started nodes from the still =
running nodes of project version A.</FONT></P>

<P><B><FONT SIZE=3D2 FACE=3D"Arial">The question is</FONT></B><FONT =
SIZE=3D2 FACE=3D"Arial">: is it possinble to check that the transfer of =
data completed? Is it correct that it starts automatically?</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Action 1, 2, 3, 4, ... can be automated =
but if they are executed too fast I suppose it's possible to get the =
incompleted data on the nodes of project's B.</FONT></P>

<P><FONT SIZE=3D2 FACE=3D"Arial">Thank you</FONT>

<BR><FONT SIZE=3D2 FACE=3D"Arial">Semyon</FONT>
</P>

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