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From: Apoorva Gaurav <apoorva.gaurav@myntra.com>
Date: Tue, 1 Apr 2014 16:20:30 +0530
Message-ID: 
 <CAJRvvD8BhpZ5Z9dGs12HLSrDzh_42MLF+zxT8CZrbjqvsczVtA@mail.gmail.com>
Subject: Dead node appearing in datastax driver
To: user <user@cassandra.apache.org>
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Hello All,

We had a 4 node cassandra 2.0.4 cluster  ( lets call them host1, host2,
host3 and host4), out of which we've removed one node (host4) using
nodetool removenode command. Now using nodetool status or nodetool ring we
no longer see host4. It's also not appearing in Datastax opscenter. But its
intermittently appearing in Metadata.getAllHosts() while connecting using
datastax driver 1.0.4.

Couple of questions :-
-How is it appearing.
-Can this have impact on read / write performance of client.

Code which we are using to connect is

     public void connect() {

        PoolingOptions poolingOptions = new PoolingOptions();

        cluster = Cluster.builder()

                .addContactPoints(inetAddresses.toArray(new String[]{}))

                .withLoadBalancingPolicy(new RoundRobinPolicy())

                .withPoolingOptions(poolingOptions)

                .withPort(port)

                .withCredentials(username, password)

                .build();

        Metadata metadata = cluster.getMetadata();

        System.out.printf("Connected to cluster: %s\n",
metadata.getClusterName());

        for (Host host : metadata.getAllHosts()) {

            System.out.printf("Datacenter: %s; Host: %s; Rack: %s\n",
host.getDatacenter(), host.getAddress(), host.getRack());

        }

    }


-- 
Thanks & Regards,
Apoorva

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<div dir=3D"ltr">Hello All,<div><br></div><div>We had a 4 node cassandra 2.=
0.4 cluster=A0=A0( lets call them host1, host2, host3 and host4), out of wh=
ich we&#39;ve removed=A0one node (host4)=A0using nodetool removenode comman=
d. Now using nodetool status or nodetool ring we no longer see host4. It=
9;s also not appearing in Datastax opscenter. But its intermittently appear=
ing in Metadata.getAllHosts() while connecting using datastax driver 1.0.4.=
=A0</div>

<div><br></div><div>Couple of questions :-</div><div>-How is it appearing.<=
/div><div>-Can this have impact on read / write performance of client.</div=
><div><br></div><div>Code which we are using to connect is</div><div><br>

</div><div>


<p class=3D"">=A0 =A0=A0<span class=3D"">public</span> <span class=3D"">voi=
d</span> connect() {</p>
<p class=3D"">=A0 =A0 =A0 =A0 PoolingOptions poolingOptions =3D <span class=
=3D"">new</span> PoolingOptions();</p>
<p class=3D"">=A0 =A0 =A0 =A0 <span class=3D"">cluster</span> =3D Cluster.b=
uilder()</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .addContactPoints(<span class=
=3D"">inetAddresses</span>.toArray(<span class=3D"">new</span> String[]{}))=
</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .withLoadBalancingPolicy(<spa=
n class=3D"">new</span> RoundRobinPolicy())</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .withPoolingOptions(poolingOp=
tions)</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .withPort(<span class=3D"">po=
rt</span>)</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .withCredentials(<span class=
=3D"">username</span>, <span class=3D"">password</span>)</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 =A0 =A0 .build();</p>
<p class=3D"">=A0 =A0 =A0 =A0 Metadata metadata =3D <span class=3D"">cluste=
r</span>.getMetadata();</p>
<p class=3D"">=A0 =A0 =A0 =A0 System.<span class=3D"">out</span>.printf(<sp=
an class=3D"">&quot;Connected to cluster: %s\n&quot;</span>, metadata.getCl=
usterName());</p>
<p class=3D"">=A0 =A0 =A0 =A0 <span class=3D"">for</span> (Host host : meta=
data.getAllHosts()) {</p>
<p class=3D"">=A0 =A0 =A0 =A0 =A0 =A0 System.<span class=3D"">out</span>.pr=
intf(<span class=3D"">&quot;Datacenter: %s; Host: %s; Rack: %s\n&quot;</spa=
n>, host.getDatacenter(), host.getAddress(), host.getRack());</p>
<p class=3D"">=A0 =A0 =A0 =A0 }</p>
<p class=3D"">=A0 =A0 }</p><p class=3D""><br></p><p class=3D""><br></p>-- <=
br>Thanks &amp; Regards,<br>Apoorva<br>
</div></div>

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