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From Ajay Garg <ajaygargn...@gmail.com>
Subject Re: Is replication possible with already existing data?
Date Sat, 24 Oct 2015 16:10:27 GMT
Ideas please, on what I may be doing wrong?

On Sat, Oct 24, 2015 at 5:48 PM, Ajay Garg <ajaygargnsit@gmail.com> wrote:

> Hi All.
>
> I have been doing extensive testing, and replication works fine, even if
> any permuatation of CAS11, CAS12, CAS21, CAS22 are downed and brought up.
> Syncing always takes place (obviously, as long as continuous-downtime-value
> does not exceed *max_hint_window_in_ms*).
>
>
> However, things behave weird when I try connecting via DataStax
> Java-Driver.
> I always add the nodes to the cluster in the order ::
>
>                          CAS11, CAS12, CAS21, CAS22
>
> during "cluster.connect" method.
>
>
> Now, following happens ::
>
> a)
> If CAS11 goes down, data is persisted fine (presumably first in CAS12, and
> later replicated to CAS21 and CAS22).
>
> b)
> If CAS11 and CAS12 go down, data is NOT persisted.
> Instead the following exceptions are observed in the Java-Driver ::
>
>
> ##################################################################################
> Exception in thread "main"
> com.datastax.driver.core.exceptions.NoHostAvailableException: All host(s)
> tried for query failed (no host was tried)
>     at
> com.datastax.driver.core.exceptions.NoHostAvailableException.copy(NoHostAvailableException.java:65)
>     at
> com.datastax.driver.core.DefaultResultSetFuture.extractCauseFromExecutionException(DefaultResultSetFuture.java:258)
>     at com.datastax.driver.core.Cluster.connect(Cluster.java:267)
>     at com.example.cassandra.SimpleClient.connect(SimpleClient.java:43)
>     at
> com.example.cassandra.SimpleClientTest.setUp(SimpleClientTest.java:50)
>     at
> com.example.cassandra.SimpleClientTest.main(SimpleClientTest.java:86)
> Caused by: com.datastax.driver.core.exceptions.NoHostAvailableException:
> All host(s) tried for query failed (no host was tried)
>     at
> com.datastax.driver.core.RequestHandler.sendRequest(RequestHandler.java:103)
>     at
> com.datastax.driver.core.SessionManager.execute(SessionManager.java:446)
>     at
> com.datastax.driver.core.SessionManager.executeQuery(SessionManager.java:482)
>     at
> com.datastax.driver.core.SessionManager.executeAsync(SessionManager.java:88)
>     at
> com.datastax.driver.core.AbstractSession.executeAsync(AbstractSession.java:60)
>     at com.datastax.driver.core.Cluster.connect(Cluster.java:260)
>     ... 3 more
>
> ###################################################################################
>
>
> I have already tried ::
>
> 1)
> Increasing driver-read-timeout from 12 seconds to 30 seconds.
>
> 2)
> Increasing driver-connect-timeout from 5 seconds to 30 seconds.
>
> 3)
> I have also confirmed that each of the 4 nodes are telnet-able over ports
> 9042 and 9160 each.
>
>
> Definitely seems to be some driver-issue, since
> data-persistence/replication works perfect (with any permutation) if
> data-persistence is done via "cqlsh".
>
>
> Kindly provide some pointers.
> Ultimately, it is the Java-driver that will be used in production, so it
> is imperative that data-persistence/replication happens for any downing of
> any permutation of node(s).
>
>
> Thanks and Regards,
> Ajay
>



-- 
Regards,
Ajay

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