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Posted to user@cassandra.apache.org by Anishek Agarwal <an...@gmail.com> on 2015/11/16 11:20:43 UTC
handling down node cassandra 2.0.15
Hello,
We are having a 3 node cluster and one of the node went down due to a
hardware memory failure looks like. We followed the steps below after the
node was down for more than the default value of *max_hint_window_in_ms*
I tried to restart cassandra by following the steps @
1.
http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
2.
http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
*except the "clear data" part as it was not specified in second blog above.*
i was trying to restart the same node that went down, however I did not get
the messages in log files as stated in 2 against "StorageService"
instead it just tried to replay and then stopped with the error message as
below:
*ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584)
Exception encountered during startup*
*java.lang.RuntimeException: Cannot replace address with a node that is
already bootstrapped*
Can someone please help me if there is something i am doing wrong here.
Thanks for the help in advance.
Regards,
Anishek
Re: handling down node cassandra 2.0.15
Posted by Robert Coli <rc...@eventbrite.com>.
On Wed, Nov 18, 2015 at 6:16 AM, Anuj Wadehra <an...@yahoo.co.in>
wrote:
> Suppose, gc grace seconds=10days, max hinted handoff period=3 hrs, 3 nodes
> are there A,B & C,RF =3 and my client is reading at CL ONE. C remains down
> for 5 hours and misses many updates including those which happened after
> max hinted handoff period of 3 hrs. Now I bring back node C with
> auto_bootstrap false and run repair. If client queries at CL ONE and
> fetches a row which got updated after max hinted handoff period, there is a
> very high possibility of client returning stale data from node C . But as
> soon as node C has joined the ring, it will start participating in WRITEs.
>
> But if we follow the procedure you suggested, node C will come back, run
> repair but wont participate in reads till we join it to the cluster. During
> repair, if client queries at CL ONE and fetches a row which got updated
> after max hinted handoff period expired and was missed by node C, it will
> still get latest data from A and B. So, the integrity of data is not lost
> similar to the case when we auto_bootsrap with true. Additionally we save
> the unique data of node C. While repair is going on, node C will get all
> the Writes.
>
Yes, during this time, C is getting "extra" writes as it is repairing
itself vis a vis A and B, but it is not serving reads.
=Rob
Re: handling down node cassandra 2.0.15
Posted by Anuj Wadehra <an...@yahoo.co.in>.
Robert,
This is how I interpret the implications of the 3 steps you suggested.Please confirm my interpretation as this is really important.
Suppose, gc grace seconds=10days, max hinted handoff period=3 hrs, 3 nodes are there A,B & C,RF =3 and my client is reading at CL ONE. C remains down for 5 hours and misses many updates including those which happened after max hinted handoff period of 3 hrs. Now I bring back node C with auto_bootstrap false and run repair. If client queries at CL ONE and fetches a row which got updated after max hinted handoff period, there is a very high possibility of client returning stale data from node C . But as soon as node C has joined the ring, it will start participating in WRITEs.
But if we follow the procedure you suggested, node C will come back, run repair but wont participate in reads till we join it to the cluster. During repair, if client queries at CL ONE and fetches a row which got updated after max hinted handoff period expired and was missed by node C, it will still get latest data from A and B. So, the integrity of data is not lost similar to the case when we auto_bootsrap with true. Additionally we save the unique data of node C. While repair is going on, node C will get all the Writes.
@Anishek
Hinted handoffs are not related to gc grace seconds.
Thanks
Anuj
Sent from Yahoo Mail on Android
From:"Anishek Agarwal" <an...@gmail.com>
Date:Wed, 18 Nov, 2015 at 1:49 pm
Subject:Re: handling down node cassandra 2.0.15
@Rob interesting something i will try next time, for step 3 you mentioned -- I just remove the -Dcassandra.join_ring=false option and restart the cassandra service?
@Anuj, gc_grace_seconds dictates how long hinted handoff are stored right. These might be good where we explicitly delete values from the table. we just have ttl and DTCS should delete data older than 1 month. In this case do i need to wipe the node and then start copy of key space again ? or can i run a repair once it joins the right with auto_bootstrap=false.
On Wed, Nov 18, 2015 at 1:20 AM, Robert Coli <rc...@eventbrite.com> wrote:
On Tue, Nov 17, 2015 at 4:33 AM, Anuj Wadehra <an...@yahoo.co.in> wrote:
Only if gc_grace_seconds havent passed since the failure. If your machine is down for more than gc_grace_seconds you need to delete the data directory and go with auto bootstrap = true .
Since CASSANDRA-6961 you can :
1) bring up the node with join_ring=false
2) repair it
3) join it to the cluster
https://issues.apache.org/jira/browse/CASSANDRA-6961
This prevents you from decreasing your unique replica count, which is usually a good thing!
=Rob
Re: handling down node cassandra 2.0.15
Posted by Anishek Agarwal <an...@gmail.com>.
@Rob interesting something i will try next time, for step 3 you mentioned
-- I just remove the -Dcassandra.join_ring=false option and restart the
cassandra service?
@Anuj, gc_grace_seconds dictates how long hinted handoff are stored right.
These might be good where we explicitly delete values from the table. we
just have ttl and DTCS should delete data older than 1 month. In this case
do i need to wipe the node and then start copy of key space again ? or can
i run a repair once it joins the right with auto_bootstrap=false.
On Wed, Nov 18, 2015 at 1:20 AM, Robert Coli <rc...@eventbrite.com> wrote:
> On Tue, Nov 17, 2015 at 4:33 AM, Anuj Wadehra <an...@yahoo.co.in>
> wrote:
>
>> Only if gc_grace_seconds havent passed since the failure. If your machine
>> is down for more than gc_grace_seconds you need to delete the data
>> directory and go with auto bootstrap = true .
>>
>
> Since CASSANDRA-6961 you can :
>
> 1) bring up the node with join_ring=false
> 2) repair it
> 3) join it to the cluster
>
> https://issues.apache.org/jira/browse/CASSANDRA-6961
>
> This prevents you from decreasing your unique replica count, which is
> usually a good thing!
>
> =Rob
>
Re: handling down node cassandra 2.0.15
Posted by Robert Coli <rc...@eventbrite.com>.
On Tue, Nov 17, 2015 at 4:33 AM, Anuj Wadehra <an...@yahoo.co.in>
wrote:
> Only if gc_grace_seconds havent passed since the failure. If your machine
> is down for more than gc_grace_seconds you need to delete the data
> directory and go with auto bootstrap = true .
>
Since CASSANDRA-6961 you can :
1) bring up the node with join_ring=false
2) repair it
3) join it to the cluster
https://issues.apache.org/jira/browse/CASSANDRA-6961
This prevents you from decreasing your unique replica count, which is
usually a good thing!
=Rob
Re: handling down node cassandra 2.0.15
Posted by Anuj Wadehra <an...@yahoo.co.in>.
Only if gc_grace_seconds havent passed since the failure. If your machine is down for more than gc_grace_seconds you need to delete the data directory and go with auto bootstrap = true .
Thanks
Anuj
Sent from Yahoo Mail on Android
From:"Anishek Agarwal" <an...@gmail.com>
Date:Tue, 17 Nov, 2015 at 10:52 am
Subject:Re: handling down node cassandra 2.0.15
hey Anuj,
Ok I will try that next time, so you are saying since i am replacing the machine in place(trying to get the same machine back in cluster) which already has some data, I dont clean the commitlogs/data directories and set auto_bootstrap = false and then restart the node, followed by repair on this machine right ?
thanks
anishek
On Mon, Nov 16, 2015 at 11:40 PM, Anuj Wadehra <an...@yahoo.co.in> wrote:
Hi Abhishek,
In my opinion, you already have data and bootstrapping is not needed here. You can set auto_bootstrap to false in Cassandra.yaml and once the cassandra is rebooted, you should run repair to fix the inconsistent data.
Thanks
Anuj
On Monday, 16 November 2015 10:34 PM, Josh Smith <jo...@careerbuilder.com> wrote:
Sis you set the JVM_OPTS to replace address? That is usually the error I get when I forget to set the replace_address on Cassandra-env.
JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node
From: Anishek Agarwal [mailto:anishek@gmail.com]
Sent: Monday, November 16, 2015 9:25 AM
To: user@cassandra.apache.org
Subject: Re: handling down node cassandra 2.0.15
nope its not
On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <ps...@gmail.com> wrote:
Is that a seed node?
On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
Hello,
We are having a 3 node cluster and one of the node went down due to a hardware memory failure looks like. We followed the steps below after the node was down for more than the default value of max_hint_window_in_ms
I tried to restart cassandra by following the steps @
http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
except the "clear data" part as it was not specified in second blog above.
i was trying to restart the same node that went down, however I did not get the messages in log files as stated in 2 against "StorageService"
instead it just tried to replay and then stopped with the error message as below:
ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584) Exception encountered during startup
java.lang.RuntimeException: Cannot replace address with a node that is already bootstrapped
Can someone please help me if there is something i am doing wrong here.
Thanks for the help in advance.
Regards,
Anishek
Re: handling down node cassandra 2.0.15
Posted by Anishek Agarwal <an...@gmail.com>.
hey Anuj,
Ok I will try that next time, so you are saying since i am replacing the
machine in place(trying to get the same machine back in cluster) which
already has some data, I dont clean the commitlogs/data directories and set
auto_bootstrap = false and then restart the node, followed by repair on
this machine right ?
thanks
anishek
On Mon, Nov 16, 2015 at 11:40 PM, Anuj Wadehra <an...@yahoo.co.in>
wrote:
> Hi Abhishek,
>
> In my opinion, you already have data and bootstrapping is not needed here.
> You can set auto_bootstrap to false in Cassandra.yaml and once the
> cassandra is rebooted, you should run repair to fix the inconsistent data.
>
>
> Thanks
> Anuj
>
>
>
> On Monday, 16 November 2015 10:34 PM, Josh Smith <
> josh.smith@careerbuilder.com> wrote:
>
>
> Sis you set the JVM_OPTS to replace address? That is usually the error I
> get when I forget to set the replace_address on Cassandra-env.
>
> JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node
>
>
> *From:* Anishek Agarwal [mailto:anishek@gmail.com]
> *Sent:* Monday, November 16, 2015 9:25 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: handling down node cassandra 2.0.15
>
> nope its not
>
> On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <
> pskraju88@gmail.com> wrote:
>
> Is that a seed node?
>
> On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
>
> Hello,
>
> We are having a 3 node cluster and one of the node went down due to a
> hardware memory failure looks like. We followed the steps below after the
> node was down for more than the default value of *max_hint_window_in_ms*
>
> I tried to restart cassandra by following the steps @
>
>
> 1.
> http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
> 2.
> http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
>
> *except the "clear data" part as it was not specified in second blog
> above.*
>
> i was trying to restart the same node that went down, however I did not
> get the messages in log files as stated in 2 against "StorageService"
>
> instead it just tried to replay and then stopped with the error message as
> below:
>
> *ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584)
> Exception encountered during startup*
> *java.lang.RuntimeException: Cannot replace address with a node that is
> already bootstrapped*
>
> Can someone please help me if there is something i am doing wrong here.
>
> Thanks for the help in advance.
>
> Regards,
> Anishek
>
>
>
>
>
Re: handling down node cassandra 2.0.15
Posted by Anuj Wadehra <an...@yahoo.co.in>.
Sis you set the JVM_OPTS to replace address? That is usually the error I get when I forget to set the replace_address on Cassandra-env.
JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node
From: Anishek Agarwal [mailto:anishek@gmail.com]
Sent: Monday, November 16, 2015 9:25 AM
To: user@cassandra.apache.org
Subject: Re: handling down node cassandra 2.0.15
nope its not
On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <ps...@gmail.com> wrote:
Is that a seed node?
On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
Hello,
We are having a 3 node cluster and one of the node went down due to a hardware memory failure looks like. We followed the steps below after the node was down for more than the default value of max_hint_window_in_ms
I tried to restart cassandra by following the steps @
http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
except the "clear data" part as it was not specified in second blog above.
i was trying to restart the same node that went down, however I did not get the messages in log files as stated in 2 against "StorageService"
instead it just tried to replay and then stopped with the error message as below:
ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584) Exception encountered during startup
java.lang.RuntimeException: Cannot replace address with a node that is already bootstrapped
Can someone please help me if there is something i am doing wrong here.
Thanks for the help in advance.
Regards,
Anishek
Re: handling down node cassandra 2.0.15
Posted by Anuj Wadehra <an...@yahoo.co.in>.
Hi Abhishek,
In my opinion, you already have data and bootstrapping is not needed here. You can set auto_bootstrap to false in Cassandra.yaml and once the cassandra is rebooted, you should run repair to fix the inconsistent data.
ThanksAnuj
On Monday, 16 November 2015 10:34 PM, Josh Smith <jo...@careerbuilder.com> wrote:
#yiv1301064707 -- filtered {font-family:Helvetica;panose-1:2 11 6 4 2 2 2 2 2 4;}#yiv1301064707 filtered {panose-1:2 4 5 3 5 4 6 3 2 4;}#yiv1301064707 filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}#yiv1301064707 filtered {font-family:Consolas;panose-1:2 11 6 9 2 2 4 3 2 4;}#yiv1301064707 p.yiv1301064707MsoNormal, #yiv1301064707 li.yiv1301064707MsoNormal, #yiv1301064707 div.yiv1301064707MsoNormal {margin:0in;margin-bottom:.0001pt;font-size:12.0pt;}#yiv1301064707 a:link, #yiv1301064707 span.yiv1301064707MsoHyperlink {color:blue;text-decoration:underline;}#yiv1301064707 a:visited, #yiv1301064707 span.yiv1301064707MsoHyperlinkFollowed {color:purple;text-decoration:underline;}#yiv1301064707 p {margin-right:0in;margin-left:0in;font-size:12.0pt;}#yiv1301064707 pre {margin:0in;margin-bottom:.0001pt;font-size:10.0pt;}#yiv1301064707 span.yiv1301064707EmailStyle18 {color:#1F497D;}#yiv1301064707 span.yiv1301064707HTMLPreformattedChar {}#yiv1301064707 .yiv1301064707MsoChpDefault {}#yiv1301064707 filtered {margin:1.0in 1.0in 1.0in 1.0in;}#yiv1301064707 div.yiv1301064707WordSection1 {}#yiv1301064707 filtered {}#yiv1301064707 ol {margin-bottom:0in;}#yiv1301064707 ul {margin-bottom:0in;}#yiv1301064707 Sis you set the JVM_OPTS to replace address? That is usually the error I get when I forget to set the replace_address on Cassandra-env. JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node From: Anishek Agarwal [mailto:anishek@gmail.com]
Sent: Monday, November 16, 2015 9:25 AM
To: user@cassandra.apache.org
Subject: Re: handling down node cassandra 2.0.15 nope its not On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <ps...@gmail.com> wrote:
Is that a seed node? On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
Hello, We are having a 3 node cluster and one of the node went down due to a hardware memory failure looks like. We followed the steps below after the node was down for more than the default value of max_hint_window_in_ms I tried to restart cassandra by following the steps @
- http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
- http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
except the "clear data" part as it was not specified in second blog above. i was trying to restart the same node that went down, however I did not get the messages in log files as stated in 2 against "StorageService" instead it just tried to replay and then stopped with the error message as below: ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584) Exception encountered during startup java.lang.RuntimeException: Cannot replace address with a node that is already bootstrapped Can someone please help me if there is something i am doing wrong here. Thanks for the help in advance. Regards, Anishek
Re: handling down node cassandra 2.0.15
Posted by Anishek Agarwal <an...@gmail.com>.
Hey Josh
I did set the replace address which was same as the address of the machine
which went down so it was in place.
anishek
On Mon, Nov 16, 2015 at 10:33 PM, Josh Smith <jo...@careerbuilder.com>
wrote:
> Sis you set the JVM_OPTS to replace address? That is usually the error I
> get when I forget to set the replace_address on Cassandra-env.
>
>
>
> JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node
>
>
>
>
>
> *From:* Anishek Agarwal [mailto:anishek@gmail.com]
> *Sent:* Monday, November 16, 2015 9:25 AM
> *To:* user@cassandra.apache.org
> *Subject:* Re: handling down node cassandra 2.0.15
>
>
>
> nope its not
>
>
>
> On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <
> pskraju88@gmail.com> wrote:
>
> Is that a seed node?
>
>
>
> On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
>
> Hello,
>
>
>
> We are having a 3 node cluster and one of the node went down due to a
> hardware memory failure looks like. We followed the steps below after the
> node was down for more than the default value of *max_hint_window_in_ms*
>
>
>
> I tried to restart cassandra by following the steps @
>
>
>
> 1.
> http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
> 2.
> http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
>
> *except the "clear data" part as it was not specified in second blog
> above.*
>
>
>
> i was trying to restart the same node that went down, however I did not
> get the messages in log files as stated in 2 against "StorageService"
>
>
>
> instead it just tried to replay and then stopped with the error message as
> below:
>
>
>
> *ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584)
> Exception encountered during startup*
>
> *java.lang.RuntimeException: Cannot replace address with a node that is
> already bootstrapped*
>
>
>
> Can someone please help me if there is something i am doing wrong here.
>
>
>
> Thanks for the help in advance.
>
>
>
> Regards,
>
> Anishek
>
>
>
RE: handling down node cassandra 2.0.15
Posted by Josh Smith <jo...@careerbuilder.com>.
Sis you set the JVM_OPTS to replace address? That is usually the error I get when I forget to set the replace_address on Cassandra-env.
JVM_OPTS="$JVM_OPTS -Dcassandra.replace_address=address_of_dead_node
From: Anishek Agarwal [mailto:anishek@gmail.com]
Sent: Monday, November 16, 2015 9:25 AM
To: user@cassandra.apache.org
Subject: Re: handling down node cassandra 2.0.15
nope its not
On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <ps...@gmail.com>> wrote:
Is that a seed node?
On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com>> wrote:
Hello,
We are having a 3 node cluster and one of the node went down due to a hardware memory failure looks like. We followed the steps below after the node was down for more than the default value of max_hint_window_in_ms
I tried to restart cassandra by following the steps @
1. http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
2. http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
except the "clear data" part as it was not specified in second blog above.
i was trying to restart the same node that went down, however I did not get the messages in log files as stated in 2 against "StorageService"
instead it just tried to replay and then stopped with the error message as below:
ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584) Exception encountered during startup
java.lang.RuntimeException: Cannot replace address with a node that is already bootstrapped
Can someone please help me if there is something i am doing wrong here.
Thanks for the help in advance.
Regards,
Anishek
Re: handling down node cassandra 2.0.15
Posted by Anishek Agarwal <an...@gmail.com>.
nope its not
On Mon, Nov 16, 2015 at 5:48 PM, sai krishnam raju potturi <
pskraju88@gmail.com> wrote:
> Is that a seed node?
>
> On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
>
>> Hello,
>>
>> We are having a 3 node cluster and one of the node went down due to a
>> hardware memory failure looks like. We followed the steps below after the
>> node was down for more than the default value of *max_hint_window_in_ms*
>>
>> I tried to restart cassandra by following the steps @
>>
>>
>> 1.
>> http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
>> 2.
>> http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
>>
>> *except the "clear data" part as it was not specified in second blog
>> above.*
>>
>> i was trying to restart the same node that went down, however I did not
>> get the messages in log files as stated in 2 against "StorageService"
>>
>> instead it just tried to replay and then stopped with the error message
>> as below:
>>
>> *ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584)
>> Exception encountered during startup*
>> *java.lang.RuntimeException: Cannot replace address with a node that is
>> already bootstrapped*
>>
>> Can someone please help me if there is something i am doing wrong here.
>>
>> Thanks for the help in advance.
>>
>> Regards,
>> Anishek
>>
>
Re: handling down node cassandra 2.0.15
Posted by sai krishnam raju potturi <ps...@gmail.com>.
Is that a seed node?
On Mon, Nov 16, 2015, 05:21 Anishek Agarwal <an...@gmail.com> wrote:
> Hello,
>
> We are having a 3 node cluster and one of the node went down due to a
> hardware memory failure looks like. We followed the steps below after the
> node was down for more than the default value of *max_hint_window_in_ms*
>
> I tried to restart cassandra by following the steps @
>
>
> 1.
> http://docs.datastax.com/en/cassandra/1.2/cassandra/operations/ops_replace_node_t.html
> 2.
> http://blog.alteroot.org/articles/2014-03-12/replace-a-dead-node-in-cassandra.html
>
> *except the "clear data" part as it was not specified in second blog
> above.*
>
> i was trying to restart the same node that went down, however I did not
> get the messages in log files as stated in 2 against "StorageService"
>
> instead it just tried to replay and then stopped with the error message as
> below:
>
> *ERROR [main] 2015-11-16 15:27:22,944 CassandraDaemon.java (line 584)
> Exception encountered during startup*
> *java.lang.RuntimeException: Cannot replace address with a node that is
> already bootstrapped*
>
> Can someone please help me if there is something i am doing wrong here.
>
> Thanks for the help in advance.
>
> Regards,
> Anishek
>