Re: Tomcat simple tcp cluster doesn't work on switching browser
Hi, I tried to see if the connection between two tomcats is working correctly & took a netstat with the receiver port(4010) of tomcat 2 & process id(13437) of tomcat 1 which gives the following. netstat -anp | grep 4010 | grep 192.168.x.x:4010 | grep 13437/java tcp0580 :::192.168.x.x:41140 :::192.168.x.x:4010 ESTABLISHED 13437/java tcp0578 :::192.168.x.x:41136 :::192.168.x.x:4010 ESTABLISHED 13437/java netstat -anp | grep 4010 | grep 192.168.x.x:4010 | grep 13437/java tcp0580 :::192.168.x.x:41146 :::192.168.x.x:4010 ESTABLISHED 13437/java tcp0826 :::192.168.x.x:41151 :::192.168.x.x:4010 ESTABLISHED 13437/java netstat -anp | grep 4010 | grep 192.168.x.x:4010 | grep 13437/java tcp0757 :::192.168.x.x:41223 :::192.168.x.x:4010 ESTABLISHED 13437/java netstat -anp | grep 4010 | grep 192.168.x.x:4010 | grep 13437/java tcp0580 :::192.168.x.x:41292 :::192.168.x.x:4010 ESTABLISHED 13437/java tcp0757 :::192.168.x.x:41286 :::192.168.x.x:4010 ESTABLISHED 13437/java tcp0578 :::192.168.x.x:41282 :::192.168.x.x:4010 ESTABLISHED 13437/java tcp0 1 :::192.168.x.x:41293 :::192.168.x.x:4010 SYN_SENT13437/java netstat -anp | grep 4010 | grep 192.168.x.x:4010 | grep 13437/java I have two observations : a) The no of connections keeps changing form 0 to 4 . b) When this issue occurs , the Receive queue starts filling up Is observation 'a' normal behaviour? And are there ways to identify why the receive queue filling up ? On 17/11/15 3:06 pm, "Amit Rawat" wrote: >Hi Chris, > >It might seem that both are going to SERVER-1 because I have set the >jvmRoute for both instances of tomcat is set to SERVER-1. I had started >with setting different jvmRoute for both and I faced the same issue . Then >I tried setting them the same since I thought jvmRoute should be unique to >the server therefore I used server name . Although now I think they should >be unique to the tomcat instance. > >I am not using a load balancer. The two tomcats expose different services >& I need to share sessions between those services for a logged in user. >The scenario is that I login through tomcat 1, query it a few times, then >query tomcat 2 using the same session-id . > >My apologies if it seemed rude , but I pasted the link to my questions on >SO as I didn¹t want the mail to be too long & unreadable . Also, the post >on SO , has links to other SO suggestions that I have already tried. >Again, my apologies, it was not my intention to be either lazy or rude. > > >Thanks for the reply, >Amit > >On 17/11/15 3:28 am, "Christopher Schultz" >wrote: > >>Amit, >> >>On 11/16/15 7:21 AM, Amit Rawat wrote: >>> Thanks for the reply. I understand that on changing browsers, a new >>> session would need to be established & that is indeed what I do . On >>> changing browsers , I login again , creating a new session . >>> As can be seen in the logs I pasted on stack overflow : New Session ::: >>> 6003A09956987A2035EB9BB1C5D7C157.SERVER-1 . But as you can see from the >>> logs , the sessions created or destroyed are not shared with the other >>> tomcat by the tomcat to which I send my requests . >> >>It's not clear which Tomcat is receiving which requests... they all look >>like they are going to SERVER-1. Are you sure your lb is working as >>expected? >> >>While some of us lurk on SO, posting to this list and asking people to >>go to SO to answer your question is a little lazy (or perhaps rude). IF >>you want real advice, come here and give us all the information we need >>to help you. Then stick around and become part of the community. If you >>just want random advice from people on the internet, stick with SO. >> >>-chris >> >>> On 16/11/15 5:30 pm, "André Warnier (tomcat)" wrote: >>> >>>> On 16.11.2015 11:36, Amit Rawat wrote: >>>>> Hi, >>>>> >>>>> >>>>> >>>>> I'm observing some strange behaviour between two instances of >>>>> apache-tomcat-7.0.41 running on the same server. Sessions are shared >>>>> between the servers on multiple logins/logouts on the same browser , >>>>>but >>>>> when i switch browsers , the session sharing stops . >>>>> >>>>> I have posted a question on stack overflow where you can find more >>>>> details on what I have tried & my observations : >>>>> >>>>> >>>>> >>>>>http://stac
Re: Tomcat simple tcp cluster doesn't work on switching browser
Hi Chris, It might seem that both are going to SERVER-1 because I have set the jvmRoute for both instances of tomcat is set to SERVER-1. I had started with setting different jvmRoute for both and I faced the same issue . Then I tried setting them the same since I thought jvmRoute should be unique to the server therefore I used server name . Although now I think they should be unique to the tomcat instance. I am not using a load balancer. The two tomcats expose different services & I need to share sessions between those services for a logged in user. The scenario is that I login through tomcat 1, query it a few times, then query tomcat 2 using the same session-id . My apologies if it seemed rude , but I pasted the link to my questions on SO as I didn¹t want the mail to be too long & unreadable . Also, the post on SO , has links to other SO suggestions that I have already tried. Again, my apologies, it was not my intention to be either lazy or rude. Thanks for the reply, Amit On 17/11/15 3:28 am, "Christopher Schultz" wrote: >Amit, > >On 11/16/15 7:21 AM, Amit Rawat wrote: >> Thanks for the reply. I understand that on changing browsers, a new >> session would need to be established & that is indeed what I do . On >> changing browsers , I login again , creating a new session . >> As can be seen in the logs I pasted on stack overflow : New Session ::: >> 6003A09956987A2035EB9BB1C5D7C157.SERVER-1 . But as you can see from the >> logs , the sessions created or destroyed are not shared with the other >> tomcat by the tomcat to which I send my requests . > >It's not clear which Tomcat is receiving which requests... they all look >like they are going to SERVER-1. Are you sure your lb is working as >expected? > >While some of us lurk on SO, posting to this list and asking people to >go to SO to answer your question is a little lazy (or perhaps rude). IF >you want real advice, come here and give us all the information we need >to help you. Then stick around and become part of the community. If you >just want random advice from people on the internet, stick with SO. > >-chris > >> On 16/11/15 5:30 pm, "André Warnier (tomcat)" wrote: >> >>> On 16.11.2015 11:36, Amit Rawat wrote: >>>> Hi, >>>> >>>> >>>> >>>> I'm observing some strange behaviour between two instances of >>>> apache-tomcat-7.0.41 running on the same server. Sessions are shared >>>> between the servers on multiple logins/logouts on the same browser , >>>>but >>>> when i switch browsers , the session sharing stops . >>>> >>>> I have posted a question on stack overflow where you can find more >>>> details on what I have tried & my observations : >>>> >>>> >>>> >>>>http://stackoverflow.com/questions/33546555/tomcat-simple-tcp-cluster-d >>>>oe >>>> snt-work-on-switching-browser >>>> >>>> Any help would be appreciated. >>>> >>> >>> Off the top of my head, I would say >>> - a "session" saved on the server, is identified by a "session-id" >>>(some >>> kind of large >>> alphanumeric string, unique) >>> - to allow a browser to re-connect to the same session during several >>> interactions, this >>> session-id is initially sent to the browser, contained in a cookie >>> - whenever the browser interacts with the same server/cluster, it >>>resends >>> this cookie, and >>> this is what allows the server to re-connect this browser to the saved >>> session >>> >>> - of course, if you switch browsers, the new browser does not have that >>> cookie. So it does >>> not send it to the server/cluster, and it gets a new session, with a >>> different session-id. >>> >>> Or did I misunderstand your explanation of what happens ? >>> >>> >>> >>> >>> - >>> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >>> For additional commands, e-mail: users-h...@tomcat.apache.org >>> >> >> >> - >> To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >> For additional commands, e-mail: users-h...@tomcat.apache.org >> > >- >To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >For additional commands, e-mail: users-h...@tomcat.apache.org > - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Re: Tomcat simple tcp cluster doesn't work on switching browser
Hi André, Thanks for the reply. I understand that on changing browsers, a new session would need to be established & that is indeed what I do . On changing browsers , I login again , creating a new session . As can be seen in the logs I pasted on stack overflow : New Session ::: 6003A09956987A2035EB9BB1C5D7C157.SERVER-1 . But as you can see from the logs , the sessions created or destroyed are not shared with the other tomcat by the tomcat to which I send my requests . On 16/11/15 5:30 pm, "André Warnier (tomcat)" wrote: >On 16.11.2015 11:36, Amit Rawat wrote: >> Hi, >> >> >> >> I'm observing some strange behaviour between two instances of >>apache-tomcat-7.0.41 running on the same server. Sessions are shared >>between the servers on multiple logins/logouts on the same browser , but >>when i switch browsers , the session sharing stops . >> >> I have posted a question on stack overflow where you can find more >>details on what I have tried & my observations : >> >> >>http://stackoverflow.com/questions/33546555/tomcat-simple-tcp-cluster-doe >>snt-work-on-switching-browser >> >> Any help would be appreciated. >> > >Off the top of my head, I would say >- a "session" saved on the server, is identified by a "session-id" (some >kind of large >alphanumeric string, unique) >- to allow a browser to re-connect to the same session during several >interactions, this >session-id is initially sent to the browser, contained in a cookie >- whenever the browser interacts with the same server/cluster, it resends >this cookie, and >this is what allows the server to re-connect this browser to the saved >session > >- of course, if you switch browsers, the new browser does not have that >cookie. So it does >not send it to the server/cluster, and it gets a new session, with a >different session-id. > >Or did I misunderstand your explanation of what happens ? > > > > >- >To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org >For additional commands, e-mail: users-h...@tomcat.apache.org > - To unsubscribe, e-mail: users-unsubscr...@tomcat.apache.org For additional commands, e-mail: users-h...@tomcat.apache.org
Tomcat simple tcp cluster doesn't work on switching browser
Hi, I'm observing some strange behaviour between two instances of apache-tomcat-7.0.41 running on the same server. Sessions are shared between the servers on multiple logins/logouts on the same browser , but when i switch browsers , the session sharing stops . I have posted a question on stack overflow where you can find more details on what I have tried & my observations : http://stackoverflow.com/questions/33546555/tomcat-simple-tcp-cluster-doesnt-work-on-switching-browser Any help would be appreciated. Thanks , Amit.
