VIP acquisition in case of Network partition and remerge
<[email protected]> Fri, 17 Aug 2007 14:36:12 +0530
| Newsgroups | gmane.comp.apache.mod-wackamole.general |
|---|---|
| Message-ID | <[email protected]> |
This is a multi-part message in MIME format. --===============6195838400241958620== Content-class: urn:content-classes:message Content-Type: multipart/alternative; boundary="----_=_NextPart_001_01C7E0AD.D71F64F8" This is a multi-part message in MIME format. ------_=_NextPart_001_01C7E0AD.D71F64F8 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: quoted-printable Hi, =20 We tested wackamole using 3 nodes A,B and C =20 A single virtual IP is configured =20 Initially A acquired the VIP. We unplugged A from LAN(by pulling out the Network cable). Now B has acquired the VIP.When we tried to reach the VIP through putty via ssh. It got connected to B. Then we connected A back to the LAN.When A is connected back to the LAN, for some amount of time "wackatrl -l" in A shows that A is the master. "wackatrl -l" in B and C shows that B is the master. =20 In this scenario we got the following two different behaviours. =20 1. A comes to know that B has acquired the Virtual IP after sometime. A,B and C shows that B is the master. =20 2. A acquires the VIP after sometime. "wackatrl -l" in A,B and C shows that A is the master. =20 Can anyone throw some light on why there are 2 different behaviours for the same scenario. For some amount of time the virtual IP is covered by both A and B. On what basis the IP conflict will be resolved. =20 Also can someone explain in which order the state message will be sent/received when a view change message is sent by group communication system. Will the state messages be sent/handled independent of the other members in group or is there any dependency (i.e the state message will be sent by the second member in the process list maintained by group communication system after handling the state message from the first member) =20 Thanks, Mini. The information contained in this electronic message and any attachments to= this message are intended for the exclusive use of the addressee(s) and= may contain proprietary, confidential or privileged information. If you= are not the intended recipient, you should not disseminate, distribute or= copy this e-mail. Please notify the sender immediately and destroy all= copies of this message and any attachments.=20 WARNING: Computer viruses can be transmitted via email. The recipient= should check this email and any attachments for the presence of viruses.= The company accepts no liability for any damage caused by any virus= transmitted by this email. =20 www.wipro.com ------_=_NextPart_001_01C7E0AD.D71F64F8 Content-Type: text/html; charset="us-ascii" Content-Transfer-Encoding: quoted-printable <!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN"> <HTML><HEAD> <META http-equiv=3DContent-Type content=3D"text/html; charset=3Dus-ascii"> <META content=3D"MSHTML 6.00.2900.3132" name=3DGENERATOR></HEAD> <BODY> <DIV><FONT face=3DArial size=3D2><SPAN=20 class=3D881323108-17082007>Hi,</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2><SPAN=20 class=3D881323108-17082007></SPAN></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>We tested= wackamole=20 using 3 nodes A,B and C</SPAN></FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>A single= virtual IP=20 is configured</SPAN></FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>Initially= A acquired=20 the VIP. We unplugged A from LAN(by pulling out the Network cable). Now B= has=20 acquired the VIP.When we tried to reach the VIP through putty via= ssh. It=20 got connected to B.<BR></SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>Then we= connected A=20 back to the LAN.When A is connected back to the LAN, for some amount of= time=20 "wackatrl -l" in A shows that A is the master. "wackatrl -l" in B and C= shows=20 that B is the master.</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>In this= scenario we=20 got the following two different behaviours.</SPAN></FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>1. A= comes to know=20 that B has acquired the Virtual IP after sometime. A,B and C shows that B= is the=20 master.</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>2. A= acquires the=20 VIP after sometime. "wackatrl -l" in A,B and C shows that A is the=20 master.</SPAN></FONT></DIV> <DIV> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>Can= anyone throw=20 some light on why there are 2 different behaviours for the same scenario.= For=20 some amount of time the virtual IP is covered by both A and B. On what= basis the=20 IP conflict will be resolved.</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN class=3D881323108-17082007>Also can= someone=20 explain in which order the state message will be sent/received when a view= =20 change message is sent by group communication system. Will the state= messages be=20 sent/handled independent of the other members in group or is there any=20 dependency (i.e the state message will be sent by the second member in the= =20 process list maintained by group communication system after= handling=20 the state message from the first member)</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2></FONT> </DIV> <DIV><FONT face=3DArial size=3D2><SPAN=20 class=3D881323108-17082007>Thanks,</SPAN></FONT></DIV> <DIV><FONT face=3DArial size=3D2><SPAN=20 class=3D881323108-17082007>Mini.</SPAN></FONT></DIV></BODY></HTML> <table><tr><td bgcolor=3D#ffffff><font color=3D#000000><br> The information contained in this electronic message and any attachments to= this message are intended for the exclusive use of the addressee(s) and= may contain proprietary, confidential or privileged information. If you= are not the intended recipient, you should not disseminate, distribute or= copy this e-mail. Please notify the sender immediately and destroy all= copies of this message and any attachments. <br> <br> WARNING: Computer viruses can be transmitted via email. The recipient= should check this email and any attachments for the presence of viruses.= The company accepts no liability for any damage caused by any virus= transmitted by this email.<br> <br> www.wipro.com<br> </font></td></tr></table> ------_=_NextPart_001_01C7E0AD.D71F64F8-- --===============6195838400241958620== Content-Type: text/plain; charset="us-ascii" MIME-Version: 1.0 Content-Transfer-Encoding: 7bit Content-Disposition: inline _______________________________________________ wackamole-users mailing list [email protected] http://lists.backhand.org/mailman/listinfo/wackamole-users --===============6195838400241958620==--