pero 2005/04/24 02:45:52
Modified: modules/cluster to-do.txt
Log:
add my detected cluster problems when restarting applications or complete
nodes
Revision Changes Path
1.14 +43 -1 jakarta-tomcat-catalina/modules/cluster/to-do.txt
Index: to-do.txt
===================================================================
RCS file: /home/cvs/jakarta-tomcat-catalina/modules/cluster/to-do.txt,v
retrieving revision 1.13
retrieving revision 1.14
diff -u -r1.13 -r1.14
--- to-do.txt 22 Apr 2005 20:33:45 -0000 1.13
+++ to-do.txt 24 Apr 2005 09:45:52 -0000 1.14
@@ -64,7 +64,49 @@
via XML documents and http
- display stats as xml
- operation via JMX (MX4J adaptor)
-
+
+================
+problems
+================
+- How we can stop the request traffic when restart an application?
+ currently the jk 1.2.10 can only disable the complete loadbalancer,
+ but this detect only the new session request desicion.
+ Request with sessions marks send to tomcat.
+
+- Can't stop message replication for a spezial member and application
+ - this need a spezial cluster message and send filter at SimpleTcpCluster
+
+- Don't generate cluster message when no member is at cluster!
+ - Register DeltaManager as Cluster LifecycleListener and stop cresting
and sending
+ - Reduce memory consume when only one node is active
+
+- WaitForAck mode and resend probleme
+ - When session serialzisation needs more time then wait ack timeout,
+ the sender send GETALLSESSIONS again!!
+ Bad for performance and memory, sometimes it drop both nodes very
quickly!
+ => Some message need a flag that resend is not allowed!
+ proposed transfer protocol and api change between Transmitter/Senders
and ObjectReader/Receiver
+ not used byte[] instead a better transfer message format
+ header [TC] 2 bytes
+ type= <A-M> reserved 1 byte
+ compress = true/false 1 byte 1 true 0 false
+ resendAllowed = true/false 1 byte
+ isResendPackage = true/false 1 byte
+ splitpackage=true/false 1 byte
+ packagenumber= int 2 bytes
+ lastpackagenumber= int 2 bytes
+ length
4 bytes
+ orignalLength 4 bytes
+ byte[] length
+
+ orignalLength != length when compress = true, for better default
byte allocation at receiver)
+
+ see "Nice to have" also
+
+ - the resending is also a problem with FarmDeployer.
+ when last package received and starting the application needs time >
wait-ack timeout
+ => the last war file packge are resend
+
==============================
Nice to have:
==============================
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