Remote management system with adaptive session management mechanism

• US 8,938,495 B2
• Filed: 03/12/2013
• Issued: 01/20/2015
• Est. Priority Date: 11/01/2012
• Status: Active Grant

• Current Assignee: Industrial Technology Research Institute
• Original Assignee: Industrial Technology Research Institute
• Inventors: Wu, Jin-Neng, Chen, Ping-Yu, Chao, Yu-Chang, Lee, Kuen-Min
• Primary Examiner(s): Hussain, Tauqir
• Application Number:
  US13/796,235
• Publication Number:
  US 20140122574A1
• Time in Patent Office: 679 Days
• Field of Search: 709/203
• US Class Current: 709/203
• CPC Class Codes: H04L 67/01 Protocols
• CPC Class Codes: H04L 67/1001 for accessing one among a plurality of replicated servers

Abstract

A remote management system with adaptive management mechanism is disclosed, by using an adaptive feedback session management decision (AFSMD) server to connect a plurality of clients and a plurality of cluster nodes respectively. AFSMD server includes a session ID map manager for recording mapping between session and cluster node forwarded to; a decision grade producer, for producing a decision grade to determine the session management manner required for the current session; a session connection number query (SCNQ) for communicating with a storage to obtain a total connection number of a client; a cluster node communication interface, for communicating with cluster nodes and for information cluster nodes if session needs duplication; and a session management decision controller for overseeing the entire session management decision flow to achieve higher efficiency.

Claims

1. A remote management system with adaptive session management mechanism, comprising:

at least a client terminal;

at least a cluster node; and

an adaptive feedback session management decision (AFSMD) server, connected to the at least a client terminal and the at least one cluster node;

the AFSMD server further comprising;

a session identification (ID) map manager, configured to record a mapping relation between sessions and the cluster nodes forwarded to;

a decision grade producer, configured to produce a decision grade to determine a session management manner of a current session;

a session connection number query (SCNQ), configured to communicate with a storage device and obtain a number of session connections of a client terminal;

a cluster node communication interface, configured to detect whether all cluster nodes are operating normally, communicate with the cluster nodes, forward a connection from the client terminal to a cluster node based on a load-balancing rule and obtain a session ID, and inform the cluster nodes whether to replicate content of the current session; and

a session management decision controller, connected to the session ID mapping manager, session decision grade producer, SCNQ and cluster node communication interface, configured to control entire the decision flow of the session management, including an adaptive session management decision algorithm to dynamically determine a different session management manner according to a decision grade produced by the decision grade producer, and to record a number of successes and failures of each cluster node for modifying a decision grade factor.

2. The remote management system with adaptive session management mechanism as claimed in claim 1, wherein the session management decision controller controls the session ID mapping manager to obtain and record the session ID;

the session management decision controller controls the decision grade producer to compute a replication decision grade RG, a random value R, a change ratio CR and a replication change ratio RCR;

the session management decision controller controls the SCNQ to obtain a session connection number N and update a failure ration; and

the session management decision controller controls the cluster node communication interface to obtain whether the cluster node is in a normal state and forward a connection with a replication flag to a suitable cluster node.

3. The remote management system with adaptive session management mechanism as claimed in claim 2, wherein the SCNQ further comprises a database configured to store the session connection number of each client terminal for storing information including a total connection number expected in next session of each client terminal.

4. The remote management system with adaptive session management mechanism as claimed in claim 2, wherein the SCNQ further uses a proxy to connect to a database configured to store the session connection number of each client terminal for storing information including a total connection number expected in next session of each client terminal.

5. A method of adaptive session management, executable on an adaptive feedback session management decision (AFSMD) server, applicable to a session-based service system, the session-based service system comprising at least a client terminal and at least a cluster node, the method of adaptive session management comprising the following steps:

assigning an initial value to a failure factor of a cluster node;

the system receiving a connection request from a client terminal and inspecting whether the connection request including a session ID data;

determining a management manner for the session connection based on a pre-session session management decision algorithm before the session when no session ID data being included;

executing an in-session session management decision algorithm to determine a management manner for subsequent session connections when session ID data being included;

based on mapping session management manner in a session ID mapping manager, forwarding the connection request to a corresponding cluster node for processing; and

updating failure ratio and failure factor of the cluster node, and continuing to receive a next connection request until all connection requests being over;

wherein the at least a client terminal using the decision apparatus of adaptive feedback session management indirectly to establish connection with the at least one cluster node;

the decision apparatus of adaptive feedback session management being configured to distributing connection request from the at least a client terminal to the at least one cluster node, and returning the execution result from the at least one cluster node to the at least a client terminal for performing session management.

6. The method of adaptive session management as claimed in claim 5, wherein the step to determine a management manner for the session connection based on a pre-session session management decision algorithm before the session further comprises the following steps:

obtaining a total connection number N;

generating a replication decision grade RG based on the total connection number N and the cluster node failure factor F_CNC, and randomly generating a random value R between 0 and 1;

determining whether R is less than the replication decision grade RG;

when R<

RG, setting a replication flag RF as false and recording mapping between the session ID and the cluster node;

when R≧

RG, setting a replication flag RF as true; and

updating session ID mapping.

7. The method of adaptive session management as claimed in claim 5, wherein the step to forward the connection request to corresponding cluster node for processing based on mapping session management manner in a session ID mapping manager further comprises the following steps:

determining whether the replication flag of the session ID being true;

when the replication flag of the session ID being true, generating a change ratio CR and generating a replication change ration RCR between 0 and 1;

when the replication flag of the session ID being false, terminating the present process;

determining whether CR<

RCR;

when CR<

RCR, setting the replication flag as false;

when CR≧

RCR, terminating the present process; and

deleting replicated session on the other cluster nodes, recording mapping of the session ID and the cluster node and updating session ID mapping, and recording the mapping of the session ID and cluster node.

8. The method of adaptive session management as claimed in claim 5, wherein the session ID is a unique ID established for each session.

9. The method of adaptive session management as claimed in claim 5, wherein a session ID mapping manager is configured to record mapping between a session and a cluster node being forwarded to.

10. The method of adaptive session management as claimed in claim 5, wherein the failure ratio is a ratio between a total number of failures and a total connection number.

11. The method of adaptive session management as claimed in claim 6, wherein the replication decision grade is reversely proportional to the cluster node failure factor F_CNC and proportional to square of the total connection number N.

12. The method of adaptive session management as claimed in claim 7, wherein the CR value is proportional to the F_CNC and has a mean distribution mapping relation with the total connection number N.

13. The method of adaptive session management as claimed in claim 6, wherein a true replication flag indicates that the session is replicated to other cluster nodes, and a false replication flag indicates that the session is not replicated to other cluster nodes.

14. A adaptive feedback session management decision (AFSMD) apparatus, able to connect to at least a client terminal and at least a cluster node, the AFSMD apparatus comprising:

a session identification (ID) map manager, configured to record a mapping relation between sessions and the cluster nodes forwarded to;

a decision grade producer, configured to produce a decision grade to determine a session management manner of a current session;

a session connection number query (SCNQ), configured to communicate with a storage device and obtain a number of session connections of a client terminal;

a cluster node communication interface, configured to detect whether all cluster nodes operating normally, communicate with cluster nodes, forward a connection from a client terminal to a cluster node based on a load-balancing rule and obtain a session ID, and inform cluster nodes whether to replicate content of the current session; and

a session management decision controller, connected to the session ID mapping manager, session decision grade producer, SCNQ and cluster node communication interface, configured to control entire decision flow of the session management, including an adaptive session management decision algorithm to dynamically determine different session management manner according to a decision grade produced by the decision grade producer, and to record the number of successes and failures of each cluster nodes for modifying a decision grade factor.

15. The AFSMD apparatus as claimed in claim 14, wherein the session management decision controller controls the session ID mapping manager to obtain and record the session ID;

the session management decision controller controls the decision grade producer to compute a replication decision grade RG, a random value R, a change ratio CR and a replication change ratio RCR;

the session management decision controller controls the SCNQ to obtain a session connection number N and update a failure ratio; and

the session management decision controller controls the cluster node communication interface to obtain whether the cluster node is in a normal state and forward a connection with a replication flag to a suitable cluster node.

16. The AFSMD apparatus as claimed in claim 15, wherein the SCNQ further comprises a database configured to store the session connection number of each client terminal for storing information including a total connection number expected in next session of each client terminal.

17. The AFSMD apparatus as claimed in claim 15, wherein the SCNQ further uses a proxy to connect to a database configured to store the session connection number of each client terminal for storing information including a total connection number expected in next session of each client terminal.

18. A method of adaptive session management, executable on an adaptive feedback session management decision (AFSMD) apparatus, the AFSMD apparatus being connected to at least a client terminal and at least a cluster node, the method of adaptive session management comprising the following steps:

assigning an initial value to a failure factor of a cluster node;

the system receiving a connection request from a client terminal and inspecting whether the connection request including a session ID data;

determining a management manner for the session connection based on a pre-session session management decision algorithm before the session when no session ID data being included;

executing an in-session session management decision algorithm to determine a management manner for subsequent session connections when session ID data being included;

based on mapping session management manner in a session ID mapping manager, forwarding the connection request to corresponding cluster node for processing; and

updating failure ratio and failure factor of the cluster node, and continuing to receive a next connection request until all connection requests being over;

wherein the at least a client terminal using the decision apparatus of adaptive feedback session management indirectly to establish connection with the at least one cluster node;

the decision apparatus of adaptive feedback session management being configured to distributing connection request from the at least a client terminal to the at least one cluster node, and returning the execution result from the at least one cluster node to the at least a client terminal for performing session management.

19. The method of adaptive session management as claimed in claim 18, wherein the step to determine a management manner for the session connection based on a pre-session session management decision algorithm before the session further comprises the following steps:

obtaining a total connection number N;

generating a replication decision grade RG based on total the connection number N and the cluster node failure factor F_CNC, and randomly generating a random value R between 0 and 1;

determining whether R is less than the replication decision grade RG;

when R<

RG, setting a replication flag RF as false and recording mapping between the session ID and the cluster node;

when R≧

RG, setting a replication flag RF as true; and

updating session ID mapping.

20. The method of adaptive session management as claimed in claim 18, wherein the step to forward the connection request to corresponding cluster node for processing based on mapping session management manner in a session ID mapping manager further comprises the following steps:

determining whether the replication flag of the session ID being true;

when the replication flag of the session ID being true, generating a change ratio CR and generating a replication change ration RCR between 0 and 1;

when the replication flag of the session ID being false, terminating the present process;

determining whether CR<

RCR;

when CR<

RCR, setting the replication flag as false;

when CR≧

RCR, terminating the present process; and

deleting replicated session on the other cluster nodes, recording mapping of the session ID and the cluster node and updating session ID mapping, and recording the mapping of the session ID and cluster node.

21. The method of adaptive session management as claimed in claim 18, wherein the session ID is a unique ID established for each session.

22. The method of adaptive session management as claimed in claim 18, wherein a session ID mapping manager is configured to record mapping between a session and a cluster node being forwarded to.

23. The method of adaptive session management as claimed in claim 18, wherein the failure ratio is a ratio between a total number of failures and a total connection number.

24. The method of adaptive session management as claimed in claim 19, wherein the replication decision grade is reversely proportional to the cluster node failure factor F_CNC and proportional to square of the total connection number N.

25. The method of adaptive session management as claimed in claim 20, wherein the CR value is proportional to the F_CNC and has a mean distribution mapping relation with the total connection number N.

26. The method of adaptive session management as claimed in claim 19, wherein a true replication flag indicates that the session is replicated to other cluster node, and a false replication flag indicates that the session is not replicated to other cluster node.