Method and device for file transfer protocol deadlock detection and self recovery

• US 20120240119A1
• Filed: 05/25/2010
• Published: 09/20/2012
• Est. Priority Date: 12/07/2009
• Status: Active Grant

• Current Assignee: ZTE Corporation
• Original Assignee: ZTE Corporation
• Inventors: Xie, Xingfeng, Liu, Sujian, Chen, Hua, Zhu, Ping
• Granted Patent: US 9,009,710 B2
• Time in Patent Office: Days
• US Class Current: 718/100
• CPC Class Codes: G06F 11/07 Responding to the occurrence of a fault, e.g. fault tolerance
• CPC Class Codes: H04L 43/00 Arrangements for monitoring or testing data switching networks
• CPC Class Codes: H04L 43/08 Monitoring or testing based on specific metrics, e.g. QoS, energy consumption or environmental parameters
• CPC Class Codes: H04L 43/0811 by checking connectivity
• CPC Class Codes: H04L 65/1066 Session management
• CPC Class Codes: H04L 67/00 Network arrangements or protocols for supporting network services or applications user-to-user messaging H04L51/00; network arrangements, protocols or services for supporting real-time applications in data packet communications networks H04L65/00
• CPC Class Codes: H04L 67/06 specially adapted for file transfer, e.g. file transfer protocol [FTP]
• CPC Class Codes: H04L 69/40 for recovering from a failure of a protocol instance or entity, e.g. service redundancy protocols, protocol state redundancy or protocol service redirection management of faults, events, alarms or notifications in data switching networks H04L41/06

Abstract

A method and a device for file transfer protocol (FTP) deadlock detection and self recovery are provided by the disclosure in order to solve the sudden deadlock problem in the FTP upload operation. The method includes: if a daemon determines that a deadlock occurs in an FTP upload task by a heartbeat detection mechanism, the socket resources used by the FTP upload operation is recorded at the storage location in a socket resource cycle queue, and an FTP upload task end process is started; determining whether the socket resource cycle queue is full, if it is not full, the socket resource information occupied by the current deadlock is put into the socket resource cycle queue, otherwise, the earliest socket resources in the socket resource cycle queue are released, and the socket resource information occupied by the current deadlock is put into the socket resource cycle queue.

Claims

1. A method for File Transfer Protocol (FTP) deadlock detection and self recovery, comprising the following steps:

determining, by a daemon configured in a network element, whether a deadlock occurs in an FTP upload task through a heartbeat detection mechanism, if the deadlock occurs, then recording socket resources used by an FTP upload operation at a storage location in a socket resource cycle queue which is created in the network element, and starting an FTP upload task end process; and

determining whether the socket resource cycle queue is full, if it is not full, then putting socket resource information occupied by the current deadlock into the socket resource cycle queue, if it is full, then releasing earliest socket resources from the socket resource cycle queue, and putting the socket resource information occupied by the current deadlock into the socket resource cycle queue.

2. The method according to claim 1, wherein the step of determining by the daemon whether a deadlock occurs in the FTP upload task through the heartbeat detection mechanism comprises:

A1;

transmitting, by the daemon, a heartbeat detection message to the FTP upload task periodically, and determining whether a response message of the heartbeat detection message is received within a certain period of time, if the response message is received, then resetting a heartbeat detection timer, and returning to step A1;

otherwise, executing step A2; and

A2;

adding 1 to a heartbeat failure counter, and determining whether a value of the heartbeat failure counter is greater than a preset value, if the value is greater than the preset value, then determining that the deadlock occurs in the FTP upload task;

otherwise, executing step A1.

3. The method according to claim 2, further comprising:

after determining that the deadlock occurs in the FTP upload task, resetting the heartbeat failure counter by the daemon, ending heartbeat detection initiated in this cycle, and returning to step A1 to initiate heartbeat detection in a next cycle.

4. The method according to claim 1, wherein a task priority to which the daemon belongs is higher than that of the FTP upload task.

5. The method according to claim 1, wherein the socket resources comprise a data connection socket, and/or a control connection socket.

6. A device for File Transfer Protocol (FTP) deadlock detection and self recovery, comprising:

a heartbeat detection initiating module and a buffer queue managing module, wherein

the heartbeat detection initiating module is configured to determine whether a deadlock occurs in an FTP upload task through a heartbeat detection mechanism; and

the buffer queue managing module is configured to record socket resources used by an FTP upload operation at a storage location in an assigned socket resource cycle queue, and start an FTP upload task end process; and

further configured to determine whether the socket resource cycle queue is full, if it is not full, then put socket resource information occupied by the current deadlock into the socket resource cycle queue, if it is full, then release earliest socket resources from the socket resource cycle queue, and is put the socket resource information occupied by the current deadlock into the socket resource cycle queue.

7. The device according to claim 6, wherein the heartbeat detection initiating module comprises:

a transmitting module and a determining module, wherein

the transmitting module is configured to transmit a heartbeat detection message to the FTP upload task periodically; and

the determining module is configured to determine whether a response message of the heartbeat detection message is received within a certain period of time, if the response message is received, then reset a heartbeat detection timer, and notify the transmitting module to periodically transmit a heartbeat detection message to the FTP upload task, if the response message is not received, then add 1 to a heartbeat failure counter; and

the determining module is further configured to determine whether a value of the heartbeat failure counter is greater than a preset value, if the value is greater than the preset value, then determine that the deadlock occurs in the FTP upload task, otherwise, periodically transmit a heartbeat detection message to the FTP upload task.

8. The device according to claim 7, wherein the buffer queue managing module is further configured to notify the determining module to reset the heartbeat failure counter after determining that the deadlock occurs in the FTP upload task.

9. The device according to claim 6, wherein the socket resources comprise:

a data connection socket, and/or a control connection socket;

a task priority to which the daemon belongs is higher than that of the FTP upload task.

10. A system for File Transfer Protocol (FTP) deadlock detection and self recovery, comprising a daemon, an FTP upload task unit, a socket resource cycle queue and an FTP server, wherein

the daemon is configured to determine that a deadlock occurs in an FTP upload task through a heartbeat detection mechanism, and then record socket resources used by an FTP upload operation at a storage location in an assigned socket resource cycle queue, and start an FTP upload task end process;

and further configured to determine whether the socket resource cycle queue is full, if it is not full, then put socket resource information occupied by the current deadlock into the socket resource cycle queue, otherwise, release earliest socket resources from the socket resource cycle queue, and put the socket resource information occupied by the current deadlock into the socket resource cycle queue;

the FTP upload task unit is configured to return a heartbeat response in response to the heartbeat detection of the daemon, acquire data from the daemon, establish a connection with the FTP and upload the acquired data to the FTP server;

the socket resource cycle queue is configured to store socket resources used by the FTP upload operation each time a deadlock occurs; and

the FTP server is configured to receive data uploaded by the FTP upload task.

11. The system according to claim 10, wherein the daemon comprises:

a heartbeat detection initiating module configured to determine whether the deadlock occurs in the FTP upload task through the heartbeat detection mechanism; and

a buffer queue managing module configured to record the socket resources used by the FTP upload operation at the storage location in the assigned socket resource cycle queue, and start the FTP upload task end process; and

further configured to determine whether the socket resource cycle queue is full, if it is not full, then put the socket resource information occupied by the current deadlock into the socket resource cycle queue, if it is full, then release the earliest socket resources from the socket resource cycle queue, and put the socket resource information occupied by the current deadlock into the socket resource cycle queue.