CN103795572A - Method for switching master server and slave server and monitoring server - Google Patents
Method for switching master server and slave server and monitoring server Download PDFInfo
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- CN103795572A CN103795572A CN201410035499.XA CN201410035499A CN103795572A CN 103795572 A CN103795572 A CN 103795572A CN 201410035499 A CN201410035499 A CN 201410035499A CN 103795572 A CN103795572 A CN 103795572A
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Abstract
The invention discloses a method for switching a master server and a slave server and a monitoring server. The method comprises the steps of checking whether a registered resource node exists in a Zookeeper device or not, wherein the resource node is a label of the resource; when the registered resource node exists in the Zookeeper device, checking whether the number of server nodes in child nodes of the resource node is larger than or equal to a preset value; when the number of the server nodes in the child nodes of the resource node is larger than or equal to the preset value and a main server in the child nodes of the current resource node is not available, switching one slave server in the child nodes of the resource node into the main server. According to the method, the risks of data loss caused by the existence of two main servers at the same time cannot happen, and problems existing in the prior art are solved.
Description
Technical field
The embodiment of the present invention relates to Server assistance technology, relates in particular to a kind of changing method and monitoring server of principal and subordinate's server.
Background technology
Server guarantees high availability by master-slave equipment when service is provided conventionally, and for example MySQL uses Heartbeat software to realize the high availability of client/server.In the high-availability arrangement realizing by Linux Heartbeat, use at least two-server, described at least two-server comprises a central server, and described central server keeps and being connected of other servers by Heartbeat.What Heartbeat was most crucial comprises two parts, heartbeat inspecting part and resource take-over part, heartbeat inspecting can be undertaken by network link and serial ports, and support redundant link, between them, mutually send message and tell the state that the other side oneself is current, if do not receive the message that the other side sends within the time of specifying, so just think that the other side lost efficacy, at this moment need to start resource take-over module and take over the resource or the service that operate on peer.Like this, in the time switching principal and subordinate server, because the factors such as network delay can cause existing the problem of two master servers simultaneously, there is the risk of obliterated data.
Summary of the invention
In view of this, the embodiment of the present invention provides a kind of changing method and monitoring server of principal and subordinate's server, to solve the problem that can cause existing two master servers in prior art simultaneously.
First aspect, the embodiment of the present invention provides a kind of changing method of principal and subordinate's server, and described method comprises:
Check in Zookeeper equipment whether have chartered resource node, wherein, described resource node is a mark of resource;
In the time having chartered resource node in described Zookeeper equipment, check whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value;
When the quantity of the server node in the child node of described resource node is greater than or equal to preset value, and when master server in the child node of current described resource node is unavailable, be master server by one in the child node of described resource node from Server switching.
Second aspect, the embodiment of the present invention also provides a kind of monitoring server, and described monitoring server comprises:
The first checking module, for checking whether Zookeeper equipment has chartered resource node, wherein, described resource node is a mark of resource;
The second checking module, when have chartered resource node when described Zookeeper equipment, checks whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value;
Master-slave swap module, the quantity that is used for the server node of the child node of working as described resource node is greater than or equal to preset value, and when master server in the child node of current described resource node is unavailable, be master server by one in the child node of described resource node from Server switching.
Changing method and the monitoring server of principal and subordinate's server that the embodiment of the present invention provides, by the monitoring of the child node to Zookeeper equipment and resource node and described resource node, server node quantity in the child node of resource node is greater than or equal to master server in the child node of preset value and current resource node when unavailable, be master server by one in described resource node from Server switching, there will not be the risk that simultaneously has two master servers and cause loss of data, solved problems of the prior art.
Accompanying drawing explanation
Fig. 1 is the flow chart of the changing method of principal and subordinate's server of providing of first embodiment of the invention;
Fig. 2 is the complete server architecture Organization Chart in the changing method of principal and subordinate's server of providing of the embodiment of the present invention;
Fig. 3 is the Zookeeper node structure schematic diagram in the changing method of principal and subordinate's server of providing of the embodiment of the present invention;
Fig. 4 is the flow chart of the expansion servers in the changing method of principal and subordinate's server of providing of the embodiment of the present invention;
Fig. 5 is the flow chart of the changing method of principal and subordinate's server of providing of second embodiment of the invention;
Fig. 6 is the schematic diagram of the monitoring server that provides of third embodiment of the invention.
Embodiment
Below in conjunction with drawings and Examples, the present invention is described in further detail.Be understandable that, specific embodiment described herein is only for explaining the present invention, but not limitation of the invention.It also should be noted that, for convenience of description, in accompanying drawing, only show part related to the present invention but not full content.
Fig. 1 shows the first embodiment of the present invention.
Fig. 1 is the flow chart of the changing method of principal and subordinate's server of providing of first embodiment of the invention, and the method is applicable to the server cluster of Zookeeper equipment control, can be carried out by monitoring server.Fig. 2 is the complete server architecture Organization Chart in the changing method of principal and subordinate's server of providing of the embodiment of the present invention, as shown in Figure 2, comprise Zookeeper equipment at complete server architecture framework, monitoring server, master server and from server, monitoring server, master server and from server respectively with Zookeeper equipment keep heartbeat be connected, monitoring server keeps heartbeat to be connected with master server and from server respectively, monitoring server is monitored master server and is also reported at any time Zookeeper equipment from the operating state of server, master server with also keeping the prerequisite that is connected of heartbeat to the operating state of Zookeeper device report oneself and checking that whether monitoring server revise oneself up-to-date operating state in Zookeeper equipment with Zookeeper equipment respectively from server.The method specifically comprises the steps:
Wherein, described resource node is a mark of resource, is a lasting node, is the dummy node that monitoring server is registered the resource of needs monitoring in Zookeeper equipment.Resource refers to data (as data such as film, TV, game) or form etc.
Wherein, lasting node is the one of Zookeeper node type.Zookeeper node type comprises lasting node and interim node.Lasting node refers to after node creates, just exists always, until have deletion action initiatively to remove this node, and can not lose efficacy and disappear because of the client session that creates this node.Interim node is different with lasting node, and the life cycle of interim node and client session binding, that is to say, if client session lost efficacy, this node will be eliminated automatically so, wherein session failed and disconnected disconnection, and can not create child node below interim node.
Zookeeper is a reliable coherent system for large-scale distributed system, and the function providing comprises: configuring maintenance, name Service, distributed synchronization, group service etc.The target of Zookeeper is exactly the key service that packaged complexity is easily made mistakes, and the interface and the performance system efficient, function-stable that are simple and easy to use are offered to user.Zookeeper equipment is the equipment that Zookeeper software is installed, and Zookeeper software can be arranged in monitoring server, also can be arranged on and in other servers, form Zookeeper server.In order to bring into play better the advantage of Zookeeper, be generally by the server composition Zookeeper cluster of the multiple Zookeeper of being provided with softwares, in order to avoid while wherein having Zookeeper server to delay machine, other Zookeeper server can continue to provide service.Generally in Zookeeper cluster, dispose odd number Zookeeper server, because whole Zookeeper cluster is delayed, machine is delayed with Zookeeper server, and machine number is more than half to be as the criterion.
Monitoring server checks in Zookeeper equipment whether have chartered resource node, when in Zookeeper equipment not when chartered resource node, have again resource to need monitoring, at this moment monitoring server is lasting node by the resource registering of needs monitoring simultaneously.
Whether step 120, in the time having chartered resource node in described Zookeeper equipment, check in the child node of described resource node and have quantity to be greater than the server node of preset value.
Fig. 3 is the Zookeeper node structure schematic diagram in the changing method of principal and subordinate's server of providing of the embodiment of the present invention.As shown in Figure 3, first Zookeeper node comprises Zookeeper root node, and the child node of Zookeeper root node is monitor service root node, and the child node of monitor service root node is resource node, and the child node of resource node is server node.Wherein, monitor service root node is lasting node, and resource node is lasting node, and server node is interim node.
In the time having chartered resource node in described Zookeeper equipment, whether monitoring server checks in the child node of described resource node has quantity to be greater than the server node of preset value.Generally, the child node of resource node comprises at least two server nodes, master server and one are from server, at this moment preset value is 2, certainly, those skilled in the art also can be made as one by preset value according to the demand of oneself and be greater than 2 value, and at this moment the child node of resource node just can comprise a master server and multiple from server.
In the time that the quantity of the server node in the child node of described resource node is greater than or equal to preset value, illustrate that server node in the child node of described resource node comprises a master server and at least one is from server.The master server of the child node of the current described resource node of the unavailable expression of master server in the child node of current described resource node delay machine or process unavailable, can not continue to provide service.In the time meeting above-mentioned two conditions, monitoring server is master server by one in described resource node from Server switching simultaneously.
The present embodiment is by the monitoring of the child node to Zookeeper equipment and resource node and described resource node, server node quantity in the child node of resource node is greater than or equal to master server in the child node of preset value and current resource node when unavailable, be master server by one in described resource node from Server switching, there will not be the risk that simultaneously has two master servers and cause loss of data, solved problems of the prior art.
Exemplary, described method also comprises:
In the time that the quantity of the server node in the child node of described resource node is less than preset value, in the child node of described resource node, add server.
If the quantity of the server node in the child node of described resource node is less than preset value, namely the quantity of the server node in the child node of resource node does not reach preset value, can not satisfy the demands, at this moment need expansion servers, first from survival server list, find the resource that described resource node is corresponding, under described resource node, add server, make the server of described interpolation load the resource that described resource node is corresponding, the server of described interpolation become in the child node of described resource node from server.In the time that the server in the child node of resource node rolls off the production line, while making the quantity of the server in the child node of resource node be less than preset value, monitoring server can be selected server and take over the server rolling off the production line, can accomplish without human intervention or the interference to existing master server, the effect of dynamic expansion server.
Wherein, described survival server list is to record the list of Zookeeper node structure, especially comprises the server node in the child node of resource node, and corresponding with corresponding resource node.Described survival server list is kept on Zookeeper equipment.
Fig. 4 is the flow chart of the expansion servers in the changing method of principal and subordinate's server of providing of the embodiment of the present invention.First need the server of expansion to report to monitoring server, by the operating state of monitoring server monitoring oneself, need the server of expansion to get an available data resource, i.e. resource corresponding to resource node registered Zookeeper node under resource node; The described server that needs expansion loads described data resource after getting described data resource, become in the child node of resource node from server node; When the quantity of the server node in the child node of the resource node at this server place is greater than or equal to preset value, this server can switch to master server by monitored server, becomes the primary server joint in the child node of resource node; No matter in the time that this server is in from server node or primary server joint, and when this server cannot continue to provide service, restart server or close this server, restarting after server, again report to monitoring server, and get available data resource and be registered as Zookeeper node; If when this server still cannot provide service through restarting, close this server.
Exemplary, in the child node of described resource node, add server, comprising:
For the server adding loads the resource that described resource node is corresponding;
The server of described interpolation is added in survival server list;
The resource having loaded according to the server of described interpolation, writes the server info of interpolation in the child node of the resource node loading at the server of described interpolation.
Monitoring server is that the server adding loads the resource that described resource node is corresponding, the server of interpolation that has loaded the resource that described resource node is corresponding is added in survival server list to the child node place of the resource node by the server record of described interpolation in survival server list.The resource corresponding according to described resource node, monitoring server writes the resource node of the server loading of described interpolation on Zookeeper equipment, the server of described interpolation oneself also checks the resource node of the server loading that whether has write described interpolation on Zookeeper equipment on Zookeeper equipment, if do not write fashionable, just the server of described interpolation on Zookeeper equipment, write oneself load resource node.In the child node of the resource node that meanwhile, monitoring server loads at the server of described interpolation, write the server info of interpolation.
Exemplary, add server in the child node of described resource node after, also comprise:
When the server in the child node of described resource node exit or unavailable or add server and Zookeeper equipment between session disconnect time, from the child node of described resource node, remove the server of described interpolation.
Wherein, described server exits and refers to the server hardware problems such as machine of delaying, and server is unavailable refers to that software process etc. is unavailable.In the time that the server in the child node of described resource node comprises that the server of described interpolation runs into hardware problem or software issue and causes the session unavailable or described server and Zookeeper equipment of described server to disconnect, respective server node in the child node of monitoring server removing resource node, i.e. corresponding server node in the child node of the resource node in removal survival server list.
Fig. 5 shows the second embodiment of the present invention.
Fig. 5 is the flow chart of the changing method of principal and subordinate's server of providing of second embodiment of the invention.As shown in Figure 5, first monitoring server checks that whether the monitor service root node in Zookeeper equipment is corresponding with oneself, corresponding in the situation that, whether monitoring server checks in Zookeeper equipment has data resource to need monitoring, in the time having data resource to monitor, described data resource to be registered as to resource node, monitoring server judges in the child node of resource node, whether have master server and from server, judged result is divided the explanation of three kinds of situations: when the child node of resource node has master server and checks master server state during from server, in the time only having master server not from server in the child node of described resource node, need to judge this only have master server not from the problem of server have do not have processed, check master server state when processed being judged as certainly, negate not have monitoring server command server when processed to load the resource that described resource node is corresponding being judged as, when there is no master server in the child node of resource node and during from server, monitoring server command server loads the resource that described resource node is corresponding, unavailable or while disconnecting at master server state in the time checking master server state, by one be master server from Server switching, and to get back to initial state be that monitoring server checks monitor service root node in Zookeeper equipment and whether oneself corresponding, after monitoring server command server loads the resource that described resource node is corresponding, getting back to initial state is that monitoring server checks that whether the monitor service root node in Zookeeper equipment is corresponding with oneself.
Whether the present embodiment has master server in the child node of resource node and from server by judging, being divided into three kinds of judged results processes respectively, there is at the same time master server and check master server state during from server, if master server state be unavailable or disconnect time be master server by one from Server switching, in the time only having master server not from server, judge this problem have do not have processed, expanded server if processed, illustrate and have master server and from server simultaneously, if there is not master server and from server or only having master server not have when processed from the problem of server simultaneously, command server loads the resource that described resource node is corresponding, carry out the expansion of server.By the unified monitoring of monitoring server, there will not be the risk that simultaneously has two master servers and cause loss of data, and realized the dynamic expansion of server.
Fig. 6 shows the third embodiment of the present invention.
Fig. 6 is the schematic diagram of the monitoring server that provides of third embodiment of the invention.The monitoring server that the present embodiment provides is for the changing method of principal and subordinate's server of realizing the first embodiment and providing.As shown in Figure 6, the monitoring server described in the present embodiment comprises: the first checking module 610, the second checking module 620 and master-slave swap module 630.
Wherein, the first checking module 610 is for checking whether Zookeeper equipment has chartered resource node, and wherein, described resource node is a mark of resource.
The second checking module 620 when have chartered resource node when described Zookeeper equipment, checks whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value.
Master-slave swap module 630 is greater than or equal to preset value for the quantity of the server node of the child node when described resource node, and when master server in the child node of current described resource node is unavailable, be master server by one in the child node of described resource node from Server switching.
The present embodiment checks in Zookeeper equipment whether have chartered resource node by the first checking module, check at the second checking module in the time having chartered resource node in Zookeeper equipment whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value, the quantity of the server node in the child node of resource node is greater than or equal to preset value and current master server when unavailable, be master server by one in the child node of described resource node from Server switching, there will not be the risk that simultaneously has two master servers and cause loss of data, problems of the prior art are solved.
Exemplary, described monitoring server also comprises:
Server Extension module in the time that the quantity of the server node of the child node of described resource node is less than preset value, is added server in the child node of described resource node.
Exemplary, described Server Extension module comprises:
Load submodule, be used to the server of interpolation to load the resource that described resource node is corresponding;
Add submodule, for the server of described interpolation being added to survival server list;
Write submodule, for the resource having loaded according to the server of described interpolation, in the child node of the resource node loading at the server of described interpolation, write the server info of interpolation.
Exemplary, described monitoring server also comprises:
Remove module, for exit when the server of the child node of described resource node or unavailable or the server and the Zookeeper equipment that add between session disconnection time, from described resource node child node, remove the server of described interpolation.
Note, above are only preferred embodiment of the present invention and institute's application technology principle.Skilled person in the art will appreciate that and the invention is not restricted to specific embodiment described here, can carry out for a person skilled in the art various obvious variations, readjust and substitute and can not depart from protection scope of the present invention.Therefore, although the present invention is described in further detail by above embodiment, the present invention is not limited only to above embodiment, in the situation that not departing from the present invention's design, can also comprise more other equivalent embodiment, and scope of the present invention is determined by appended claim scope.
Claims (8)
1. a changing method for principal and subordinate's server, is characterized in that, described method comprises:
Check in Zookeeper equipment whether have chartered resource node, wherein, described resource node is a mark of resource;
In the time having chartered resource node in described Zookeeper equipment, check whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value;
When the quantity of the server node in the child node of described resource node is greater than or equal to preset value, and when master server in the child node of current described resource node is unavailable, be master server by one in the child node of described resource node from Server switching.
2. method according to claim 1, is characterized in that, described method also comprises:
In the time that the quantity of the server node in the child node of described resource node is less than preset value, in the child node of described resource node, add server.
3. method according to claim 2, is characterized in that, in the child node of described resource node, adds server, comprising:
For the server adding loads the resource that described resource node is corresponding;
The server of described interpolation is added in survival server list;
The resource having loaded according to the server of described interpolation, writes the server info of interpolation in the child node of the resource node loading at the server of described interpolation.
4. method according to claim 2, is characterized in that, after adding server, also comprises in the child node of described resource node:
When the server in the child node of described resource node exit or unavailable or add server and Zookeeper equipment between session disconnect time, from the child node of described resource node, remove the server of described interpolation.
5. a monitoring server, is characterized in that, described monitoring server comprises:
The first checking module, for checking whether Zookeeper equipment has chartered resource node, wherein, described resource node is a mark of resource;
The second checking module, when have chartered resource node when described Zookeeper equipment, checks whether the quantity of the server node in the child node of described resource node is greater than or equal to preset value;
Master-slave swap module, the quantity that is used for the server node of the child node of working as described resource node is greater than or equal to preset value, and when master server in the child node of current described resource node is unavailable, be master server by one in the child node of described resource node from Server switching.
6. monitoring server according to claim 5, is characterized in that, described monitoring server also comprises:
Server Extension module in the time that the quantity of the server node of the child node of described resource node is less than preset value, is added server in the child node of described resource node.
7. monitoring server according to claim 6, is characterized in that, described Server Extension module comprises:
Load submodule, be used to the server of interpolation to load the resource that described resource node is corresponding;
Add submodule, for the server of described interpolation being added to survival server list;
Write submodule, for the resource having loaded according to the server of described interpolation, in the child node of the resource node loading at the server of described interpolation, write the server info of interpolation.
8. monitoring server according to claim 6, is characterized in that, described monitoring server also comprises:
Remove module, when the server in the child node of described resource node exit or unavailable or add server and Zookeeper equipment between session disconnect time, from the child node of described resource node, remove the server of described interpolation.
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