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MapReduce模型采用Master（JobTracker）-Slave（TaskTracker）结构，试描述JobTracker和TasKTracker的功能。
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关于任务调度流程,下面说法错误的是()。
A、客户端将作业提交到JobTracker，JobTracker通知任务调度器进行初始化B、任务调度器将任务分配给某个TaskTracekrC、TaskTracker通过心跳领取分配给自己的任务D、JobTracker将任务推送给对应的TaskTracker
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MapReduce中()会周期性地通过“心跳”将本节点上资源的使用情况和任务的运行进度汇报给JobTracker,同时接收JobTracker发送过来的命令并执行相应的操作。
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You need to replicate a table from a master to a slave. The master and slave copies of the table will have different number of columns.Which two conditions must be true?()
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When backing up a replication slave, which three should also be backed up in addition to data?()
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以下关于VRRP说法正确的是:()
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试题（71）～（75）A Bluetooth device can be either a master or a slave and any of the devices within a （71）can be the master. There is only one master and there can be up to （72） active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to （73） parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to （74） mode before it can become active. Within a network, all （75） communications are prohibited.（71）A. Wireless LANB. Wireless MANC. Cellular radio networkD. Piconet（72）A. 7B. 15C. 63D. 255（73）A. 127B. 255C. 511D. 1023（74）A. masterB. standby slaveC. parked slaveD. active slave（75）A. master-to-masterB. master-to-slaveC. slave-to-slaveD. slave-to-master
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A Bluetooth device can be either a master or a slave and any of the devices within a （ ）can be the master. There is only one master and there can be up to （请作答此空） active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to （ ） parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to （ ） mode before it can become active. Within a network, all （ ） communications are prohibited.A.7
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A Bluetooth device can be either a master or a slave and any of the devices within a （ ）can be the master. There is only one master and there can be up to （ ） active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to （ ） parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to （请作答此空） mode before it can become active. Within a network, all （ ） communications are prohibited.A.MASTER
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A Bluetooth device can be either a master or a slave and any of the devices within a （ ）can be the master. There is only one master and there can be up to （ ） active slave devices at a time within a single network. In addition, a device may be a standby slave or a parked slave. There can be up to （ ） parked slaves. If there are already maximum number of active slaves, then a parked slave must wait until one of the active slaves switches to （ ） mode before it can become active. Within a network, all （请作答此空） communications are prohibited.A.MASTER-TO-MASTER
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当主机发送ARP请求时，启动了VRRP协议的那个设备用什么MAC来进行回应？（）A、Master网关用自己的物理MAC回应B、Master网关用虚拟MAC回应C、Slave网关用自己的物理MAC回应D、Slave网关用虚拟MAC回应
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在给硬盘跳线时，我们常常会看到“Master”和“Slave”标记，它们的含义分别为（）。A、“Master”为主盘、”Slave”为从盘B、“Master”为从盘、”Slave”为从盘C、“Master”为第一IDE接口硬盘、“slave”第二IDE接口硬盘D、”Master”为第二IDE接口硬盘、“Slave”第一IDE接口硬盘
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关于MapReduce容错机制，下面说法正确的是（）A、JobTracker可以有多个，因此不存在单点故障问题B、TaskTracker通过周期性心跳向JobTracker表明自己还活着C、MapTask失败后，能够被重新调度到其他节点上执行D、ReduceTask失败后，能够被重新调度到其他节点上执行
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以下关于VRRP说法正确的是：（）A、只有Master处理发往虚拟路由器的数据；B、只有Slave处理发往虚拟路由器的数据；C、Master和Slave都可以处理发往同一虚拟路由器的数据，并且可以流量分担；D、默认只有Master处理发往虚拟路由器的数据，可以通过配置开启Slave处理发往同一虚拟路由器的数据的功能
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You need to dump the data from the master server and import it into a new slave server. Which mysqldump option can be used when dumping data from the master server in order to include the master server's binary log information?（）A、Include-master-infoB、Master-binlogC、Include-log-fileD、Master-data
考题
当主机发送ARP请求时，启动了VRRP协议的（）设备用什么MAC来进行回应。A、Master网关用自己的物理MAC回应B、Master网关用虚拟MAC回应C、Slave网关用自己的物理MAC回应D、Slave网关用虚拟MAC回应
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多选题When backing up a replication slave, which three should also be backed up in addition to data?（）AThe master.info and relay.info filesBThe relay log filesCThe relay index fileDMysql.slave_master_info tableEMysql.slave_relay_log_info tableFMysql.slave_worker_info table
考题
多选题You need to replicate a table from a master to a slave. The master and slave copies of the table will have different number of columns. Which two conditions must be true?（）AEach extra column in the copy with more columns must not have a default valueBColumns that are common to both versions of the table must be defined in the same order on the master and the slaveCThe slave database cannot have more columns than the master. Only the master database can have more columnsDColumns that are common to both versions of the table must come first in the table definition, before any additional columns are additional columns are defined on either serverEThe master database cannot have more columns than the slave. Only the slave deatbase can have more columns
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单选题An existing master-slave setup is currently using a delayed replication of one hour. The master has crashed and the slave must be "rolled forward" to provide all the latest data. The SHOW SLAVE STATUS indicates the following values: RELAY_LOG_FILE =hostname-relay-bin.00004 RELAY_LOG_POS = 1383 Which command set would make the slave current?（）A
STOP SLAVE; CHANGE MASTER TO MASTER_DELAY =0, RELAY_LOG_FILE = 'hostnamerelay- bin.00004' , RELAY_LOG_POS= 1383B
STOP SLAVE; CHANGE MASTER TO RELAY_LOG_FILE = 'hostname-relay-bin.00004', RELAY_LOG_POS = 1383C
STOP SLAVE; CHANGE MASTER TO MASTER_DELAY=0; START SLAVED
STOP SLAVE; SET GLOBAL master_delay =0; START SLAVE
考题
多选题关于VRRP slave设备的描述，正确的是（）A当Slave收到Master发送的VRRP报文时，可判断Master的状态是否正常B当收到优先级为0的VRRP报文时，Slave会直接切换到MasterCSlave会丢弃目的Mac为虚拟MAC地址的IP报文DSlave会响应目的IP地址为虚拟IP地址的IP报文
考题
单选题关于任务调度流程，下面说法错误的是（）A
客户端将作业提交到JobTracker，JobTracker通知任务调度器进行初始化B
任务调度器将任务分配给某个TaskTracekrC
TaskTracker通过心跳领取分配给自己的任务D
JobTracker将任务推送给对应的TaskTracker
考题
单选题You need to dump the data from the master server and import it into a new slave server. Which mysqldump option can be used when dumping data from the master server in order to include the master server's binary log information?（）A
Include-master-infoB
Master-binlogC
Include-log-fileD
Master-data
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