主动成员与被动成员 2. master 3. secondary 4. arbiter 5. oplog 二、配置副本集 1. 创建副本集 2. 向副本集添加服务器 3. 设置辅助服务器 4....主服务器由所有主动成员中的大多数投票产生，这被称为法定人数（quorum）。 主服务器的概念是（并且应该是）短暂的。理想情况下不应该固定地认为哪个节点是主服务器。...因为启用了auth，所以先要建立autokey文件，否则初始化副本集时会报错： "errmsg" : "Quorum check failed because not enough...voting nodes responded; required 2 but only the following 1 voting nodes responded: hdp4:27017; the following...nodes did not respond affirmatively: hdp3:27017 failed with Authentication failed."
For example, if Client A writes 1 then 2 to location X, Client B cannot read 2 followed by 1....is actually a measure of availability – if a write may go to either partition, will it eventually be responded...two writes may go to separate partitions, but because the failure of an entire ‘quorum’ of servers may...Systems such as ZooKeeper are explicitly sequentially consistent because there are few enough nodes in...a cluster that the cost of writing to quorum is relatively small.
假设2个角色：协调者(Coordinator)，参与者(Cohorts)。两者之间可以进行rpc。undo/redo：所有节点都预写式日志，且日志持久化在可靠的存储设备上。...to publish cluster state version [{}] (not enough nodes acknowledged, min master nodes [{}])",...publishingStartInNanos; ackListener.onCommit(TimeValue.timeValueNanos(commitTime)); // 2pc...DiscoveryNode[] pendingNodes = publishResponseHandler.pendingNodes(); // everyone may have just responded...(sendingController.getPublishingTimedOut()) { logger.debug("node {} responded
Nodes : node1 node2 Remote host reachability check succeeded....Total memory check passed Available memory check passed Swap space check failed Check failed on nodes...passed for "shmall" Kernel parameter check failed for "file-max" Check failed on nodes: node3 Kernel...check passed for "wmem_max" Kernel parameter check failed for "aio-max-nr" Check failed on nodes: ...check failed for "pdksh" Check failed on nodes: node3,node1 Package existence check passed for "
如果只有2个节点，投票算法就失效了。 因为每个节点上都只有1票。 这时就需要引入第三个设备：Quorum Device....Quorum Device 通常采用的是共享磁盘，这个磁盘也叫作Quorum disk。 这个Quorum Disk 也代表一票。...当2个结点的心跳出现问题时， 2个节点同时去争取Quorum Disk 这一票， 最早到达的请求被最先满足。故最先获得Quorum Disk的节点就获得2票。另一个节点就会被剔除。 ...in 10.2.0.1)) because the ocssd.bin will abort the node before it get evicted by another node if writing...to the voting disk is the problem.
ClusterState newState) { // check if min_master_nodes setting is too low and log warning...Please set it to at least a quorum of master-" + "eligible nodes (current value:...(o2.getId()); } } ElectMasterService的构造器读取discovery.zen.minimum_master_nodes配置到变量minimumMasterNodes...master nodes, we bail, because there are not enough master to elect from logger.warn...("not enough master nodes discovered during pinging (found [{}], but needed [{}]), pinging again",
TCP connectivity check failed for subnet "172.168.0.0" Node connectivity check failed Checking multicast...TCP connectivity check failed for subnet "172.168.0.0" Node connectivity check failed Checking multicast...Package existence check failed for "pdksh" /*节点3没装pdksh，这个包可装可不装*/ Check failed...OCR integrity check passed Checking Oracle Cluster Voting Disk configuration......Oracle Cluster Voting Disk configuration check passed Check: Time zone consistency Result: Time zone
Device/File Name : /dev/raw/raw14 Device/File integrity check...Device/File Name : /dev/raw/raw15 Device/File integrity check...Active nodes are rac1-server rac2-server ....--节点2集群alert日志： 2019-12-12 13:30:23.828 [cssd(6736)]CRS-1605:CSSD voting file is online: /dev/raw/raw13...Active nodes are rac1-server rac2-server . 2019-12-12 13:30:25.463 [crsd(6199)]CRS-1012:The OCR service
failed Result: Package existence check failed for "compat-gcc-7.3-2.96.128"....failed Result: Package existence check failed for "compat-gcc-c++-7.3-2.96.128"....failed Result: Package existence check failed for "compat-libstdc++-7.3-2.96.128"....nodes....Checking existence of VIP node application (required) Check passed.
This includes installing required service patches, updates, and drivers....Result: Shared resources check for node addition failed Interface information for node "jystdrac1"...OCR integrity check passed Checking Oracle Cluster Voting Disk configuration......Oracle Cluster Voting Disk configuration check passed Check: Time zone consistency Result: Time zone...Pre-check for node addition was unsuccessful on all the nodes.
Then there were concerns about the mandatory agreements required to publish enclave code in production...Each node requests a timeout from its SGX enclave using a trusted function. 2....In order to mitigate this to some degree, Sawtooth now includes z-test to check if a particular node...Because of this, I would consider PoET to only be useful in crash fault tolerant settings where there...nodes.
This includes installing required service patches, updates, and drivers....Result: Shared resources check for node addition failed Interface information for node "jystdrac1" ...OCR integrity check passed Checking Oracle Cluster Voting Disk configuration......Oracle Cluster Voting Disk configuration check passed Check: Time zone consistency Result: Time zone...Pre-check for node addition was unsuccessful on all the nodes.
The ACL Log is useful to troubleshoot failed commands blocked # by ACLs....that are # started as cluster nodes can....without this option set, with it set there is only a write outage. # Without a quorum of masters, slot...address discovery fails, because # addresses are NAT-ted or because ports are forwarded (the typical...->node->[tail] # [head], [tail] will always be uncompressed; inner nodes will compress. # 2: [head
： 2017-05-04 16:08:22,545 WARN org.apache.hadoop.hdfs.server.blockmanagement.BlockPlacementPolicy: Failed...to place enough replicas: expected size is 3 but only 0 storage types can be selected (replication=3...HOT:7, storageTypes=[DISK], creationFallbacks=[], replicationFallbacks=[ARCHIVE]}, newBlock=true) All required..._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1). ... at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.
Clearing Events Commands required on Isilon cluster v8 isi event groups bulk --resolved=true --ignore...--format=table --limit=10 --nodes=all --sort=used isi statistics drive -nall --verbose --format=table...Get statistics on drive busyness: isi statistics drive list --nodes=all --type=sas,sata --sort=busy |...cluster is very full, >80% and the action of a FlexProtect job running has a detrimental knock on effect because...IP-Life.net Neighborhood split (Gen6) or node pool split (pre-Gen6) can lead to full pools, poor performance, failed
self.jmxLeaderElectionBean, self.jmxLocalPeerBean); } catch (Exception e) { LOG.warn("Failed...TimeUnit.MILLISECONDS); /* * Sends more notifications if haven't received enough...view for a replica in the current or next voting view. */ switch...This is because there is at * least one corner case in which the ensemble can...if (initTicksShouldBeIncreased) { LOG.warn("Enough
that are # started as cluster nodes can....It is created and updated by Redis nodes....This improves the cluster ability # to resist to failures as otherwise an orphaned master can't be failed...# but compress all nodes between them...should use the default of 10 and raise this up to # 100 only in environments where very low latency is required
算法用三种消息类型： 1）选举消息 （Election Message: Sent to announce election.） 2）应答消息（Answer (Alive) Message: Responds...否则进程P向进程号比它大的进程发送Election Message 2）如果进程P发送Election Message后，没有接收到应答，它就会向其他节点广播Coordinator (Victory)...include the local node in pingMasters list, otherwise we may up electing ourselves without // any check...master nodes, we bail, because there are not enough master to elect from logger.warn("not...enough master nodes discovered during pinging (found [{}], but needed [{}]), pinging again",
Head nodes Index nodes * +-+ right +-+ +-+ * |2|-----...any search need only read ahead one more node than * otherwise required (to check for trailing marker...Steps 2-3 can fail because some other * thread noticed during a traversal a node with null value...CAS's enough to outweigh restart * cost....We can't check beforehand whether there are * index nodes because it might be the case that some
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