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In addition, every kind of DOM node is represented by an interface based on Node. These include Attr, CharacterData (which Text, Comment, CDATASection and ProcessingInstruction are all based on), and DocumentType.
In some cases, a particular feature of the base Node interface may not apply to one of its child interfaces; in that case, the inheriting node may return null or throw an exception, depending on circumstances. For example, attempting to add children to a node type that cannot have children will throw an exception.
Returns a live NodeList containing all the children of this node (including elements, text and comments). NodeList being live means that if the children of the Node change, the NodeList object is automatically updated.
Returns a string containing the name of the Node. The structure of the name will differ with the node type. E.g. An HTMLElement will contain the name of the corresponding tag, like 'audio' for an HTMLAudioElement, a Text node will have the '#text' string, or a Document node will have the '#document' string.
Adds the specified childNode argument as the last child to the current node. If the argument referenced an existing node on the DOM tree, the node will be detached from its current position and attached at the new position.
If callback is provided, and it returns false when called, the current recursion level is aborted, and the function resumes execution at the last parent's level. This can be used to abort loops once a node has been found (such as searching for a text node which contains a certain string).
\n In addition, every kind of DOM node is represented by an interface based on\n Node. These include Attr, CharacterData\n (which Text, Comment, CDATASection and\n ProcessingInstruction are all based on), and DocumentType.\n
\n In some cases, a particular feature of the base Node interface may not\n apply to one of its child interfaces; in that case, the inheriting node may\n return null or throw an exception, depending on circumstances. For example,\n attempting to add children to a node type that cannot have children will throw an\n exception.\n
\n Returns a live NodeList containing all the children of this node\n (including elements, text and comments). NodeList being live means that\n if the children of the Node change, the NodeList object is\n automatically updated.\n
\n Returns a string containing the name of the Node. The\n structure of the name will differ with the node type. E.g. An\n HTMLElement will contain the name of the corresponding tag, like\n 'audio' for an HTMLAudioElement, a Text\n node will have the '#text' string, or a Document node will\n have the '#document' string.\n
\n Adds the specified childNode argument as the last child to the current node.\n If the argument referenced an existing node on the DOM tree, the node will be detached\n from its current position and attached at the new position.\n
\n If callback is provided, and it returns\n false when called, the current recursion level is aborted, and the function\n resumes execution at the last parent's level. This can be used to abort loops once a\n node has been found (such as searching for a text node which contains a certain string).\n
A third, optional dimension (altitude) can also be included: key:ele (abbrev. for "elevation"). A node can also be defined as part of a particular layer=* or level=*, where distinct features pass over or under one another; say, at a bridge.
Nodes can be used on their own to define point features. When used in this way, a node will normally have at least one tag to define its purpose. Nodes may have multiple tags and/or be part of a relation. For example, a telephone box may be tagged simply with amenity=telephone, or could also be tagged with operator=*.
Where ways intersect at the same altitude, the two ways must share a node (for example, a road junction). If highways or railways cross at different heights without connecting they should ___ share a node (e.g. highway intersection with a bridge=*). Where ways cross at different heights they should be tagged with different layer=* or level=* values, or be tagged with location=* 'overground' or 'underground'. There are some exceptions to this rule, roads across dams are by current definition required to share a node with the waterway crossing the dam.
I've already hover over the node but it didn't show anything. Other than this node is critical error, I'm not seeing any other messages. CPU, memory & disk utilization for this server is not high at all as this is a low load server, thus I find this very annoying as giving false alarm.
Digging some more into this, but found this article, _Center/orionplatform/Content/core-calculate-node-status.htm. I changed my polling from 'mixed' to 'best' and it started showing green... I did have a few interfaces on the device that I purposefully was not polling, but I'm wondering if it was still seeing them anyway and saw their state. Again, still looking, but good-ish start?
Any time that you start an instance of Elasticsearch, you are starting a node. Acollection of connected nodes is called a cluster. If youare running a single node of Elasticsearch, then you have a cluster of one node.
As the cluster grows and in particular if you have large machine learning jobs orcontinuous transforms, consider separating dedicated master-eligible nodes fromdedicated data nodes, machine learning nodes, and transform nodes.
Every node is implicitly a coordinating node. This means that a node that hasan explicit empty list of roles via node.roles will only act as a coordinatingnode, which cannot be disabled. As a result, such a node needs to have enoughmemory and CPU in order to deal with the gather phase.
The master node is responsible for lightweight cluster-wide actions such ascreating or deleting an index, tracking which nodes are part of the cluster,and deciding which shards to allocate to which nodes. It is important forcluster health to have a stable master node.
Master nodes must have a path.data directory whose contentspersist across restarts, just like data nodes, because this is where thecluster metadata is stored. The cluster metadata describes how to read the datastored on the data nodes, so if it is lost then the data stored on the datanodes cannot be read.
It is important for the health of the cluster that the elected master node hasthe resources it needs to fulfill its responsibilities. If the elected masternode is overloaded with other tasks then the cluster will not operate well. Themost reliable way to avoid overloading the master with other tasks is toconfigure all the master-eligible nodes to be dedicated master-eligible nodeswhich only have the master role, allowing them to focus on managing thecluster. Master-eligible nodes will still also behave ascoordinating nodes that route requests from clients tothe other nodes in the cluster, but you should not use dedicated master nodesfor this purpose.
A small or lightly-loaded cluster may operate well if its master-eligible nodeshave other roles and responsibilities, but once your cluster comprises morethan a handful of nodes it usually makes sense to use dedicated master-eligiblenodes.
It may seem confusing to use the term "master-eligible" to describe avoting-only node since such a node is not actually eligible to become the masterat all. This terminology is an unfortunate consequence of history:master-eligible nodes are those nodes that participate in elections and performcertain tasks during cluster state publications, and voting-only nodes have thesame responsibilities even if they can never become the elected master.
High availability (HA) clusters require at least three master-eligible nodes, atleast two of which are not voting-only nodes. Such a cluster will be able toelect a master node even if one of the nodes fails.
Voting-only master-eligible nodes may also fill other roles in your cluster.For instance, a node may be both a data node and a voting-only master-eligiblenode. A dedicated voting-only master-eligible nodes is a voting-onlymaster-eligible node that fills no other roles in the cluster. To create adedicated voting-only master-eligible node, set:
Data nodes hold the shards that contain the documents you have indexed. Datanodes handle data related operations like CRUD, search, and aggregations.These operations are I/O-, memory-, and CPU-intensive. It is important tomonitor these resources and to add more data nodes if they are overloaded.
In a multi-tier deployment architecture, you use specialized data roles toassign data nodes to specific tiers: data_content,data_hot, data_warm,data_cold, or data_frozen. A node can belong to multiple tiers, but a nodethat has one of the specialized data roles cannot have the generic data role.
Hot data nodes are part of the hot tier.The hot tier is the Elasticsearch entry point for time series data and holds your most-recent,most-frequently-searched time series data.Nodes in the hot tier need to be fast for both reads and writes,which requires more hardware resources and faster storage (SSDs).For resiliency, indices in the hot tier should be configured to use one or more replicas.
Cold data nodes are part of the cold tier.When you no longer need to search time series data regularly, it can move fromthe warm tier to the cold tier. While still searchable, this tier is typicallyoptimized for lower storage costs rather than search speed.
Ingest nodes can execute pre-processing pipelines, composed of one or moreingest processors. Depending on the type of operations performed by the ingestprocessors and the required resources, it may make sense to have dedicatedingest nodes, that will only perform this specific task.
If you take away the ability to be able to handle master duties, to hold data,and pre-process documents, then you are left with a coordinating node thatcan only route requests, handle the search reduce phase, and distribute bulkindexing. Essentially, coordinating only nodes behave as smart load balancers. 5376163bf9
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