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本篇內(nèi)容介紹了“zk中的節(jié)點(diǎn)配額,配額管理樹和狀態(tài)信息分別是什么”的有關(guān)知識(shí),在實(shí)際案例的操作過程中,不少人都會(huì)遇到這樣的困境,接下來就讓小編帶領(lǐng)大家學(xué)習(xí)一下如何處理這些情況吧!希望大家仔細(xì)閱讀,能夠?qū)W有所成!
Qutas 主要完成配額目錄的定義:
限制信息包含某個(gè)路徑的要求大小
在zk中目錄結(jié)構(gòu)為/zookeeper/quota/xxx/zookeeper_limits
狀態(tài)信息包含對(duì)某個(gè)路徑實(shí)際大小
/zookeeper/quota/xxx/zookeeper_stats
以及提供path轉(zhuǎn)換對(duì)應(yīng)的限制path和狀態(tài)path方法
為處理配額提供定義
Quotas類路徑org.apache.zookeeper
屬性
/** the zookeeper nodes that acts as the management and status node **/ public static final String procZookeeper = "/zookeeper"; /** the zookeeper quota node that acts as the quota * management node for zookeeper */ public static final String quotaZookeeper = "/zookeeper/quota"; /** * the limit node that has the limit of * a subtree */ public static final String limitNode = "zookeeper_limits"; /** * the stat node that monitors the limit of * a subtree. */ public static final String statNode = "zookeeper_stats"; 方法 /** * return the quota path associated with this * prefix * @param path the actual path in zookeeper. * @return the limit quota path */ public static String quotaPath(String path) { return quotaZookeeper + path + "/" + limitNode; } /** * return the stat quota path associated with this * prefix. * @param path the actual path in zookeeper * @return the stat quota path */ public static String statPath(String path) { return quotaZookeeper + path + "/" + statNode; }
PathTrie 字典樹完成配額目錄的增刪查 路徑查找 內(nèi)部類 TrieNode 屬性 final String value; final Map<String, TrieNode> children; boolean property;//節(jié)點(diǎn)設(shè)置了配額,屬性為true,否則為false TrieNode parent; 方法 //添加子節(jié)點(diǎn) void addChild(String childName, TrieNode node) { this.children.putIfAbsent(childName, node); } /** * Delete child from this node. *刪除子節(jié)點(diǎn) * @param childName the name of the child to be deleted */ void deleteChild(String childName) { this.children.computeIfPresent(childName, (key, childNode) -> { // Node no longer has an external property associated childNode.setProperty(false); // Delete it if it has no children (is a leaf node) if (childNode.isLeafNode()) { childNode.setParent(null); return null; } return childNode; }); } 構(gòu)造方法: public PathTrie() { this.rootNode = new TrieNode(null, "/"); } 方法 /** * Add a path to the path trie. All paths are relative to the root node. * * @param path the path to add to the trie */ public void addPath(final String path) { Objects.requireNonNull(path, "Path cannot be null"); final String[] pathComponents = StringUtils.split(path, '/'); if (pathComponents.length == 0) { throw new IllegalArgumentException("Invalid path: " + path); } writeLock.lock(); try { TrieNode parent = rootNode; for (final String part : pathComponents) { TrieNode child = parent.getChild(part); if (child == null) { child = new TrieNode(parent, part); parent.addChild(part, child); } parent = child; } parent.setProperty(true); } finally { writeLock.unlock(); } } /** * Return true if the given path exists in the trie, otherwise return false; * All paths are relative to the root node. * * @param path the input path * @return the largest prefix for the */ public boolean existsNode(final String path) { Objects.requireNonNull(path, "Path cannot be null"); final String[] pathComponents = StringUtils.split(path, '/'); if (pathComponents.length == 0) { throw new IllegalArgumentException("Invalid path: " + path); } readLock.lock(); try { TrieNode parent = rootNode; for (final String part : pathComponents) { if (parent.getChild(part) == null) { // the path does not exist return false; } parent = parent.getChild(part); LOG.debug("{}", parent); } } finally { readLock.unlock(); } return true; } StatsTrack 記錄節(jié)點(diǎn)實(shí)際的count和bytes長(zhǎng)度信息 屬性 private int count; private long bytes; private String countStr = "count"; private String byteStr = "bytes"; public String toString() { return countStr + "=" + count + "," + byteStr + "=" + bytes; }
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