Java Code Examples for org.apache.hadoop.hbase.zookeeper.ZKUtil#getDataAndWatch()
The following examples show how to use
org.apache.hadoop.hbase.zookeeper.ZKUtil#getDataAndWatch() .
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Example 1
Source File: ZKVisibilityLabelWatcher.java From hbase with Apache License 2.0 | 6 votes |
@Override public void nodeDataChanged(String path) { if (path.equals(labelZnode) || path.equals(userAuthsZnode)) { try { watcher.syncOrTimeout(path); byte[] data = ZKUtil.getDataAndWatch(watcher, path); if (path.equals(labelZnode)) { refreshVisibilityLabelsCache(data); } else { refreshUserAuthsCache(data); } } catch (KeeperException ke) { LOG.error("Error reading data from zookeeper for node " + path, ke); // only option is to abort watcher.abort("ZooKeeper error getting data for node " + path, ke); } } }
Example 2
Source File: ZKSecretWatcher.java From hbase with Apache License 2.0 | 6 votes |
@Override public void nodeDataChanged(String path) { if (keysParentZNode.equals(ZKUtil.getParent(path))) { try { byte[] data = ZKUtil.getDataAndWatch(watcher, path); if (data == null || data.length == 0) { LOG.debug("Ignoring empty node "+path); return; } AuthenticationKey key = (AuthenticationKey)Writables.getWritable(data, new AuthenticationKey()); secretManager.addKey(key); } catch (KeeperException ke) { LOG.error(HBaseMarkers.FATAL, "Error reading data from zookeeper", ke); watcher.abort("Error reading updated key znode "+path, ke); } catch (IOException ioe) { LOG.error(HBaseMarkers.FATAL, "Error reading key writables", ioe); watcher.abort("Error reading key writables from znode "+path, ioe); } } }
Example 3
Source File: ClientZKSyncer.java From hbase with Apache License 2.0 | 6 votes |
private void watchAndCheckExists(String node) { try { if (ZKUtil.watchAndCheckExists(watcher, node)) { byte[] data = ZKUtil.getDataAndWatch(watcher, node); if (data != null) { // put the data into queue upsertQueue(node, data); } else { // It existed but now does not, should has been tracked by our watcher, ignore LOG.debug("Found no data from " + node); watchAndCheckExists(node); } } else { // cleanup stale ZNodes on client ZK to avoid invalid requests to server ZKUtil.deleteNodeFailSilent(clientZkWatcher, node); } } catch (KeeperException e) { server.abort("Unexpected exception during initialization, aborting", e); } }
Example 4
Source File: ZKVisibilityLabelWatcher.java From hbase with Apache License 2.0 | 5 votes |
public void start() throws KeeperException { watcher.registerListener(this); ZKUtil.createWithParents(watcher, labelZnode); ZKUtil.createWithParents(watcher, userAuthsZnode); byte[] data = ZKUtil.getDataAndWatch(watcher, labelZnode); if (data != null && data.length > 0) { refreshVisibilityLabelsCache(data); } data = ZKUtil.getDataAndWatch(watcher, userAuthsZnode); if (data != null && data.length > 0) { refreshUserAuthsCache(data); } }
Example 5
Source File: ClientZKSyncer.java From hbase with Apache License 2.0 | 5 votes |
@Override public void nodeCreated(String path) { if (!validate(path)) { return; } try { byte[] data = ZKUtil.getDataAndWatch(watcher, path); upsertQueue(path, data); } catch (KeeperException e) { LOG.warn("Unexpected exception handling nodeCreated event", e); } }
Example 6
Source File: MetaRegionLocationCache.java From hbase with Apache License 2.0 | 5 votes |
/** * Gets the HRegionLocation for a given meta replica ID. Renews the watch on the znode for * future updates. * @param replicaId ReplicaID of the region. * @return HRegionLocation for the meta replica. * @throws KeeperException if there is any issue fetching/parsing the serialized data. */ private HRegionLocation getMetaRegionLocation(int replicaId) throws KeeperException { RegionState metaRegionState; try { byte[] data = ZKUtil.getDataAndWatch(watcher, watcher.getZNodePaths().getZNodeForReplica(replicaId)); metaRegionState = ProtobufUtil.parseMetaRegionStateFrom(data, replicaId); } catch (DeserializationException e) { throw ZKUtil.convert(e); } return new HRegionLocation(metaRegionState.getRegion(), metaRegionState.getServerName()); }