org.apache.hadoop.hbase.zookeeper.ZNodePaths Maven / Gradle / Ivy
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package org.apache.hadoop.hbase.zookeeper;
import static org.apache.hadoop.hbase.HConstants.DEFAULT_ZOOKEEPER_ZNODE_PARENT;
import static org.apache.hadoop.hbase.HConstants.SPLIT_LOGDIR_NAME;
import static org.apache.hadoop.hbase.HConstants.ZOOKEEPER_ZNODE_PARENT;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.ServerName;
import org.apache.hadoop.hbase.client.RegionInfo;
import org.apache.hadoop.hbase.client.RegionReplicaUtil;
import org.apache.yetus.audience.InterfaceAudience;
/**
* Class that hold all the paths of znode for HBase.
*/
@InterfaceAudience.Private
public class ZNodePaths {
// TODO: Replace this with ZooKeeper constant when ZOOKEEPER-277 is resolved.
public static final char ZNODE_PATH_SEPARATOR = '/';
public static final String META_ZNODE_PREFIX_CONF_KEY = "zookeeper.znode.metaserver";
public static final String META_ZNODE_PREFIX = "meta-region-server";
private static final String DEFAULT_SNAPSHOT_CLEANUP_ZNODE = "snapshot-cleanup";
// base znode for this cluster
public final String baseZNode;
/**
* The prefix of meta znode. Does not include baseZNode. Its a 'prefix' because meta replica id
* integer can be tagged on the end (if no number present, it is 'default' replica).
*/
private final String metaZNodePrefix;
// znode containing ephemeral nodes of the regionservers
public final String rsZNode;
// znode containing ephemeral nodes of the draining regionservers
public final String drainingZNode;
// znode of currently active master
public final String masterAddressZNode;
// znode of this master in backup master directory, if not the active master
public final String backupMasterAddressesZNode;
// znode containing the current cluster state
public final String clusterStateZNode;
// znode used for table disabling/enabling
// Still used in hbase2 by MirroringTableStateManager; it mirrors internal table state out to
// zookeeper for hbase1 clients to make use of. If no hbase1 clients disable. See
// MirroringTableStateManager. To be removed in hbase3.
@Deprecated
public final String tableZNode;
// znode containing the unique cluster ID
public final String clusterIdZNode;
// znode used for log splitting work assignment
public final String splitLogZNode;
// znode containing the state of the load balancer
public final String balancerZNode;
// znode containing the state of region normalizer
public final String regionNormalizerZNode;
// znode containing the state of all switches, currently there are split and merge child node.
public final String switchZNode;
// znode containing namespace descriptors
public final String namespaceZNode;
// znode of indicating master maintenance mode
public final String masterMaintZNode;
// znode containing all replication state.
public final String replicationZNode;
// znode containing a list of all remote slave (i.e. peer) clusters.
public final String peersZNode;
// znode containing all replication queues
public final String queuesZNode;
// znode containing queues of hfile references to be replicated
public final String hfileRefsZNode;
// znode containing the state of the snapshot auto-cleanup
final String snapshotCleanupZNode;
public ZNodePaths(Configuration conf) {
baseZNode = conf.get(ZOOKEEPER_ZNODE_PARENT, DEFAULT_ZOOKEEPER_ZNODE_PARENT);
metaZNodePrefix = conf.get(META_ZNODE_PREFIX_CONF_KEY, META_ZNODE_PREFIX);
rsZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.rs", "rs"));
drainingZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.draining.rs", "draining"));
masterAddressZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.master", "master"));
backupMasterAddressesZNode =
joinZNode(baseZNode, conf.get("zookeeper.znode.backup.masters", "backup-masters"));
clusterStateZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.state", "running"));
tableZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.tableEnableDisable", "table"));
clusterIdZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.clusterId", "hbaseid"));
splitLogZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.splitlog", SPLIT_LOGDIR_NAME));
balancerZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.balancer", "balancer"));
regionNormalizerZNode =
joinZNode(baseZNode, conf.get("zookeeper.znode.regionNormalizer", "normalizer"));
switchZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.switch", "switch"));
namespaceZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.namespace", "namespace"));
masterMaintZNode =
joinZNode(baseZNode, conf.get("zookeeper.znode.masterMaintenance", "master-maintenance"));
replicationZNode = joinZNode(baseZNode, conf.get("zookeeper.znode.replication", "replication"));
peersZNode =
joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.peers", "peers"));
queuesZNode = joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.rs", "rs"));
hfileRefsZNode =
joinZNode(replicationZNode, conf.get("zookeeper.znode.replication.hfile.refs", "hfile-refs"));
snapshotCleanupZNode = joinZNode(baseZNode,
conf.get("zookeeper.znode.snapshot.cleanup", DEFAULT_SNAPSHOT_CLEANUP_ZNODE));
}
@Override
public String toString() {
return new StringBuilder().append("ZNodePaths [baseZNode=").append(baseZNode)
.append(", rsZNode=").append(rsZNode).append(", drainingZNode=").append(drainingZNode)
.append(", masterAddressZNode=").append(masterAddressZNode)
.append(", backupMasterAddressesZNode=").append(backupMasterAddressesZNode)
.append(", clusterStateZNode=").append(clusterStateZNode).append(", tableZNode=")
.append(tableZNode).append(", clusterIdZNode=").append(clusterIdZNode)
.append(", splitLogZNode=").append(splitLogZNode).append(", balancerZNode=")
.append(balancerZNode).append(", regionNormalizerZNode=").append(regionNormalizerZNode)
.append(", switchZNode=").append(switchZNode).append(", namespaceZNode=")
.append(namespaceZNode).append(", masterMaintZNode=").append(masterMaintZNode)
.append(", replicationZNode=").append(replicationZNode).append(", peersZNode=")
.append(peersZNode).append(", queuesZNode=").append(queuesZNode).append(", hfileRefsZNode=")
.append(hfileRefsZNode).append(", snapshotCleanupZNode=").append(snapshotCleanupZNode)
.append("]").toString();
}
/** Returns the znode string corresponding to a replicaId */
public String getZNodeForReplica(int replicaId) {
if (RegionReplicaUtil.isDefaultReplica(replicaId)) {
return joinZNode(baseZNode, metaZNodePrefix);
} else {
return joinZNode(baseZNode, metaZNodePrefix + "-" + replicaId);
}
}
/**
* Parses the meta replicaId from the passed path.
* @param path the name of the full path which includes baseZNode.
*/
public int getMetaReplicaIdFromPath(String path) {
// Extract the znode from path. The prefix is of the following format.
// baseZNode + PATH_SEPARATOR.
int prefixLen = baseZNode.length() + 1;
return getMetaReplicaIdFromZNode(path.substring(prefixLen));
}
/**
* Parse the meta replicaId from the passed znode
* @param znode the name of the znode, does not include baseZNode
*/
public int getMetaReplicaIdFromZNode(String znode) {
return znode.equals(metaZNodePrefix)
? RegionInfo.DEFAULT_REPLICA_ID
: Integer.parseInt(znode.substring(metaZNodePrefix.length() + 1));
}
/** Returns True if meta znode. */
public boolean isMetaZNodePrefix(String znode) {
return znode != null && znode.startsWith(this.metaZNodePrefix);
}
/** Returns True is the fully qualified path is for meta location */
public boolean isMetaZNodePath(String path) {
int prefixLen = baseZNode.length() + 1;
return path.length() > prefixLen && isMetaZNodePrefix(path.substring(prefixLen));
}
/**
* Returns whether the path is supposed to be readable by the client and DOES NOT contain
* sensitive information (world readable).
*/
public boolean isClientReadable(String path) {
// Developer notice: These znodes are world readable. DO NOT add more znodes here UNLESS
// all clients need to access this data to work. Using zk for sharing data to clients (other
// than service lookup case is not a recommended design pattern.
return path.equals(baseZNode) || isMetaZNodePath(path) || path.equals(masterAddressZNode)
|| path.equals(clusterIdZNode) || path.equals(rsZNode) ||
// /hbase/table and /hbase/table/foo is allowed, /hbase/table-lock is not
path.equals(tableZNode) || path.startsWith(tableZNode + "/");
}
public String getRsPath(ServerName sn) {
return joinZNode(rsZNode, sn.toString());
}
/**
* Join the prefix znode name with the suffix znode name to generate a proper full znode name.
*
* Assumes prefix does not end with slash and suffix does not begin with it.
* @param prefix beginning of znode name
* @param suffix ending of znode name
* @return result of properly joining prefix with suffix
*/
public static String joinZNode(String prefix, String suffix) {
return prefix + ZNodePaths.ZNODE_PATH_SEPARATOR + suffix;
}
}