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See:
Description
Interface Summary | |
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ReplicationEndpoint | ReplicationEndpoint is a plugin which implements replication to other HBase clusters, or other systems. |
ReplicationListener | The replication listener interface can be implemented if a class needs to subscribe to events generated by the ReplicationTracker. |
ReplicationPeer | ReplicationPeer manages enabled / disabled state for the peer. |
ReplicationPeers | This provides an interface for maintaining a set of peer clusters. |
ReplicationQueues | This provides an interface for maintaining a region server's replication queues. |
ReplicationQueuesClient | This provides an interface for clients of replication to view replication queues. |
ReplicationTracker | This is the interface for a Replication Tracker. |
WALEntryFilter | A Filter for WAL entries before being sent over to replication. |
Class Summary | |
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BaseReplicationEndpoint | A Base implementation for ReplicationEndpoint s. |
ChainWALEntryFilter | A WALEntryFilter which contains multiple filters and applies them
in chain order |
HBaseReplicationEndpoint | A BaseReplicationEndpoint for replication endpoints whose
target cluster is an HBase cluster. |
HBaseReplicationEndpoint.PeerRegionServerListener | Tracks changes to the list of region servers in a peer's cluster. |
ReplicationEndpoint.Context | |
ReplicationEndpoint.ReplicateContext | A context for ReplicationEndpoint.replicate(ReplicateContext) method. |
ReplicationFactory | A factory class for instantiating replication objects that deal with replication state. |
ReplicationLoadSink | A HBase ReplicationLoad to present MetricsSink information |
ReplicationLoadSource | A HBase ReplicationLoad to present MetricsSource information |
ReplicationPeerConfig | A configuration for the replication peer cluster. |
ReplicationPeersZKImpl | This class provides an implementation of the ReplicationPeers interface using Zookeeper. |
ReplicationPeerZKImpl | |
ReplicationQueueInfo | This class is responsible for the parsing logic for a znode representing a queue. |
ReplicationQueuesClientZKImpl | |
ReplicationQueuesZKImpl | This class provides an implementation of the ReplicationQueues interface using Zookeeper. |
ReplicationStateZKBase | This is a base class for maintaining replication state in zookeeper. |
ReplicationTrackerZKImpl | This class is a Zookeeper implementation of the ReplicationTracker interface. |
ScopeWALEntryFilter | Keeps KVs that are scoped other than local |
SystemTableWALEntryFilter | Skips WAL edits for all System tables including META |
TableCfWALEntryFilter |
Enum Summary | |
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ReplicationPeer.PeerState | State of the peer, whether it is enabled or not |
Exception Summary | |
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ReplicationException | An HBase Replication exception. |
This package is experimental quality software and is only meant to be a base for future developments. The current implementation offers the following features:
Before trying out replication, make sure to review the following requirements:
The following steps describe how to enable replication from a cluster to another.
<property> <name>hbase.replication</name> <value>true</value> </property>deploy the files, and then restart HBase if it was running.
add_peerThis will show you the help to setup the replication stream between both clusters. If both clusters use the same Zookeeper cluster, you have to use a different zookeeper.znode.parent since they can't write in the same folder.
disable 'your_table' alter 'your_table', {NAME => 'family_name', REPLICATION_SCOPE => '1'} enable 'your_table'Currently, a scope of 0 (default) means that it won't be replicated and a scope of 1 means it's going to be. In the future, different scope can be used for routing policies.
list_peers(as of version 0.92)
Considering 1 rs, with ratio 0.1 Getting 1 rs from peer cluster # 0 Choosing peer 10.10.1.49:62020In this case it indicates that 1 region server from the slave cluster was chosen for replication.
Verifying the replicated data on two clusters is easy to do in the shell when looking only at a few rows, but doing a systematic comparison requires more computing power. This is why the VerifyReplication MR job was created, it has to be run on the master cluster and needs to be provided with a peer id (the one provided when establishing a replication stream) and a table name. Other options let you specify a time range and specific families. This job's short name is "verifyrep" and needs to be provided when pointing "hadoop jar" to the hbase jar.
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