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See:
Description
Interface Summary | |
---|---|
HConnection | |
HConstants | HConstants holds a bunch of HBase-related constants |
HInternalScannerInterface | Internally, we need to be able to determine if the scanner is doing wildcard column matches (when only a column family is specified or if a column regex is specified) or if multiple members of the same column family were specified. |
HMasterInterface | Clients interact with the HMasterInterface to gain access to meta-level HBase functionality, like finding an HRegionServer and creating/destroying tables. |
HMasterRegionInterface | HRegionServers interact with the HMasterRegionInterface to report on local goings-on and to obtain data-handling instructions from the HMaster. |
HRegionInterface | Clients interact with HRegionServers using a handle to the HRegionInterface. |
HScannerInterface | HScannerInterface iterates through a set of rows. |
LeaseListener | LeaseListener is an interface meant to be implemented by users of the Leases class. |
RegionUnavailableListener | Used as a callback mechanism so that an HRegion can notify the HRegionServer of the different stages making an HRegion unavailable. |
Class Summary | |
---|---|
BloomFilterDescriptor | Supplied as a parameter to HColumnDescriptor to specify what kind of bloom filter to use for a column, and its configuration parameters. |
Chore | Chore is a task performed on a period in hbase. |
HAbstractScanner | Abstract base class that implements the HScannerInterface. |
HBaseAdmin | Provides administrative functions for HBase |
HBaseConfiguration | Adds HBase configuration files to a Configuration |
HColumnDescriptor | An HColumnDescriptor contains information about a column family such as the number of versions, compression settings, etc. |
HConnectionManager | A non-instantiable class that manages connections to multiple tables in multiple HBase instances |
HGlobals | Global values that require initialization that cannot be done in HConstants |
HLocking | HLocking is a set of lock primitives that does not rely on a particular thread holding the monitor for an object. |
HLog | HLog stores all the edits to the HStore. |
HLogEdit | A log value. |
HLogKey | A Key for an entry in the change log. |
HMaster | HMaster is the "master server" for a HBase. |
HMaster.MetaRegion | |
HMemcache | The HMemcache holds in-memory modifications to the HRegion. |
HMsg | HMsg is for communicating instructions between the HMaster and the HRegionServers. |
HRegion | HRegion stores data for a certain region of a table. |
HRegionInfo | HRegion information. |
HRegionLocation | Contains the HRegionInfo for the region and the HServerAddress for the HRegionServer serving the region |
HRegionServer | HRegionServer makes a set of HRegions available to clients. |
HServerAddress | HServerAddress is a "label" for a HBase server that combines the host name and port number. |
HServerInfo | HServerInfo contains metainfo about an HRegionServer, Currently it only contains the server start code. |
HServerLoad | This class encapsulates metrics for determining the load on a HRegionServer |
HStoreFile | A HStore data file. |
HStoreKey | A Key for a stored row |
HTable | Used to communicate with a single HBase table |
HTableDescriptor | HTableDescriptor contains the name of an HTable, and its column families. |
Leases | Leases There are several server classes in HBase that need to track external clients that occasionally send heartbeats. |
RemoteExceptionHandler | An immutable class which contains a static method for handling org.apache.hadoop.ipc.RemoteException exceptions. |
Shell | An hbase shell. |
Enum Summary | |
---|---|
BloomFilterDescriptor.BloomFilterType | The type of bloom filter |
HColumnDescriptor.CompressionType | The type of compression. |
HStoreFile.Range | For split HStoreFiles, specifies if the file covers the lower half or the upper half of the key range |
Exception Summary | |
---|---|
DroppedSnapshotException | Thrown during flush if the possibility snapshot content was not properly persisted into store files. |
InvalidColumnNameException | Thrown when an invalid column name is encountered |
LockException | Thrown when a locking error is encountered |
MasterNotRunningException | Thrown if the master is not running |
NoServerForRegionException | Thrown when no region server can be found for a region |
NotServingRegionException | Thrown by a region server if it is sent a request for a region it is not serving. |
RegionServerRunningException | Thrown if the region server log directory exists (which indicates another region server is running at the same address) |
TableExistsException | Thrown when a table exists but should not |
TableNotDisabledException | Thrown if a table should be offline but is not |
TableNotFoundException | Thrown when a table can not be located |
UnknownScannerException | Thrown if a region server is passed an unknown scanner id |
WrongRegionException | Thrown when a request contains a key which is not part of this region |
Provides HBase, the Hadoop simple database.
JAVA_HOME
to the root of your Java installation when configuring Hadoop.
Start by defining the following directory variables for your convenience:
${HADOOP_HOME}
: The root directory of your Hadoop installation.${HBASE_HOME}
: The HBase root, located at
${HADOOP_HOME}/src/contrib/hbase
.If you are running a standalone operation, proceed to Running and Confirming Your Installation. If you are running a distributed operation, continue below.
Make sure you have followed
Hadoop's instructions for running a distributed operation.
Configuring HBase for a distributed operation requires modification of the following two
files: ${HBASE_HOME}/conf/hbase-site.xml
and
${HBASE_HOME}/conf/regionservers
.
hbase-site.xml
allows the user to override the properties defined in
${HBASE_HOME}/conf/hbase-default.xml
. hbase-default.xml
itself
should never be modified. At a minimum the hbase.master
property should be redefined
in hbase-site.xml
to define the host:port
pair on which to run the
HMaster (read about the
HBase master, regionservers, etc):
<configuration> <property> <name>hbase.master</name> <value>[YOUR_HOST]:[PORT]</value> <description>The host and port that the HBase master runs at. </description> </property> </configuration>
The regionserver
file lists all the hosts running HRegionServers, one
host per line (This file is synonymous to the slaves file at
${HADOOP_HOME}/conf/slaves
).
${HBASE_HOME}/conf/hbase-env.sh
.If you are running a distributed operation you will need to start the Hadoop daemons before starting HBase and stop the daemons after HBase has shut down. Start and stop the Hadoop daemons as per the Hadoop instructions. Afterwards, or if running a standalone operation, start HBase with the following command:
${HBASE_HOME}/bin/start-hbase.sh
Once HBase has started, enter ${HBASE_HOME}/bin/hbase shell
to obtain a
shell against HBase from which you can execute HBase commands. In the HBase shell, type
help;
to see a list of supported commands. Note that all commands in the HBase
shell must end with ;
. Test your installation by creating, viewing, and dropping
a table, as per the help instructions. Be patient with the create
and
drop
operations as they may each take 10 seconds or more. To stop hbase, exit the
HBase shell and enter:
${HBASE_HOME}/bin/stop-hbase.sh
If you are running a distributed operation, be sure to wait until HBase has shut down completely before stopping the Hadoop daemons.
The default location for logs is ${HADOOP_HOME}/logs
.
HBase also puts up a UI listing vital attributes. By default its deployed on the master host at port 60010.
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