HBASE-23 UI listing regions should be sorted by address and show additional region state
M src/java/org/apache/hadoop/hbase/HServerLoad.java
(toString): Overload that takes interval.
M src/java/org/apache/hadoop/hbase/regionserver/HRegionServer.java
(getConfiguration): Added
M src/java/org/apache/hadoop/hbase/master/HMaster.java
(getAverageLoad): Added
M src/java/org/apache/hadoop/hbase/HServerAddress.java
(getHostname): Added.
M src/java/org/apache/hadoop/hbase/client/HTable.java
(getRegionsInfo): Added.
M src/webapps/regionserver/regionserver.jsp
M src/webapps/master/master.jsp
Output requests as requests per second.
Fixed up the help comments. Changed all to use new getHostname
rather than IPs. Added encoded name column.
M src/webapps/master/table.jsp
Added.
M src/webapps/master/WEB-INF/web.xml
Add new tables servlet.
M bin/hbase
Put hbase in front of hadoop again. FIxes not being able to find
stylesheets -- might break logging again though doesnt seem to in
tests.
git-svn-id: https://svn.apache.org/repos/asf/hadoop/hbase/trunk@656366 13f79535-47bb-0310-9956-ffa450edef68
This commit is contained in:
Michael Stack
parent
595b75b105
commit
822ba8bc3b
15
bin/hbase
15
bin/hbase
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@ -103,14 +103,6 @@ IFS=
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# CLASSPATH initially contains $HBASE_CONF_DIR
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CLASSPATH="${HBASE_CONF_DIR}"
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# Add libs to CLASSPATH
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# Do this early so hadoop jar comes before hbase classes; otherwise
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# complaint because way webapps are loaded, expectation is that
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# loading class is from same jar as webapps themselves (only true
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# if hadoop comes first).
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for f in $HBASE_HOME/lib/*.jar; do
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CLASSPATH=${CLASSPATH}:$f;
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done
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CLASSPATH=${CLASSPATH}:$JAVA_HOME/lib/tools.jar
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@ -125,7 +117,7 @@ if [ -d "$HBASE_HOME/build/webapps" ]; then
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CLASSPATH=${CLASSPATH}:$HBASE_HOME/build
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fi
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# for releases, add hbase, hadoop & webapps to CLASSPATH
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# for releases, add hbase & webapps to CLASSPATH
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for f in $HBASE_HOME/hbase*.jar; do
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if [ -f $f ]; then
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CLASSPATH=${CLASSPATH}:$f;
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@ -135,6 +127,11 @@ if [ -d "$HBASE_HOME/webapps" ]; then
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CLASSPATH=${CLASSPATH}:$HBASE_HOME
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fi
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# Add libs to CLASSPATH
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for f in $HBASE_HOME/lib/*.jar; do
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CLASSPATH=${CLASSPATH}:$f;
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done
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for f in $HBASE_HOME/lib/jetty-ext/*.jar; do
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CLASSPATH=${CLASSPATH}:$f;
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done
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@ -89,7 +89,7 @@ public class HServerAddress implements WritableComparable {
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stringValue = bindAddress + ":" + port;
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}
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/** @return host name */
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/** @return bind address */
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public String getBindAddress() {
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return address.getAddress().getHostAddress();
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}
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@ -99,6 +99,11 @@ public class HServerAddress implements WritableComparable {
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return address.getPort();
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}
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/** @return host name */
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public String getHostname() {
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return address.getHostName();
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}
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/** @return the InetSocketAddress */
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public InetSocketAddress getInetSocketAddress() {
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return address;
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@ -70,7 +70,16 @@ public class HServerLoad implements WritableComparable {
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/** {@inheritDoc} */
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@Override
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public String toString() {
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return "requests: " + numberOfRequests + " regions: " + numberOfRegions;
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return toString(1);
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}
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/**
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* Returns toString() with the number of requests divided by the message interval in seconds
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* @param msgInterval
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* @return The load as a String
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*/
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public String toString(int msgInterval) {
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return "requests: " + numberOfRequests/msgInterval + " regions: " + numberOfRegions;
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}
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/** {@inheritDoc} */
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@ -21,6 +21,7 @@ package org.apache.hadoop.hbase.client;
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import java.io.IOException;
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import java.util.ArrayList;
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import java.util.HashMap;
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import java.util.Iterator;
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import java.util.List;
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import java.util.Map;
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@ -32,6 +33,7 @@ import org.apache.hadoop.hbase.HBaseConfiguration;
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import org.apache.hadoop.hbase.HConstants;
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import org.apache.hadoop.hbase.HRegionInfo;
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import org.apache.hadoop.hbase.HRegionLocation;
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import org.apache.hadoop.hbase.HServerAddress;
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import org.apache.hadoop.hbase.HTableDescriptor;
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import org.apache.hadoop.hbase.filter.RowFilterInterface;
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import org.apache.hadoop.hbase.filter.StopRowFilter;
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@ -176,12 +178,75 @@ public class HTable implements HConstants {
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}
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} while (startRow.compareTo(EMPTY_START_ROW) != 0);
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Text[] arr = new Text[keyList.size()];
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for (int i = 0; i < keyList.size(); i++ ){
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arr[i] = keyList.get(i);
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return keyList.toArray(new Text[keyList.size()]);
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}
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return arr;
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/**
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* Get all the regions and their address for this table
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* @return A map of HRegionInfo with it's server address
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* @throws IOException
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*/
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@SuppressWarnings("null")
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public Map<HRegionInfo, HServerAddress> getRegionsInfo() throws IOException {
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// TODO This code is a near exact copy of getStartKeys. To be refactored HBASE-626
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HashMap<HRegionInfo, HServerAddress> regionMap = new HashMap<HRegionInfo, HServerAddress>();
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long scannerId = -1L;
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Text startRow = new Text(tableName.toString() + ",,999999999999999");
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HRegionLocation metaLocation = null;
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HRegionInterface server;
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// scan over the each meta region
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do {
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try{
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// turn the start row into a location
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metaLocation =
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connection.locateRegion(META_TABLE_NAME, startRow);
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// connect to the server hosting the .META. region
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server =
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connection.getHRegionConnection(metaLocation.getServerAddress());
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// open a scanner over the meta region
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scannerId = server.openScanner(
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metaLocation.getRegionInfo().getRegionName(),
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new Text[]{COL_REGIONINFO}, tableName, LATEST_TIMESTAMP,
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null);
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// iterate through the scanner, accumulating regions and their regionserver
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while (true) {
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RowResult values = server.next(scannerId);
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if (values == null || values.size() == 0) {
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break;
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}
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HRegionInfo info = new HRegionInfo();
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info = (HRegionInfo) Writables.getWritable(
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values.get(COL_REGIONINFO).getValue(), info);
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if (!info.getTableDesc().getName().equals(this.tableName)) {
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break;
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}
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if (info.isOffline() || info.isSplit()) {
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continue;
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}
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regionMap.put(info, metaLocation.getServerAddress());
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}
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// close that remote scanner
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server.close(scannerId);
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// advance the startRow to the end key of the current region
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startRow = metaLocation.getRegionInfo().getEndKey();
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} catch (IOException e) {
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// need retry logic?
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throw e;
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}
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} while (startRow.compareTo(EMPTY_START_ROW) != 0);
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return regionMap;
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}
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/**
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@ -302,6 +302,11 @@ public class HMaster extends Thread implements HConstants, HMasterInterface,
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return serverManager.getServersToLoad();
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}
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/** @return The average load */
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public double getAverageLoad() {
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return serverManager.getAverageLoad();
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}
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/**
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* @return Location of the <code>-ROOT-</code> region.
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*/
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@ -1267,6 +1267,14 @@ public class HRegionServer implements HConstants, HRegionInterface, Runnable {
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return stopRequested.get();
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}
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/**
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*
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* @return the configuration
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*/
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public HBaseConfiguration getConfiguration() {
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return conf;
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}
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/** @return the write lock for the server */
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ReentrantReadWriteLock.WriteLock getWriteLock() {
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return lock.writeLock();
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@ -9,6 +9,11 @@ Automatically created by Tomcat JspC.
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<web-app>
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<servlet>
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<servlet-name>org.apache.hadoop.hbase.generated.master.table_jsp</servlet-name>
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<servlet-class>org.apache.hadoop.hbase.generated.master.table_jsp</servlet-class>
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</servlet>
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<servlet>
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<servlet-name>org.apache.hadoop.hbase.generated.master.hql_jsp</servlet-name>
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<servlet-class>org.apache.hadoop.hbase.generated.master.hql_jsp</servlet-class>
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@ -19,6 +24,11 @@ Automatically created by Tomcat JspC.
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<servlet-class>org.apache.hadoop.hbase.generated.master.master_jsp</servlet-class>
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</servlet>
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<servlet-mapping>
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<servlet-name>org.apache.hadoop.hbase.generated.master.table_jsp</servlet-name>
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<url-pattern>/table.jsp</url-pattern>
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</servlet-mapping>
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<servlet-mapping>
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<servlet-name>org.apache.hadoop.hbase.generated.master.hql_jsp</servlet-name>
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<url-pattern>/hql.jsp</url-pattern>
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@ -15,26 +15,24 @@
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import="org.apache.hadoop.hbase.HTableDescriptor" %><%
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HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
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HBaseConfiguration conf = master.getConfiguration();
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TableFormatter formatter = new HtmlTableFormatter(out);
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ShowCommand show = new ShowCommand(out, formatter, "tables");
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HServerAddress rootLocation = master.getRootRegionLocation();
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Map<Text, MetaRegion> onlineRegions = master.getOnlineMetaRegions();
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Map<String, HServerInfo> serverToServerInfos =
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master.getServersToServerInfo();
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int interval = conf.getInt("hbase.regionserver.msginterval", 6000)/1000;
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int interval = conf.getInt("hbase.regionserver.msginterval", 3000)/1000;
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%><?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
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<title>HBase Master: <%= master.getMasterAddress()%></title>
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<title>HBase Master: <%= master.getMasterAddress().getHostname()%>:<%= master.getMasterAddress().getPort() %></title>
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<link rel="stylesheet" type="text/css" href="/static/hbase.css" />
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</head>
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<body>
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<a id="logo" href="http://wiki.apache.org/lucene-hadoop/Hbase"><img src="/static/hbase_logo_med.gif" alt="HBase Logo" title="HBase Logo" /></a>
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<h1 id="page_title">Master: <%=master.getMasterAddress()%></h1>
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<h1 id="page_title">Master: <%=master.getMasterAddress().getHostname()%>:<%=master.getMasterAddress().getPort()%></h1>
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<p id="links_menu"><a href="/hql.jsp">HQL</a>, <a href="/logs/">Local logs</a>, <a href="/stacks">Thread Dump</a>, <a href="/logLevel">Log Level</a></p>
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<hr id="head_rule" />
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@ -47,27 +45,34 @@
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<tr><td>Hadoop Compiled</td><td><%= org.apache.hadoop.util.VersionInfo.getDate() %>, <%= org.apache.hadoop.util.VersionInfo.getUser() %></td><td>When Hadoop version was compiled and by whom</td></tr>
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<tr><td>Filesystem</td><td><%= conf.get("fs.default.name") %></td><td>Filesystem HBase is running on</td></tr>
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<tr><td>HBase Root Directory</td><td><%= master.getRootDir().toString() %></td><td>Location of HBase home directory</td></tr>
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<tr><td>Load average</td><td><%= master.getAverageLoad() %></td><td>Average load across all region servers. Naive computation.</td></tr>
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</table>
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<h2>Online META Regions</h2>
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<% if (rootLocation != null) { %>
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<h2>Catalog Tables</h2>
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<%
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if (rootLocation != null) { %>
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<table>
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<tr><th>Name</th><th>Server</th></tr>
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<tr><td><%= HConstants.ROOT_TABLE_NAME.toString() %></td><td><%= rootLocation.toString() %></td></tr>
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<tr><th>Table</th><th>Description</th></tr>
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<tr><td><a href=/table.jsp?name=<%= HConstants.ROOT_TABLE_NAME.toString() %>><%= HConstants.ROOT_TABLE_NAME.toString() %></a></td><td>The -ROOT- table holds references to all .META. regions.</td></tr>
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<%
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if (onlineRegions != null && onlineRegions.size() > 0) { %>
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<% for (Map.Entry<Text, MetaRegion> e: onlineRegions.entrySet()) {
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MetaRegion meta = e.getValue();
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%>
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<tr><td><%= meta.getRegionName().toString() %></td><td><%= meta.getServer().toString() %></td></tr>
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<% }
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} %>
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<tr><td><a href=/table.jsp?name=<%= HConstants.META_TABLE_NAME.toString() %>><%= HConstants.META_TABLE_NAME.toString() %></a></td><td>The .META. table holds references to all User Table regions</td></tr>
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<% } %>
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</table>
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<%} %>
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<h2>Tables</h2>
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<% ReturnMsg msg = show.execute(conf); %>
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<p><%=msg %></p>
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<h2>User Tables</h2>
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<% HTableDescriptor[] tables = new HBaseAdmin(conf).listTables();
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if(tables != null && tables.length > 0) { %>
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<table>
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<tr><th>Table</th><th>Description</th></tr>
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<% for(HTableDescriptor htDesc : tables ) { %>
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<tr><td><a href=/table.jsp?name=<%= htDesc.getName() %>><%= htDesc.getName() %></a> </td><td><%= htDesc.toString() %></td></tr>
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<% } %>
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<p> <%= tables.length %> table(s) in set.</p>
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</table>
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<% } %>
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<h2>Region Servers</h2>
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<% if (serverToServerInfos != null && serverToServerInfos.size() > 0) { %>
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@ -77,24 +82,24 @@
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<table>
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<tr><th rowspan=<%= serverToServerInfos.size() + 1%>></th><th>Address</th><th>Start Code</th><th>Load</th></tr>
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<% for (Map.Entry<String, HServerInfo> e: serverToServerInfos.entrySet()) {
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HServerInfo hsi = e.getValue();
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<% String[] serverNames = serverToServerInfos.keySet().toArray(new String[serverToServerInfos.size()]);
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Arrays.sort(serverNames);
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for (String serverName: serverNames) {
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HServerInfo hsi = serverToServerInfos.get(serverName);
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String url = "http://" +
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hsi.getServerAddress().getBindAddress().toString() + ":" +
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hsi.getServerAddress().getHostname().toString() + ":" +
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hsi.getInfoPort() + "/";
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String load = hsi.getLoad().toString();
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String hostname = hsi.getServerAddress().getHostname() + ":" + hsi.getServerAddress().getPort();
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totalRegions += hsi.getLoad().getNumberOfRegions();
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totalRequests += hsi.getLoad().getNumberOfRequests();
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totalRequests += hsi.getLoad().getNumberOfRequests() / interval;
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long startCode = hsi.getStartCode();
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String address = hsi.getServerAddress().toString();
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%>
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<tr><td><a href="<%= url %>"><%= address %></a></td><td><%= startCode %></td><td><%= load %></td></tr>
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<tr><td><a href="<%= url %>"><%= hostname %></a></td><td><%= startCode %></td><td><%= hsi.getLoad().toString(interval) %></td></tr>
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<% } %>
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<tr><th>Total: </th><td>servers: <%= serverToServerInfos.size() %></td><td> </td><td>requests: <%= totalRequests %> regions: <%= totalRegions %></td></tr>
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</table>
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<p>Load is requests per <em>hbase.regionsserver.msginterval</em> (<%=interval%> second(s)) and count of regions loaded</p>
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<p>Load is requests per second and count of regions loaded</p>
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<% } %>
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</body>
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</html>
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@ -0,0 +1,72 @@
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<%@ page contentType="text/html;charset=UTF-8"
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import="org.apache.hadoop.io.Text"
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import="org.apache.hadoop.hbase.HTableDescriptor"
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import="org.apache.hadoop.hbase.client.HTable"
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import="org.apache.hadoop.hbase.HRegionInfo"
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import="org.apache.hadoop.hbase.HServerAddress"
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import="org.apache.hadoop.hbase.HServerInfo"
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import="org.apache.hadoop.hbase.master.HMaster"
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import="org.apache.hadoop.hbase.master.MetaRegion"
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import="java.io.IOException"
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import="java.util.Map"
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import="org.apache.hadoop.hbase.HConstants"%><%
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HMaster master = (HMaster)getServletContext().getAttribute(HMaster.MASTER);
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String tableName = request.getParameter("name");
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HTable table = new HTable(master.getConfiguration(), new Text(tableName));
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Map<String, HServerInfo> serverToServerInfos =
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master.getServersToServerInfo();
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String tableHeader = "<table><tr><th>Name</th><th>Region Server</th><th>Encoded Name</th><th>Start Key</th><th>End Key</th></tr>";
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HServerAddress rootLocation = master.getRootRegionLocation();
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%><?xml version="1.0" encoding="UTF-8" ?>
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
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"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
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<title>Regions in <%= tableName %></title>
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<link rel="stylesheet" type="text/css" href="/static/hbase.css" />
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</head>
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<body>
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<a id="logo" href="http://wiki.apache.org/lucene-hadoop/Hbase"><img src="/static/hbase_logo_med.gif" alt="HBase Logo" title="HBase Logo" /></a>
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<h1 id="page_title">Regions in <%= tableName %></h1>
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<p id="links_menu"><a href="/master.jsp">Master</a>, <a href="/logs/">Local logs</a>, <a href="/stacks">Thread Dump</a>, <a href="/logLevel">Log Level</a></p>
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<hr id="head_rule" />
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||||
|
||||
<%if(tableName.equals(HConstants.ROOT_TABLE_NAME.toString())) {%>
|
||||
<%= tableHeader %>
|
||||
<% int infoPort = serverToServerInfos.get(rootLocation.getBindAddress()+":"+rootLocation.getPort()).getInfoPort();
|
||||
String url = "http://" + rootLocation.getBindAddress() + ":" + infoPort + "/";%>
|
||||
<tr><td><%= tableName %></td><td><a href="<%= url %>"><%= rootLocation.getHostname() %>:<%= rootLocation.getPort() %></a></td><td>-</td><td></td><td>-</td></tr>
|
||||
</table>
|
||||
<%} else if(tableName.equals(HConstants.META_TABLE_NAME.toString())) { %>
|
||||
<%= tableHeader %>
|
||||
<% Map<Text, MetaRegion> onlineRegions = master.getOnlineMetaRegions();
|
||||
for (MetaRegion meta: onlineRegions.values()) {
|
||||
int infoPort = serverToServerInfos.get(meta.getServer().getBindAddress()+":"+meta.getServer().getPort()).getInfoPort();
|
||||
String url = "http://" + meta.getServer().getHostname() + ":" + infoPort + "/";%>
|
||||
<tr><td><%= meta.getRegionName() %></td><td><a href="<%= url %>"><%= meta.getServer().getHostname() %>:<%= meta.getServer().getPort() %></a></td><td>-</td><td><%= meta.getStartKey() %></td><td>-</td></tr>
|
||||
<% } %>
|
||||
</table>
|
||||
<%} else { %>
|
||||
|
||||
<%
|
||||
try {
|
||||
Map<HRegionInfo, HServerAddress> regions = table.getRegionsInfo();
|
||||
if(regions != null && regions.size() > 0) { %>
|
||||
<%= tableHeader %>
|
||||
<% for(Map.Entry<HRegionInfo, HServerAddress> hriEntry : regions.entrySet()) { %>
|
||||
<% System.out.println(serverToServerInfos.keySet().toArray()[0].toString());
|
||||
System.out.println(hriEntry.getValue().getHostname()+":"+hriEntry.getValue().getPort());
|
||||
int infoPort = serverToServerInfos.get(hriEntry.getValue().getHostname()+":"+hriEntry.getValue().getPort()).getInfoPort();
|
||||
String url = "http://" + hriEntry.getValue().getHostname().toString() + ":" + infoPort + "/"; %>
|
||||
<tr><td><%= hriEntry.getKey().getRegionName()%></td><td><a href="<%= url %>"><%= hriEntry.getValue().getHostname() %>:<%= hriEntry.getValue().getPort() %></a></td>
|
||||
<td><%= hriEntry.getKey().getEncodedName()%></td> <td><%= hriEntry.getKey().getStartKey()%></td>
|
||||
<td><%= hriEntry.getKey().getEndKey()%></td></tr>
|
||||
<% } %>
|
||||
</table>
|
||||
<% }
|
||||
}
|
||||
catch(IOException ioe) { }
|
||||
}%>
|
||||
</body>
|
||||
</html>
|
||||
|
|
@ -9,18 +9,19 @@
|
|||
HRegionServer regionServer = (HRegionServer)getServletContext().getAttribute(HRegionServer.REGIONSERVER);
|
||||
HServerInfo serverInfo = regionServer.getServerInfo();
|
||||
Map<Text, HRegion> onlineRegions = regionServer.getOnlineRegions();
|
||||
int interval = regionServer.getConfiguration().getInt("hbase.regionserver.msginterval", 3000)/1000;
|
||||
%><?xml version="1.0" encoding="UTF-8" ?>
|
||||
<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN"
|
||||
"http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
|
||||
<html xmlns="http://www.w3.org/1999/xhtml">
|
||||
<head><meta http-equiv="Content-Type" content="text/html;charset=UTF-8"/>
|
||||
<title>HBase Region Server: <%= serverInfo.getServerAddress().toString() %></title>
|
||||
<title>HBase Region Server: <%= serverInfo.getServerAddress().getHostname() %>:<%= serverInfo.getServerAddress().getPort() %></title>
|
||||
<link rel="stylesheet" type="text/css" href="/static/hbase.css" />
|
||||
</head>
|
||||
|
||||
<body>
|
||||
<a id="logo" href="http://wiki.apache.org/lucene-hadoop/Hbase"><img src="/static/hbase_logo_med.gif" alt="HBase Logo" title="HBase Logo" /></a>
|
||||
<h1 id="page_title">Region Server: <%= serverInfo.getServerAddress().toString() %></h1>
|
||||
<h1 id="page_title">Region Server: <%= serverInfo.getServerAddress().getHostname() %>:<%= serverInfo.getServerAddress().getPort() %></h1>
|
||||
<p id="links_menu"><a href="/logs/">Local logs</a>, <a href="/stacks">Thread Dump</a>, <a href="/logLevel">Log Level</a></p>
|
||||
<hr id="head_rule" />
|
||||
|
||||
|
|
@ -29,15 +30,16 @@
|
|||
<tr><th>Attribute Name</th><th>Value</th><th>Description</th></tr>
|
||||
<tr><td>HBase Version</td><td><%= org.apache.hadoop.hbase.util.VersionInfo.getVersion() %>, r<%= org.apache.hadoop.hbase.util.VersionInfo.getRevision() %></td><td>HBase version and svn revision</td></tr>
|
||||
<tr><td>HBase Compiled</td><td><%= org.apache.hadoop.hbase.util.VersionInfo.getDate() %>, <%= org.apache.hadoop.hbase.util.VersionInfo.getUser() %></td><td>When HBase version was compiled and by whom</td></tr>
|
||||
<tr><td>Load</td><td><%= serverInfo.getLoad().toString() %></td><td>Requests/<em>hbase.regionserver.msginterval</em> + count of loaded regions</td></tr>
|
||||
<tr><td>Load</td><td><%= serverInfo.getLoad().toString(interval) %></td><td>Requests per second and count of loaded regions</td></tr>
|
||||
</table>
|
||||
|
||||
<h2>Online Regions</h2>
|
||||
<% if (onlineRegions != null && onlineRegions.size() > 0) { %>
|
||||
<table>
|
||||
<tr><th>Region Name</th><th>Start Key</th><th>End Key</th></tr>
|
||||
<tr><th>Region Name</th><th>Encoded Name</th><th>Start Key</th><th>End Key</th></tr>
|
||||
<% for (HRegion r: onlineRegions.values()) { %>
|
||||
<tr><td><%= r.getRegionName().toString() %></td><td><%= r.getStartKey().toString() %></td><td><%= r.getEndKey().toString() %></td></tr>
|
||||
<tr><td><%= r.getRegionName().toString() %></td><td><%= r.getRegionInfo().getEncodedName() %></td>
|
||||
<td><%= r.getStartKey().toString() %></td><td><%= r.getEndKey().toString() %></td></tr>
|
||||
<% } %>
|
||||
</table>
|
||||
<p>Region names are made of the containing table's name, a comma,
|
||||
|
|
@ -46,14 +48,12 @@ the region named
|
|||
<em>domains,apache.org,5464829424211263407</em> is party to the table
|
||||
<em>domains</em>, has an id of <em>5464829424211263407</em> and the first key
|
||||
in the region is <em>apache.org</em>. The <em>-ROOT-</em>
|
||||
and <em>.META.</em> 'tables' are internal sytem tables.
|
||||
and <em>.META.</em> 'tables' are internal sytem tables (or 'catalog' tables in db-speak).
|
||||
The -ROOT- keeps a list of all regions in the .META. table. The .META. table
|
||||
keeps a list of all regions in the system. The empty key is used to denote
|
||||
table start and table end. A region with an
|
||||
empty start key is the first region in a table. If region has both an empty
|
||||
start and an empty end key, its the only region in the table. See
|
||||
<a href="http://wiki.apache.org/lucene-hadoop/Hbase">HBase Home</a> for
|
||||
further explication.<p>
|
||||
table start and table end. A region with an empty start key is the first region in a table.
|
||||
If region has both an empty start and an empty end key, its the only region in the table. See
|
||||
<a href="http://hbase.org">HBase Home</a> for further explication.<p>
|
||||
<% } else { %>
|
||||
<p>Not serving regions</p>
|
||||
<% } %>
|
||||
|
|
|
|||
Loading…
Reference in New Issue