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Server functionality for HBase
/*
* Licensed to the Apache Software Foundation (ASF) under one or more
* contributor license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright ownership.
* The ASF licenses this file to you under the Apache License, Version 2.0
* (the "License"); you may not use this file except in compliance with
* the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.apache.hadoop.hbase.quotas;
import java.io.IOException;
import java.util.HashMap;
import java.util.Map;
import java.util.Map.Entry;
import java.util.concurrent.TimeUnit;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.hbase.ScheduledChore;
import org.apache.hadoop.hbase.TableName;
import org.apache.yetus.audience.InterfaceAudience;
import org.apache.hadoop.hbase.client.Connection;
import org.apache.hadoop.hbase.client.Result;
import org.apache.hadoop.hbase.client.ResultScanner;
import org.apache.hadoop.hbase.client.Table;
import org.apache.hadoop.hbase.util.Bytes;
/**
* A {@link ScheduledChore} which periodically updates the {@link RegionServerSpaceQuotaManager}
* with information from the hbase:quota.
*/
@InterfaceAudience.Private
public class SpaceQuotaRefresherChore extends ScheduledChore {
private static final Log LOG = LogFactory.getLog(SpaceQuotaRefresherChore.class);
static final String POLICY_REFRESHER_CHORE_PERIOD_KEY =
"hbase.regionserver.quotas.policy.refresher.chore.period";
static final int POLICY_REFRESHER_CHORE_PERIOD_DEFAULT = 1000 * 60 * 1; // 1 minute in millis
static final String POLICY_REFRESHER_CHORE_DELAY_KEY =
"hbase.regionserver.quotas.policy.refresher.chore.delay";
static final long POLICY_REFRESHER_CHORE_DELAY_DEFAULT = 1000L * 15L; // 15 seconds in millis
static final String POLICY_REFRESHER_CHORE_TIMEUNIT_KEY =
"hbase.regionserver.quotas.policy.refresher.chore.timeunit";
static final String POLICY_REFRESHER_CHORE_TIMEUNIT_DEFAULT = TimeUnit.MILLISECONDS.name();
static final String POLICY_REFRESHER_CHORE_REPORT_PERCENT_KEY =
"hbase.regionserver.quotas.policy.refresher.report.percent";
static final double POLICY_REFRESHER_CHORE_REPORT_PERCENT_DEFAULT= 0.95;
private final RegionServerSpaceQuotaManager manager;
private final Connection conn;
public SpaceQuotaRefresherChore(RegionServerSpaceQuotaManager manager, Connection conn) {
super(SpaceQuotaRefresherChore.class.getSimpleName(),
manager.getRegionServerServices(),
getPeriod(manager.getRegionServerServices().getConfiguration()),
getInitialDelay(manager.getRegionServerServices().getConfiguration()),
getTimeUnit(manager.getRegionServerServices().getConfiguration()));
this.manager = manager;
this.conn = conn;
}
@Override
protected void chore() {
try {
if (LOG.isTraceEnabled()) {
LOG.trace("Reading current quota snapshots from hbase:quota.");
}
// Get the snapshots that the quota manager is currently aware of
final Map currentSnapshots =
getManager().copyQuotaSnapshots();
// Read the new snapshots from the quota table
final Map newSnapshots = fetchSnapshotsFromQuotaTable();
if (LOG.isTraceEnabled()) {
LOG.trace(currentSnapshots.size() + " table quota snapshots are collected, "
+ "read " + newSnapshots.size() + " from the quota table.");
}
// Iterate over each new quota snapshot
for (Entry entry : newSnapshots.entrySet()) {
final TableName tableName = entry.getKey();
final SpaceQuotaSnapshot newSnapshot = entry.getValue();
// May be null!
final SpaceQuotaSnapshot currentSnapshot = currentSnapshots.get(tableName);
if (LOG.isTraceEnabled()) {
LOG.trace(tableName + ": current=" + currentSnapshot + ", new=" + newSnapshot);
}
if (!newSnapshot.equals(currentSnapshot)) {
// We have a new snapshot. We might need to enforce it or disable the enforcement
if (!isInViolation(currentSnapshot) && newSnapshot.getQuotaStatus().isInViolation()) {
if (LOG.isTraceEnabled()) {
LOG.trace("Enabling " + newSnapshot + " on " + tableName);
}
getManager().enforceViolationPolicy(tableName, newSnapshot);
}
if (isInViolation(currentSnapshot) && !newSnapshot.getQuotaStatus().isInViolation()) {
if (LOG.isTraceEnabled()) {
LOG.trace("Removing quota violation policy on " + tableName);
}
getManager().disableViolationPolicyEnforcement(tableName);
}
}
}
// We're intentionally ignoring anything extra with the currentSnapshots. If we were missing
// information from the RegionServers to create an accurate SpaceQuotaSnapshot in the Master,
// the Master will generate a new SpaceQuotaSnapshot which represents this state. This lets
// us avoid having to do anything special with currentSnapshots here.
// Update the snapshots in the manager
getManager().updateQuotaSnapshot(newSnapshots);
} catch (IOException e) {
LOG.warn(
"Caught exception while refreshing enforced quota violation policies, will retry.", e);
}
}
/**
* Checks if the given snapshot is in violation, allowing the snapshot to be null.
* If the snapshot is null, this is interpreted as no snapshot which implies not in violation.
*
* @param snapshot The snapshot to operate on.
* @return true if the snapshot is in violation, false otherwise.
*/
boolean isInViolation(SpaceQuotaSnapshot snapshot) {
if (snapshot == null) {
return false;
}
return snapshot.getQuotaStatus().isInViolation();
}
/**
* Reads all quota snapshots from the quota table.
*
* @return The current "view" of space use by each table.
*/
public Map fetchSnapshotsFromQuotaTable() throws IOException {
try (Table quotaTable = getConnection().getTable(QuotaUtil.QUOTA_TABLE_NAME);
ResultScanner scanner = quotaTable.getScanner(QuotaTableUtil.makeQuotaSnapshotScan())) {
Map snapshots = new HashMap<>();
for (Result result : scanner) {
try {
extractQuotaSnapshot(result, snapshots);
} catch (IllegalArgumentException e) {
final String msg = "Failed to parse result for row " + Bytes.toString(result.getRow());
LOG.error(msg, e);
throw new IOException(msg, e);
}
}
return snapshots;
}
}
/**
* Wrapper around {@link QuotaTableUtil#extractQuotaSnapshot(Result, Map)} for testing.
*/
void extractQuotaSnapshot(Result result, Map snapshots) {
QuotaTableUtil.extractQuotaSnapshot(result, snapshots);
}
Connection getConnection() {
return conn;
}
RegionServerSpaceQuotaManager getManager() {
return manager;
}
/**
* Extracts the period for the chore from the configuration.
*
* @param conf The configuration object.
* @return The configured chore period or the default value.
*/
static int getPeriod(Configuration conf) {
return conf.getInt(POLICY_REFRESHER_CHORE_PERIOD_KEY,
POLICY_REFRESHER_CHORE_PERIOD_DEFAULT);
}
/**
* Extracts the initial delay for the chore from the configuration.
*
* @param conf The configuration object.
* @return The configured chore initial delay or the default value.
*/
static long getInitialDelay(Configuration conf) {
return conf.getLong(POLICY_REFRESHER_CHORE_DELAY_KEY,
POLICY_REFRESHER_CHORE_DELAY_DEFAULT);
}
/**
* Extracts the time unit for the chore period and initial delay from the configuration. The
* configuration value for {@link #POLICY_REFRESHER_CHORE_TIMEUNIT_KEY} must correspond to
* a {@link TimeUnit} value.
*
* @param conf The configuration object.
* @return The configured time unit for the chore period and initial delay or the default value.
*/
static TimeUnit getTimeUnit(Configuration conf) {
return TimeUnit.valueOf(conf.get(POLICY_REFRESHER_CHORE_TIMEUNIT_KEY,
POLICY_REFRESHER_CHORE_TIMEUNIT_DEFAULT));
}
/**
* Extracts the percent of Regions for a table to have been reported to enable quota violation
* state change.
*
* @param conf The configuration object.
* @return The percent of regions reported to use.
*/
static Double getRegionReportPercent(Configuration conf) {
return conf.getDouble(POLICY_REFRESHER_CHORE_REPORT_PERCENT_KEY,
POLICY_REFRESHER_CHORE_REPORT_PERCENT_DEFAULT);
}
}