| /** |
| * 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.client; |
| |
| import static org.apache.hadoop.hbase.HConstants.DEFAULT_USE_META_REPLICAS; |
| import static org.apache.hadoop.hbase.HConstants.EMPTY_END_ROW; |
| import static org.apache.hadoop.hbase.HConstants.NINES; |
| import static org.apache.hadoop.hbase.HConstants.USE_META_REPLICAS; |
| import static org.apache.hadoop.hbase.HConstants.ZEROES; |
| import static org.apache.hadoop.hbase.TableName.META_TABLE_NAME; |
| import static org.apache.hadoop.hbase.client.AsyncRegionLocatorHelper.canUpdateOnError; |
| import static org.apache.hadoop.hbase.client.AsyncRegionLocatorHelper.createRegionLocations; |
| import static org.apache.hadoop.hbase.client.AsyncRegionLocatorHelper.isGood; |
| import static org.apache.hadoop.hbase.client.AsyncRegionLocatorHelper.removeRegionLocation; |
| import static org.apache.hadoop.hbase.client.ConnectionUtils.createClosestRowAfter; |
| import static org.apache.hadoop.hbase.client.ConnectionUtils.isEmptyStopRow; |
| import static org.apache.hadoop.hbase.client.RegionInfo.createRegionName; |
| import static org.apache.hadoop.hbase.client.RegionLocator.LOCATOR_META_REPLICAS_MODE; |
| import static org.apache.hadoop.hbase.util.Bytes.BYTES_COMPARATOR; |
| import static org.apache.hadoop.hbase.util.ConcurrentMapUtils.computeIfAbsent; |
| |
| import java.io.IOException; |
| import java.util.Arrays; |
| import java.util.HashSet; |
| import java.util.Iterator; |
| import java.util.LinkedHashMap; |
| import java.util.Map; |
| import java.util.Optional; |
| import java.util.Set; |
| import java.util.concurrent.CompletableFuture; |
| import java.util.concurrent.ConcurrentHashMap; |
| import java.util.concurrent.ConcurrentMap; |
| import java.util.concurrent.ConcurrentNavigableMap; |
| import java.util.concurrent.ConcurrentSkipListMap; |
| import java.util.concurrent.TimeUnit; |
| import org.apache.commons.lang3.ObjectUtils; |
| import org.apache.hadoop.hbase.CatalogFamilyFormat; |
| import org.apache.hadoop.hbase.HBaseIOException; |
| import org.apache.hadoop.hbase.HConstants; |
| import org.apache.hadoop.hbase.HRegionLocation; |
| import org.apache.hadoop.hbase.RegionLocations; |
| import org.apache.hadoop.hbase.ServerName; |
| import org.apache.hadoop.hbase.TableName; |
| import org.apache.hadoop.hbase.TableNotFoundException; |
| import org.apache.hadoop.hbase.client.Scan.ReadType; |
| import org.apache.hadoop.hbase.util.Bytes; |
| import org.apache.yetus.audience.InterfaceAudience; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import org.apache.hbase.thirdparty.com.google.common.base.Objects; |
| |
| /** |
| * The asynchronous locator for regions other than meta. |
| */ |
| @InterfaceAudience.Private |
| class AsyncNonMetaRegionLocator { |
| |
| private static final Logger LOG = LoggerFactory.getLogger(AsyncNonMetaRegionLocator.class); |
| |
| static final String MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE = |
| "hbase.client.meta.max.concurrent.locate.per.table"; |
| |
| private static final int DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE = 8; |
| |
| static String LOCATE_PREFETCH_LIMIT = "hbase.client.locate.prefetch.limit"; |
| |
| private static final int DEFAULT_LOCATE_PREFETCH_LIMIT = 10; |
| |
| private final AsyncConnectionImpl conn; |
| |
| private final int maxConcurrentLocateRequestPerTable; |
| |
| private final int locatePrefetchLimit; |
| |
| // The mode tells if HedgedRead, LoadBalance mode is supported. |
| // The default mode is CatalogReplicaMode.None. |
| private CatalogReplicaMode metaReplicaMode; |
| private CatalogReplicaLoadBalanceSelector metaReplicaSelector; |
| |
| private final ConcurrentMap<TableName, TableCache> cache = new ConcurrentHashMap<>(); |
| |
| private static final class LocateRequest { |
| |
| private final byte[] row; |
| |
| private final RegionLocateType locateType; |
| |
| public LocateRequest(byte[] row, RegionLocateType locateType) { |
| this.row = row; |
| this.locateType = locateType; |
| } |
| |
| @Override |
| public int hashCode() { |
| return Bytes.hashCode(row) ^ locateType.hashCode(); |
| } |
| |
| @Override |
| public boolean equals(Object obj) { |
| if (obj == null || obj.getClass() != LocateRequest.class) { |
| return false; |
| } |
| LocateRequest that = (LocateRequest) obj; |
| return locateType.equals(that.locateType) && Bytes.equals(row, that.row); |
| } |
| } |
| |
| private static final class TableCache { |
| |
| private final ConcurrentNavigableMap<byte[], RegionLocations> cache = |
| new ConcurrentSkipListMap<>(BYTES_COMPARATOR); |
| |
| private final Set<LocateRequest> pendingRequests = new HashSet<>(); |
| |
| private final Map<LocateRequest, CompletableFuture<RegionLocations>> allRequests = |
| new LinkedHashMap<>(); |
| |
| public boolean hasQuota(int max) { |
| return pendingRequests.size() < max; |
| } |
| |
| public boolean isPending(LocateRequest req) { |
| return pendingRequests.contains(req); |
| } |
| |
| public void send(LocateRequest req) { |
| pendingRequests.add(req); |
| } |
| |
| public Optional<LocateRequest> getCandidate() { |
| return allRequests.keySet().stream().filter(r -> !isPending(r)).findFirst(); |
| } |
| |
| public void clearCompletedRequests(RegionLocations locations) { |
| for (Iterator<Map.Entry<LocateRequest, CompletableFuture<RegionLocations>>> iter = |
| allRequests.entrySet().iterator(); iter.hasNext();) { |
| Map.Entry<LocateRequest, CompletableFuture<RegionLocations>> entry = iter.next(); |
| if (tryComplete(entry.getKey(), entry.getValue(), locations)) { |
| iter.remove(); |
| } |
| } |
| } |
| |
| private boolean tryComplete(LocateRequest req, CompletableFuture<RegionLocations> future, |
| RegionLocations locations) { |
| if (future.isDone()) { |
| return true; |
| } |
| if (locations == null) { |
| return false; |
| } |
| HRegionLocation loc = ObjectUtils.firstNonNull(locations.getRegionLocations()); |
| // we should at least have one location available, otherwise the request should fail and |
| // should not arrive here |
| assert loc != null; |
| boolean completed; |
| if (req.locateType.equals(RegionLocateType.BEFORE)) { |
| // for locating the row before current row, the common case is to find the previous region |
| // in reverse scan, so we check the endKey first. In general, the condition should be |
| // startKey < req.row and endKey >= req.row. Here we split it to endKey == req.row || |
| // (endKey > req.row && startKey < req.row). The two conditions are equal since startKey < |
| // endKey. |
| byte[] endKey = loc.getRegion().getEndKey(); |
| int c = Bytes.compareTo(endKey, req.row); |
| completed = c == 0 || ((c > 0 || Bytes.equals(EMPTY_END_ROW, endKey)) && |
| Bytes.compareTo(loc.getRegion().getStartKey(), req.row) < 0); |
| } else { |
| completed = loc.getRegion().containsRow(req.row); |
| } |
| if (completed) { |
| future.complete(locations); |
| return true; |
| } else { |
| return false; |
| } |
| } |
| } |
| |
| AsyncNonMetaRegionLocator(AsyncConnectionImpl conn) { |
| this.conn = conn; |
| this.maxConcurrentLocateRequestPerTable = conn.getConfiguration().getInt( |
| MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE, DEFAULT_MAX_CONCURRENT_LOCATE_REQUEST_PER_TABLE); |
| this.locatePrefetchLimit = |
| conn.getConfiguration().getInt(LOCATE_PREFETCH_LIMIT, DEFAULT_LOCATE_PREFETCH_LIMIT); |
| |
| // Get the region locator's meta replica mode. |
| this.metaReplicaMode = CatalogReplicaMode.fromString(conn.getConfiguration() |
| .get(LOCATOR_META_REPLICAS_MODE, CatalogReplicaMode.NONE.toString())); |
| |
| switch (this.metaReplicaMode) { |
| case LOAD_BALANCE: |
| String replicaSelectorClass = conn.getConfiguration(). |
| get(RegionLocator.LOCATOR_META_REPLICAS_MODE_LOADBALANCE_SELECTOR, |
| CatalogReplicaLoadBalanceSimpleSelector.class.getName()); |
| |
| this.metaReplicaSelector = CatalogReplicaLoadBalanceSelectorFactory.createSelector( |
| replicaSelectorClass, META_TABLE_NAME, conn, () -> { |
| int numOfReplicas = 1; |
| try { |
| RegionLocations metaLocations = conn.registry.getMetaRegionLocations().get( |
| conn.connConf.getReadRpcTimeoutNs(), TimeUnit.NANOSECONDS); |
| numOfReplicas = metaLocations.size(); |
| } catch (Exception e) { |
| LOG.error("Failed to get table {}'s region replication, ", META_TABLE_NAME, e); |
| } |
| return numOfReplicas; |
| }); |
| break; |
| case NONE: |
| // If user does not configure LOCATOR_META_REPLICAS_MODE, let's check the legacy config. |
| boolean useMetaReplicas = conn.getConfiguration().getBoolean(USE_META_REPLICAS, |
| DEFAULT_USE_META_REPLICAS); |
| if (useMetaReplicas) { |
| this.metaReplicaMode = CatalogReplicaMode.HEDGED_READ; |
| } |
| break; |
| default: |
| // Doing nothing |
| } |
| } |
| |
| private TableCache getTableCache(TableName tableName) { |
| return computeIfAbsent(cache, tableName, TableCache::new); |
| } |
| |
| private boolean isEqual(RegionLocations locs1, RegionLocations locs2) { |
| HRegionLocation[] locArr1 = locs1.getRegionLocations(); |
| HRegionLocation[] locArr2 = locs2.getRegionLocations(); |
| if (locArr1.length != locArr2.length) { |
| return false; |
| } |
| for (int i = 0; i < locArr1.length; i++) { |
| // do not need to compare region info |
| HRegionLocation loc1 = locArr1[i]; |
| HRegionLocation loc2 = locArr2[i]; |
| if (loc1 == null) { |
| if (loc2 != null) { |
| return false; |
| } |
| } else { |
| if (loc2 == null) { |
| return false; |
| } |
| if (loc1.getSeqNum() != loc2.getSeqNum()) { |
| return false; |
| } |
| if (!Objects.equal(loc1.getServerName(), loc2.getServerName())) { |
| return false; |
| } |
| } |
| } |
| return true; |
| } |
| |
| // if we successfully add the locations to cache, return the locations, otherwise return the one |
| // which prevents us being added. The upper layer can use this value to complete pending requests. |
| private RegionLocations addToCache(TableCache tableCache, RegionLocations locs) { |
| LOG.trace("Try adding {} to cache", locs); |
| byte[] startKey = locs.getRegionLocation().getRegion().getStartKey(); |
| for (;;) { |
| RegionLocations oldLocs = tableCache.cache.putIfAbsent(startKey, locs); |
| if (oldLocs == null) { |
| return locs; |
| } |
| // check whether the regions are the same, this usually happens when table is split/merged, or |
| // deleted and recreated again. |
| RegionInfo region = locs.getRegionLocation().getRegion(); |
| RegionInfo oldRegion = oldLocs.getRegionLocation().getRegion(); |
| if (region.getEncodedName().equals(oldRegion.getEncodedName())) { |
| RegionLocations mergedLocs = oldLocs.mergeLocations(locs); |
| if (isEqual(mergedLocs, oldLocs)) { |
| // the merged one is the same with the old one, give up |
| LOG.trace("Will not add {} to cache because the old value {} " + |
| " is newer than us or has the same server name." + |
| " Maybe it is updated before we replace it", locs, oldLocs); |
| return oldLocs; |
| } |
| if (tableCache.cache.replace(startKey, oldLocs, mergedLocs)) { |
| return mergedLocs; |
| } |
| } else { |
| // the region is different, here we trust the one we fetched. This maybe wrong but finally |
| // the upper layer can detect this and trigger removal of the wrong locations |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("The newnly fetch region {} is different from the old one {} for row '{}'," + |
| " try replaing the old one...", region, oldRegion, Bytes.toStringBinary(startKey)); |
| } |
| if (tableCache.cache.replace(startKey, oldLocs, locs)) { |
| return locs; |
| } |
| } |
| } |
| } |
| |
| private void complete(TableName tableName, LocateRequest req, RegionLocations locs, |
| Throwable error) { |
| if (error != null) { |
| LOG.warn("Failed to locate region in '" + tableName + "', row='" + |
| Bytes.toStringBinary(req.row) + "', locateType=" + req.locateType, error); |
| } |
| Optional<LocateRequest> toSend = Optional.empty(); |
| TableCache tableCache = getTableCache(tableName); |
| if (locs != null) { |
| RegionLocations addedLocs = addToCache(tableCache, locs); |
| synchronized (tableCache) { |
| tableCache.pendingRequests.remove(req); |
| tableCache.clearCompletedRequests(addedLocs); |
| // Remove a complete locate request in a synchronized block, so the table cache must have |
| // quota to send a candidate request. |
| toSend = tableCache.getCandidate(); |
| toSend.ifPresent(r -> tableCache.send(r)); |
| } |
| toSend.ifPresent(r -> locateInMeta(tableName, r)); |
| } else { |
| // we meet an error |
| assert error != null; |
| synchronized (tableCache) { |
| tableCache.pendingRequests.remove(req); |
| // fail the request itself, no matter whether it is a DoNotRetryIOException, as we have |
| // already retried several times |
| CompletableFuture<?> future = tableCache.allRequests.remove(req); |
| if (future != null) { |
| future.completeExceptionally(error); |
| } |
| tableCache.clearCompletedRequests(null); |
| // Remove a complete locate request in a synchronized block, so the table cache must have |
| // quota to send a candidate request. |
| toSend = tableCache.getCandidate(); |
| toSend.ifPresent(r -> tableCache.send(r)); |
| } |
| toSend.ifPresent(r -> locateInMeta(tableName, r)); |
| } |
| } |
| |
| // return whether we should stop the scan |
| private boolean onScanNext(TableName tableName, LocateRequest req, Result result) { |
| RegionLocations locs = CatalogFamilyFormat.getRegionLocations(result); |
| if (LOG.isDebugEnabled()) { |
| LOG.debug("The fetched location of '{}', row='{}', locateType={} is {}", tableName, |
| Bytes.toStringBinary(req.row), req.locateType, locs); |
| } |
| // remove HRegionLocation with null location, i.e, getServerName returns null. |
| if (locs != null) { |
| locs = locs.removeElementsWithNullLocation(); |
| } |
| |
| // the default region location should always be presented when fetching from meta, otherwise |
| // let's fail the request. |
| if (locs == null || locs.getDefaultRegionLocation() == null) { |
| complete(tableName, req, null, |
| new HBaseIOException(String.format("No location found for '%s', row='%s', locateType=%s", |
| tableName, Bytes.toStringBinary(req.row), req.locateType))); |
| return true; |
| } |
| HRegionLocation loc = locs.getDefaultRegionLocation(); |
| RegionInfo info = loc.getRegion(); |
| if (info == null) { |
| complete(tableName, req, null, |
| new HBaseIOException(String.format("HRegionInfo is null for '%s', row='%s', locateType=%s", |
| tableName, Bytes.toStringBinary(req.row), req.locateType))); |
| return true; |
| } |
| if (info.isSplitParent()) { |
| return false; |
| } |
| complete(tableName, req, locs, null); |
| return true; |
| } |
| |
| private void recordCacheHit() { |
| conn.getConnectionMetrics().ifPresent(MetricsConnection::incrMetaCacheHit); |
| } |
| |
| private void recordCacheMiss() { |
| conn.getConnectionMetrics().ifPresent(MetricsConnection::incrMetaCacheMiss); |
| } |
| |
| private RegionLocations locateRowInCache(TableCache tableCache, TableName tableName, byte[] row, |
| int replicaId) { |
| Map.Entry<byte[], RegionLocations> entry = tableCache.cache.floorEntry(row); |
| if (entry == null) { |
| recordCacheMiss(); |
| return null; |
| } |
| RegionLocations locs = entry.getValue(); |
| HRegionLocation loc = locs.getRegionLocation(replicaId); |
| if (loc == null) { |
| recordCacheMiss(); |
| return null; |
| } |
| byte[] endKey = loc.getRegion().getEndKey(); |
| if (isEmptyStopRow(endKey) || Bytes.compareTo(row, endKey) < 0) { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("Found {} in cache for {}, row='{}', locateType={}, replicaId={}", loc, tableName, |
| Bytes.toStringBinary(row), RegionLocateType.CURRENT, replicaId); |
| } |
| recordCacheHit(); |
| return locs; |
| } else { |
| recordCacheMiss(); |
| return null; |
| } |
| } |
| |
| private RegionLocations locateRowBeforeInCache(TableCache tableCache, TableName tableName, |
| byte[] row, int replicaId) { |
| boolean isEmptyStopRow = isEmptyStopRow(row); |
| Map.Entry<byte[], RegionLocations> entry = |
| isEmptyStopRow ? tableCache.cache.lastEntry() : tableCache.cache.lowerEntry(row); |
| if (entry == null) { |
| recordCacheMiss(); |
| return null; |
| } |
| RegionLocations locs = entry.getValue(); |
| HRegionLocation loc = locs.getRegionLocation(replicaId); |
| if (loc == null) { |
| recordCacheMiss(); |
| return null; |
| } |
| if (isEmptyStopRow(loc.getRegion().getEndKey()) || |
| (!isEmptyStopRow && Bytes.compareTo(loc.getRegion().getEndKey(), row) >= 0)) { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("Found {} in cache for {}, row='{}', locateType={}, replicaId={}", loc, tableName, |
| Bytes.toStringBinary(row), RegionLocateType.BEFORE, replicaId); |
| } |
| recordCacheHit(); |
| return locs; |
| } else { |
| recordCacheMiss(); |
| return null; |
| } |
| } |
| |
| private void locateInMeta(TableName tableName, LocateRequest req) { |
| if (LOG.isTraceEnabled()) { |
| LOG.trace("Try locate '" + tableName + "', row='" + Bytes.toStringBinary(req.row) + |
| "', locateType=" + req.locateType + " in meta"); |
| } |
| byte[] metaStartKey; |
| if (req.locateType.equals(RegionLocateType.BEFORE)) { |
| if (isEmptyStopRow(req.row)) { |
| byte[] binaryTableName = tableName.getName(); |
| metaStartKey = Arrays.copyOf(binaryTableName, binaryTableName.length + 1); |
| } else { |
| metaStartKey = createRegionName(tableName, req.row, ZEROES, false); |
| } |
| } else { |
| metaStartKey = createRegionName(tableName, req.row, NINES, false); |
| } |
| byte[] metaStopKey = |
| RegionInfo.createRegionName(tableName, HConstants.EMPTY_START_ROW, "", false); |
| Scan scan = new Scan().withStartRow(metaStartKey).withStopRow(metaStopKey, true) |
| .addFamily(HConstants.CATALOG_FAMILY).setReversed(true).setCaching(locatePrefetchLimit) |
| .setReadType(ReadType.PREAD); |
| |
| switch (this.metaReplicaMode) { |
| case LOAD_BALANCE: |
| int metaReplicaId = this.metaReplicaSelector.select(tableName, req.row, req.locateType); |
| if (metaReplicaId != RegionInfo.DEFAULT_REPLICA_ID) { |
| // If the selector gives a non-primary meta replica region, then go with it. |
| // Otherwise, just go to primary in non-hedgedRead mode. |
| scan.setConsistency(Consistency.TIMELINE); |
| scan.setReplicaId(metaReplicaId); |
| } |
| break; |
| case HEDGED_READ: |
| scan.setConsistency(Consistency.TIMELINE); |
| break; |
| default: |
| // do nothing |
| } |
| |
| conn.getTable(META_TABLE_NAME).scan(scan, new AdvancedScanResultConsumer() { |
| |
| private boolean completeNormally = false; |
| |
| private boolean tableNotFound = true; |
| |
| @Override |
| public void onError(Throwable error) { |
| complete(tableName, req, null, error); |
| } |
| |
| @Override |
| public void onComplete() { |
| if (tableNotFound) { |
| complete(tableName, req, null, new TableNotFoundException(tableName)); |
| } else if (!completeNormally) { |
| complete(tableName, req, null, new IOException( |
| "Unable to find region for '" + Bytes.toStringBinary(req.row) + "' in " + tableName)); |
| } |
| } |
| |
| @Override |
| public void onNext(Result[] results, ScanController controller) { |
| if (results.length == 0) { |
| return; |
| } |
| tableNotFound = false; |
| int i = 0; |
| for (; i < results.length; i++) { |
| if (onScanNext(tableName, req, results[i])) { |
| completeNormally = true; |
| controller.terminate(); |
| i++; |
| break; |
| } |
| } |
| // Add the remaining results into cache |
| if (i < results.length) { |
| TableCache tableCache = getTableCache(tableName); |
| for (; i < results.length; i++) { |
| RegionLocations locs = CatalogFamilyFormat.getRegionLocations(results[i]); |
| if (locs == null) { |
| continue; |
| } |
| HRegionLocation loc = locs.getDefaultRegionLocation(); |
| if (loc == null) { |
| continue; |
| } |
| RegionInfo info = loc.getRegion(); |
| if (info == null || info.isOffline() || info.isSplitParent()) { |
| continue; |
| } |
| RegionLocations addedLocs = addToCache(tableCache, locs); |
| synchronized (tableCache) { |
| tableCache.clearCompletedRequests(addedLocs); |
| } |
| } |
| } |
| } |
| }); |
| } |
| |
| private RegionLocations locateInCache(TableCache tableCache, TableName tableName, byte[] row, |
| int replicaId, RegionLocateType locateType) { |
| return locateType.equals(RegionLocateType.BEFORE) |
| ? locateRowBeforeInCache(tableCache, tableName, row, replicaId) |
| : locateRowInCache(tableCache, tableName, row, replicaId); |
| } |
| |
| // locateToPrevious is true means we will use the start key of a region to locate the region |
| // placed before it. Used for reverse scan. See the comment of |
| // AsyncRegionLocator.getPreviousRegionLocation. |
| private CompletableFuture<RegionLocations> getRegionLocationsInternal(TableName tableName, |
| byte[] row, int replicaId, RegionLocateType locateType, boolean reload) { |
| // AFTER should be convert to CURRENT before calling this method |
| assert !locateType.equals(RegionLocateType.AFTER); |
| TableCache tableCache = getTableCache(tableName); |
| if (!reload) { |
| RegionLocations locs = locateInCache(tableCache, tableName, row, replicaId, locateType); |
| if (isGood(locs, replicaId)) { |
| return CompletableFuture.completedFuture(locs); |
| } |
| } |
| CompletableFuture<RegionLocations> future; |
| LocateRequest req; |
| boolean sendRequest = false; |
| synchronized (tableCache) { |
| // check again |
| if (!reload) { |
| RegionLocations locs = locateInCache(tableCache, tableName, row, replicaId, locateType); |
| if (isGood(locs, replicaId)) { |
| return CompletableFuture.completedFuture(locs); |
| } |
| } |
| req = new LocateRequest(row, locateType); |
| future = tableCache.allRequests.get(req); |
| if (future == null) { |
| future = new CompletableFuture<>(); |
| tableCache.allRequests.put(req, future); |
| if (tableCache.hasQuota(maxConcurrentLocateRequestPerTable) && !tableCache.isPending(req)) { |
| tableCache.send(req); |
| sendRequest = true; |
| } |
| } |
| } |
| if (sendRequest) { |
| locateInMeta(tableName, req); |
| } |
| return future; |
| } |
| |
| CompletableFuture<RegionLocations> getRegionLocations(TableName tableName, byte[] row, |
| int replicaId, RegionLocateType locateType, boolean reload) { |
| // as we know the exact row after us, so we can just create the new row, and use the same |
| // algorithm to locate it. |
| if (locateType.equals(RegionLocateType.AFTER)) { |
| row = createClosestRowAfter(row); |
| locateType = RegionLocateType.CURRENT; |
| } |
| return getRegionLocationsInternal(tableName, row, replicaId, locateType, reload); |
| } |
| |
| private void recordClearRegionCache() { |
| conn.getConnectionMetrics().ifPresent(MetricsConnection::incrMetaCacheNumClearRegion); |
| } |
| |
| private void removeLocationFromCache(HRegionLocation loc) { |
| TableCache tableCache = cache.get(loc.getRegion().getTable()); |
| if (tableCache == null) { |
| return; |
| } |
| byte[] startKey = loc.getRegion().getStartKey(); |
| for (;;) { |
| RegionLocations oldLocs = tableCache.cache.get(startKey); |
| if (oldLocs == null) { |
| return; |
| } |
| HRegionLocation oldLoc = oldLocs.getRegionLocation(loc.getRegion().getReplicaId()); |
| if (!canUpdateOnError(loc, oldLoc)) { |
| return; |
| } |
| // Tell metaReplicaSelector that the location is stale. It will create a stale entry |
| // with timestamp internally. Next time the client looks up the same location, |
| // it will pick a different meta replica region. |
| if (this.metaReplicaMode == CatalogReplicaMode.LOAD_BALANCE) { |
| metaReplicaSelector.onError(loc); |
| } |
| |
| RegionLocations newLocs = removeRegionLocation(oldLocs, loc.getRegion().getReplicaId()); |
| if (newLocs == null) { |
| if (tableCache.cache.remove(startKey, oldLocs)) { |
| recordClearRegionCache(); |
| return; |
| } |
| } else { |
| if (tableCache.cache.replace(startKey, oldLocs, newLocs)) { |
| recordClearRegionCache(); |
| return; |
| } |
| } |
| } |
| } |
| |
| private void addLocationToCache(HRegionLocation loc) { |
| addToCache(getTableCache(loc.getRegion().getTable()), createRegionLocations(loc)); |
| } |
| |
| private HRegionLocation getCachedLocation(HRegionLocation loc) { |
| TableCache tableCache = cache.get(loc.getRegion().getTable()); |
| if (tableCache == null) { |
| return null; |
| } |
| RegionLocations locs = tableCache.cache.get(loc.getRegion().getStartKey()); |
| return locs != null ? locs.getRegionLocation(loc.getRegion().getReplicaId()) : null; |
| } |
| |
| void updateCachedLocationOnError(HRegionLocation loc, Throwable exception) { |
| Optional<MetricsConnection> connectionMetrics = conn.getConnectionMetrics(); |
| AsyncRegionLocatorHelper.updateCachedLocationOnError(loc, exception, this::getCachedLocation, |
| this::addLocationToCache, this::removeLocationFromCache, connectionMetrics.orElse(null)); |
| } |
| |
| void clearCache(TableName tableName) { |
| TableCache tableCache = cache.remove(tableName); |
| if (tableCache == null) { |
| return; |
| } |
| synchronized (tableCache) { |
| if (!tableCache.allRequests.isEmpty()) { |
| IOException error = new IOException("Cache cleared"); |
| tableCache.allRequests.values().forEach(f -> f.completeExceptionally(error)); |
| } |
| } |
| conn.getConnectionMetrics() |
| .ifPresent(metrics -> metrics.incrMetaCacheNumClearRegion(tableCache.cache.size())); |
| } |
| |
| void clearCache() { |
| cache.clear(); |
| } |
| |
| void clearCache(ServerName serverName) { |
| for (TableCache tableCache : cache.values()) { |
| for (Map.Entry<byte[], RegionLocations> entry : tableCache.cache.entrySet()) { |
| byte[] regionName = entry.getKey(); |
| RegionLocations locs = entry.getValue(); |
| RegionLocations newLocs = locs.removeByServer(serverName); |
| if (locs == newLocs) { |
| continue; |
| } |
| if (newLocs.isEmpty()) { |
| tableCache.cache.remove(regionName, locs); |
| } else { |
| tableCache.cache.replace(regionName, locs, newLocs); |
| } |
| } |
| } |
| } |
| |
| // only used for testing whether we have cached the location for a region. |
| RegionLocations getRegionLocationInCache(TableName tableName, byte[] row) { |
| TableCache tableCache = cache.get(tableName); |
| if (tableCache == null) { |
| return null; |
| } |
| return locateRowInCache(tableCache, tableName, row, RegionReplicaUtil.DEFAULT_REPLICA_ID); |
| } |
| |
| // only used for testing whether we have cached the location for a table. |
| int getNumberOfCachedRegionLocations(TableName tableName) { |
| TableCache tableCache = cache.get(tableName); |
| if (tableCache == null) { |
| return 0; |
| } |
| return tableCache.cache.values().stream().mapToInt(RegionLocations::numNonNullElements).sum(); |
| } |
| } |
