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/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch 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.elasticsearch.hadoop.rest;
import org.apache.commons.logging.Log;
import org.elasticsearch.hadoop.EsHadoopIllegalArgumentException;
import org.elasticsearch.hadoop.cfg.ConfigurationOptions;
import org.elasticsearch.hadoop.cfg.FieldPresenceValidation;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.rest.query.BoolQueryBuilder;
import org.elasticsearch.hadoop.rest.query.ConstantScoreQueryBuilder;
import org.elasticsearch.hadoop.rest.query.QueryBuilder;
import org.elasticsearch.hadoop.rest.query.QueryUtils;
import org.elasticsearch.hadoop.rest.query.RawQueryBuilder;
import org.elasticsearch.hadoop.rest.request.GetAliasesRequestBuilder;
import org.elasticsearch.hadoop.serialization.ScrollReader;
import org.elasticsearch.hadoop.serialization.ScrollReaderConfigBuilder;
import org.elasticsearch.hadoop.serialization.builder.ValueReader;
import org.elasticsearch.hadoop.serialization.dto.IndicesAliases;
import org.elasticsearch.hadoop.serialization.dto.NodeInfo;
import org.elasticsearch.hadoop.serialization.dto.ShardInfo;
import org.elasticsearch.hadoop.serialization.dto.mapping.Mapping;
import org.elasticsearch.hadoop.serialization.dto.mapping.MappingSet;
import org.elasticsearch.hadoop.serialization.dto.mapping.MappingUtils;
import org.elasticsearch.hadoop.serialization.field.IndexExtractor;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.ClusterInfo;
import org.elasticsearch.hadoop.util.EsMajorVersion;
import org.elasticsearch.hadoop.util.IOUtils;
import org.elasticsearch.hadoop.util.ObjectUtils;
import org.elasticsearch.hadoop.util.SettingsUtils;
import org.elasticsearch.hadoop.util.StringUtils;
import org.elasticsearch.hadoop.util.Version;
import java.io.Closeable;
import java.io.IOException;
import java.io.Serializable;
import java.net.InetAddress;
import java.net.SocketException;
import java.net.UnknownHostException;
import java.util.ArrayList;
import java.util.Collections;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import java.util.Random;
import java.util.Set;
public abstract class RestService implements Serializable {
public static class PartitionReader implements Closeable {
public final ScrollReader scrollReader;
public final RestRepository client;
public final SearchRequestBuilder queryBuilder;
private ScrollQuery scrollQuery;
private boolean closed = false;
PartitionReader(ScrollReader scrollReader, RestRepository client, SearchRequestBuilder queryBuilder) {
this.scrollReader = scrollReader;
this.client = client;
this.queryBuilder = queryBuilder;
}
@Override
public void close() {
if (!closed) {
closed = true;
if (scrollQuery != null) {
scrollQuery.close();
}
client.close();
}
}
public ScrollQuery scrollQuery() {
if (scrollQuery == null) {
scrollQuery = queryBuilder.build(client, scrollReader);
}
return scrollQuery;
}
}
public static class PartitionWriter implements Closeable {
public final RestRepository repository;
public final long number;
public final int total;
public final Settings settings;
private boolean closed = false;
PartitionWriter(Settings settings, long splitIndex, int splitsSize, RestRepository repository) {
this.settings = settings;
this.repository = repository;
this.number = splitIndex;
this.total = splitsSize;
}
@Override
public void close() {
if (!closed) {
closed = true;
repository.close();
}
}
}
public static class MultiReaderIterator implements Closeable, Iterator {
private final List definitions;
private final Iterator definitionIterator;
private PartitionReader currentReader;
private ScrollQuery currentScroll;
private boolean finished = false;
private final Settings settings;
private final Log log;
MultiReaderIterator(List defs, Settings settings, Log log) {
this.definitions = defs;
definitionIterator = defs.iterator();
this.settings = settings;
this.log = log;
}
@Override
public void close() {
if (finished) {
return;
}
ScrollQuery sq = getCurrent();
if (sq != null) {
sq.close();
}
if (currentReader != null) {
currentReader.close();
}
finished = true;
}
@Override
public boolean hasNext() {
ScrollQuery sq = getCurrent();
return (sq != null ? sq.hasNext() : false);
}
private ScrollQuery getCurrent() {
if (finished) {
return null;
}
for (boolean hasValue = false; !hasValue; ) {
if (currentReader == null) {
if (definitionIterator.hasNext()) {
currentReader = RestService.createReader(settings, definitionIterator.next(), log);
} else {
finished = true;
return null;
}
}
if (currentScroll == null) {
currentScroll = currentReader.scrollQuery();
}
hasValue = currentScroll.hasNext();
if (!hasValue) {
currentScroll.close();
currentScroll = null;
currentReader.close();
currentReader = null;
}
}
return currentScroll;
}
@Override
public Object[] next() {
ScrollQuery sq = getCurrent();
return sq.next();
}
@Override
public void remove() {
throw new UnsupportedOperationException();
}
}
@SuppressWarnings("unchecked")
public static List findPartitions(Settings settings, Log log) {
Version.logVersion();
InitializationUtils.validateSettings(settings);
ClusterInfo clusterInfo = InitializationUtils.discoverAndValidateClusterInfo(settings, log);
InitializationUtils.validateSettingsForReading(settings);
List nodes = InitializationUtils.discoverNodesIfNeeded(settings, log);
InitializationUtils.filterNonClientNodesIfNeeded(settings, log);
InitializationUtils.filterNonDataNodesIfNeeded(settings, log);
InitializationUtils.filterNonIngestNodesIfNeeded(settings, log);
RestRepository client = new RestRepository(settings);
try {
boolean allIndicesExist = client.resourceExists(true);
if (!allIndicesExist && !settings.getIndexReadMissingAsEmpty()) {
throw new EsHadoopIllegalArgumentException(
String.format("Index [%s] missing and settings [%s] is set to false", settings.getResourceRead(), ConfigurationOptions.ES_INDEX_READ_MISSING_AS_EMPTY));
}
/*
* allIndicesExist will be false if even a single index does not exist (if multiple are in the resources string). If it is
* false, we have knowing if any index exists so we have to make the following requests regardless. They will return empty if
* none of the indices exist, so there's no harm other than the wasted time.
*/
final List>> shards = client.getReadTargetShards();
if (log.isTraceEnabled()) {
log.trace("Creating splits for shards " + shards);
}
log.info(String.format("Reading from [%s]", settings.getResourceRead()));
MappingSet mapping = null;
if (!shards.isEmpty()) {
mapping = client.getMappings();
if (log.isDebugEnabled()) {
log.debug(String.format("Discovered resolved mapping {%s} for [%s]", mapping.getResolvedView(), settings.getResourceRead()));
}
// validate if possible
FieldPresenceValidation validation = settings.getReadFieldExistanceValidation();
if (validation.isRequired()) {
MappingUtils.validateMapping(SettingsUtils.determineSourceFields(settings), mapping.getResolvedView(), validation, log);
}
}
final Map nodesMap = new HashMap();
if (nodes != null) {
for (NodeInfo node : nodes) {
nodesMap.put(node.getId(), node);
}
}
final List partitions;
if (clusterInfo.getMajorVersion().onOrAfter(EsMajorVersion.V_5_X) && settings.getMaxDocsPerPartition() != null) {
partitions = findSlicePartitions(client.getRestClient(), settings, mapping, nodesMap, shards, log);
} else {
partitions = findShardPartitions(settings, mapping, nodesMap, shards, log);
}
Collections.shuffle(partitions);
return partitions;
} finally {
client.close();
}
}
/**
* Create one {@link PartitionDefinition} per shard for each requested index.
*/
static List findShardPartitions(Settings settings, MappingSet mappingSet, Map nodes,
List>> shards, Log log) {
Mapping resolvedMapping = mappingSet == null ? null : mappingSet.getResolvedView();
List partitions = new ArrayList(shards.size());
PartitionDefinition.PartitionDefinitionBuilder partitionBuilder = PartitionDefinition.builder(settings, resolvedMapping);
for (List> group : shards) {
String index = null;
int shardId = -1;
List locationList = new ArrayList ();
for (Map replica : group) {
ShardInfo shard = new ShardInfo(replica);
index = shard.getIndex();
shardId = shard.getName();
if (nodes.containsKey(shard.getNode())) {
locationList.add(nodes.get(shard.getNode()).getPublishAddress());
}
}
if (index == null) {
// Could not find shards for this partition. Continue anyway?
if (settings.getIndexReadAllowRedStatus()) {
log.warn("Shard information is missing from an index and will not be reached during job execution. " +
"Assuming shard is unavailable and cluster is red! Continuing with read operation by " +
"skipping this shard! This may result in incomplete data retrieval!");
} else {
throw new IllegalStateException("Could not locate shard information for one of the read indices. " +
"Check your cluster status to see if it is unstable!");
}
} else {
PartitionDefinition partition = partitionBuilder.build(index, shardId, locationList.toArray(new String[0]));
partitions.add(partition);
}
}
return partitions;
}
/**
* Partitions the query based on the max number of documents allowed per partition {@link Settings#getMaxDocsPerPartition()}.
*/
static List findSlicePartitions(RestClient client, Settings settings, MappingSet mappingSet,
Map nodes, List>> shards, Log log) {
QueryBuilder query = QueryUtils.parseQueryAndFilters(settings);
Integer maxDocsPerPartition = settings.getMaxDocsPerPartition();
Assert.notNull(maxDocsPerPartition, "Attempting to find slice partitions but maximum documents per partition is not set.");
Resource readResource = new Resource(settings, true);
Mapping resolvedMapping = mappingSet == null ? null : mappingSet.getResolvedView();
PartitionDefinition.PartitionDefinitionBuilder partitionBuilder = PartitionDefinition.builder(settings, resolvedMapping);
List partitions = new ArrayList(shards.size());
for (List> group : shards) {
String index = null;
int shardId = -1;
List locationList = new ArrayList ();
for (Map replica : group) {
ShardInfo shard = new ShardInfo(replica);
index = shard.getIndex();
shardId = shard.getName();
if (nodes.containsKey(shard.getNode())) {
locationList.add(nodes.get(shard.getNode()).getPublishAddress());
}
}
String[] locations = locationList.toArray(new String[0]);
if (index == null) {
// Could not find shards for this partition. Continue anyway?
if (settings.getIndexReadAllowRedStatus()) {
log.warn("Shard information is missing from an index and will not be reached during job execution. " +
"Assuming shard is unavailable and cluster is red! Continuing with read operation by " +
"skipping this shard! This may result in incomplete data retrieval!");
} else {
throw new IllegalStateException("Could not locate shard information for one of the read indices. " +
"Check your cluster status to see if it is unstable!");
}
} else {
// TODO applyAliasMetaData should be called in order to ensure that the count are exact (alias filters and routing may change the number of documents)
long numDocs;
if (readResource.isTyped()) {
numDocs = client.count(index, readResource.type(), Integer.toString(shardId), query);
} else {
numDocs = client.countIndexShard(index, Integer.toString(shardId), query);
}
int numPartitions = (int) Math.max(1, numDocs / maxDocsPerPartition);
for (int i = 0; i < numPartitions; i++) {
PartitionDefinition.Slice slice = new PartitionDefinition.Slice(i, numPartitions);
partitions.add(partitionBuilder.build(index, shardId, slice, locations));
}
}
}
return partitions;
}
/**
* Returns the first address in {@code locations} that is equals to a public IP of the system
* @param locations The list of address (hostname:port or ip:port) to check
* @return The first address in {@code locations} that is equals to a public IP of the system or null if none
*/
static String checkLocality(String[] locations, Log log) {
try {
InetAddress[] candidates = NetworkUtils.getGlobalInterfaces();
for (String address : locations) {
StringUtils.IpAndPort ipAndPort = StringUtils.parseIpAddress(address);
InetAddress addr = InetAddress.getByName(ipAndPort.ip);
for (InetAddress candidate : candidates) {
if (addr.equals(candidate)) {
return address;
}
}
}
} catch (SocketException e) {
if (log.isDebugEnabled()) {
log.debug("Unable to retrieve the global interfaces of the system", e);
}
} catch (UnknownHostException e) {
if (log.isDebugEnabled()) {
log.debug("Unable to retrieve IP address", e);
}
}
return null;
}
/**
* Creates a PartitionReader from a {@code PartitionDefinition}
* @param settings The settings for the reader
* @param partition The {@link PartitionDefinition} used to create the reader
* @param log The logger
* @return The {@link PartitionReader} that is able to read the documents associated with the {@code partition}
*/
public static PartitionReader createReader(Settings settings, PartitionDefinition partition, Log log) {
if (!SettingsUtils.hasPinnedNode(settings) && partition.getLocations().length > 0) {
String pinAddress = checkLocality(partition.getLocations(), log);
if (pinAddress != null) {
if (log.isDebugEnabled()) {
log.debug(String.format("Partition reader instance [%s] assigned to [%s]", partition, pinAddress));
}
SettingsUtils.pinNode(settings, pinAddress);
}
}
ClusterInfo clusterInfo = InitializationUtils.discoverClusterInfo(settings, log);
ValueReader reader = ObjectUtils.instantiate(settings.getSerializerValueReaderClassName(), settings);
// initialize REST client
RestRepository repository = new RestRepository(settings);
Mapping fieldMapping = null;
if (StringUtils.hasText(partition.getSerializedMapping())) {
fieldMapping = IOUtils.deserializeFromJsonString(partition.getSerializedMapping(), Mapping.class);
}
else {
log.warn(String.format("No mapping found for [%s] - either no index exists or the partition configuration has been corrupted", partition));
}
ScrollReader scrollReader = new ScrollReader(ScrollReaderConfigBuilder.builder(reader, fieldMapping, settings));
if (settings.getNodesClientOnly()) {
String clientNode = repository.getRestClient().getCurrentNode();
if (log.isDebugEnabled()) {
log.debug(String.format("Client-node routing detected; partition reader instance [%s] assigned to [%s]",
partition, clientNode));
}
SettingsUtils.pinNode(settings, clientNode);
}
// take into account client node routing
boolean includeVersion = settings.getReadMetadata() && settings.getReadMetadataVersion();
Resource read = new Resource(settings, true);
SearchRequestBuilder requestBuilder =
new SearchRequestBuilder(clusterInfo.getMajorVersion(), includeVersion)
.resource(read)
// Overwrite the index name from the resource to be that of the concrete index in the partition definition
.indices(partition.getIndex())
.query(QueryUtils.parseQuery(settings))
.scroll(settings.getScrollKeepAlive())
.size(settings.getScrollSize())
.limit(settings.getScrollLimit())
.fields(SettingsUtils.determineSourceFields(settings))
.filters(QueryUtils.parseFilters(settings))
.shard(Integer.toString(partition.getShardId()))
.readMetadata(settings.getReadMetadata())
.local(true)
.preference(settings.getShardPreference())
.excludeSource(settings.getExcludeSource());
if (partition.getSlice() != null && partition.getSlice().max > 1) {
requestBuilder.slice(partition.getSlice().id, partition.getSlice().max);
}
String[] indices = read.index().split(",");
if (QueryUtils.isExplicitlyRequested(partition.getIndex(), indices) == false) {
IndicesAliases indicesAliases =
new GetAliasesRequestBuilder(repository.getRestClient())
.indices(partition.getIndex())
.execute().getIndices();
Map aliases = indicesAliases.getAliases(partition.getIndex());
if (aliases != null && aliases.size() > 0) {
requestBuilder = applyAliasMetadata(clusterInfo.getMajorVersion(), aliases, requestBuilder, partition.getIndex(), indices);
}
}
return new PartitionReader(scrollReader, repository, requestBuilder);
}
/**
* Check if the index name is part of the requested indices or the result of an alias.
* If the index is the result of an alias, the filters and routing values of the alias are added in the
* provided {@link SearchRequestBuilder}.
*/
static SearchRequestBuilder applyAliasMetadata(EsMajorVersion version,
Map aliases,
SearchRequestBuilder searchRequestBuilder,
String index, String... indicesOrAliases) {
if (QueryUtils.isExplicitlyRequested(index, indicesOrAliases)) {
return searchRequestBuilder;
}
Set routing = new HashSet();
List aliasFilters = new ArrayList();
for (IndicesAliases.Alias alias : aliases.values()) {
if (QueryUtils.isExplicitlyRequested(alias.getName(), indicesOrAliases)) {
// The alias is explicitly requested
if (StringUtils.hasLength(alias.getSearchRouting())) {
for (String value : alias.getSearchRouting().split(",")) {
routing.add(value.trim());
}
}
if (alias.getFilter() != null) {
try {
aliasFilters.add(new RawQueryBuilder(alias.getFilter(), false));
} catch (IOException e) {
throw new EsHadoopIllegalArgumentException("Failed to parse alias filter: [" + alias.getFilter() + "]");
}
}
}
}
if (aliasFilters.size() > 0) {
QueryBuilder aliasQuery;
if (aliasFilters.size() == 1) {
aliasQuery = aliasFilters.get(0);
} else {
aliasQuery = new BoolQueryBuilder();
for (QueryBuilder filter : aliasFilters) {
((BoolQueryBuilder) aliasQuery).should(filter);
}
}
if (searchRequestBuilder.query() == null) {
searchRequestBuilder.query(aliasQuery);
} else {
BoolQueryBuilder mainQuery = new BoolQueryBuilder();
mainQuery.must(searchRequestBuilder.query());
if (version.after(EsMajorVersion.V_1_X)) {
mainQuery.filter(aliasQuery);
} else {
mainQuery.must(new ConstantScoreQueryBuilder().filter(aliasQuery).boost(0.0f));
}
searchRequestBuilder.query(mainQuery);
}
}
if (routing.size() > 0) {
searchRequestBuilder.routing(StringUtils.concatenate(routing, ","));
}
return searchRequestBuilder;
}
// expects currentTask to start from 0
public static List assignPartitions(List partitions, int currentTask, int totalTasks) {
int esPartitions = partitions.size();
if (totalTasks >= esPartitions) {
return (currentTask >= esPartitions ? Collections.emptyList() : Collections.singletonList(partitions.get(currentTask)));
} else {
int partitionsPerTask = esPartitions / totalTasks;
int remainder = esPartitions % totalTasks;
int partitionsPerCurrentTask = partitionsPerTask;
// spread the reminder against the tasks
if (currentTask < remainder) {
partitionsPerCurrentTask++;
}
// find the offset inside the collection
int offset = partitionsPerTask * currentTask;
if (currentTask != 0) {
offset += (remainder > currentTask ? 1 : remainder);
}
// common case
if (partitionsPerCurrentTask == 1) {
return Collections.singletonList(partitions.get(offset));
}
List pa = new ArrayList(partitionsPerCurrentTask);
for (int index = offset; index < offset + partitionsPerCurrentTask; index++) {
pa.add(partitions.get(index));
}
return pa;
}
}
public static MultiReaderIterator multiReader(Settings settings, List definitions, Log log) {
return new MultiReaderIterator(definitions, settings, log);
}
public static PartitionWriter createWriter(Settings settings, long currentSplit, int totalSplits, Log log) {
Version.logVersion();
InitializationUtils.validateSettings(settings);
InitializationUtils.discoverAndValidateClusterInfo(settings, log);
InitializationUtils.validateSettingsForWriting(settings);
InitializationUtils.discoverNodesIfNeeded(settings, log);
InitializationUtils.filterNonClientNodesIfNeeded(settings, log);
InitializationUtils.filterNonDataNodesIfNeeded(settings, log);
InitializationUtils.filterNonIngestNodesIfNeeded(settings, log);
List nodes = SettingsUtils.discoveredOrDeclaredNodes(settings);
// check invalid splits (applicable when running in non-MR environments) - in this case fall back to Random..
int selectedNode = (currentSplit < 0) ? new Random().nextInt(nodes.size()) : (int)(currentSplit % nodes.size());
// select the appropriate nodes first, to spread the load before-hand
SettingsUtils.pinNode(settings, nodes.get(selectedNode));
Resource resource = new Resource(settings, false);
log.info(String.format("Writing to [%s]", resource));
// single index vs multi indices
IndexExtractor iformat = ObjectUtils.instantiate(settings.getMappingIndexExtractorClassName(), settings);
iformat.compile(resource.toString());
// Create the partition writer and its client
RestRepository repository;
if (iformat.hasPattern()) {
// Can't be sure if a multi-index pattern will resolve to indices or aliases
// during the job. It's better to trust the user and discover any issues the
// hard way at runtime.
repository = initMultiIndices(settings, currentSplit, resource, log);
} else {
// Make sure the resource name is a valid singular index name string candidate
if (!StringUtils.isValidSingularIndexName(resource.index())) {
throw new EsHadoopIllegalArgumentException("Illegal write index name [" + resource.index() + "]. Write resources must " +
"be lowercase singular index names, with no illegal pattern characters except for multi-resource writes.");
}
// Determine if the configured index is an alias.
RestClient bootstrap = new RestClient(settings);
GetAliasesRequestBuilder.Response response = null;
try {
response = new GetAliasesRequestBuilder(bootstrap).aliases(resource.index()).execute();
} catch (EsHadoopInvalidRequest remoteException) {
// For now, the get alias call throws if it does not find an alias that matches. Just log and continue.
if (log.isDebugEnabled()) {
log.debug(String.format("Provided index name [%s] is not an alias. Reason: [%s]",
resource.index(), remoteException.getMessage()));
}
} finally {
bootstrap.close();
}
// Validate the alias for writing, or pin to a single index shard.
if (response != null && response.hasAliases()) {
repository = initAliasWrite(response, settings, currentSplit, resource, log);
} else {
repository = initSingleIndex(settings, currentSplit, resource, log);
}
}
return new PartitionWriter(settings, currentSplit, totalSplits, repository);
}
/**
* Validate and configure a rest repository for writing to an index.
* The index is potentially created if it does not exist, and the
* client is pinned to a node that hosts one of the index's primary
* shards based on its currentInstance number.
* @param settings Job settings
* @param currentInstance Partition number
* @param resource Configured write resource
* @param log Logger to use
* @return The RestRepository to be used by the partition writer
*/
private static RestRepository initSingleIndex(Settings settings, long currentInstance, Resource resource, Log log) {
if (log.isDebugEnabled()) {
log.debug(String.format("Resource [%s] resolves as a single index", resource));
}
RestRepository repository = new RestRepository(settings);
// create the index if needed
if (repository.touch()) {
if (repository.waitForYellow()) {
log.warn(String.format("Timed out waiting for index [%s] to reach yellow health", resource));
}
}
// if WAN mode is used, use an already selected node
if (settings.getNodesWANOnly()) {
String node = SettingsUtils.getPinnedNode(settings);
if (log.isDebugEnabled()) {
log.debug(String.format("Partition writer instance [%s] assigned to [%s]", currentInstance, node));
}
return repository;
}
// if client-nodes are used, simply use the underlying nodes
if (settings.getNodesClientOnly()) {
String clientNode = repository.getRestClient().getCurrentNode();
if (log.isDebugEnabled()) {
log.debug(String.format("Client-node routing detected; partition writer instance [%s] assigned to [%s]",
currentInstance, clientNode));
}
return repository;
}
// no routing necessary; select the relevant target shard/node
Map targetShards = repository.getWriteTargetPrimaryShards(settings.getNodesClientOnly());
repository.close();
String nodeAddress;
if (targetShards.isEmpty()) {
List nodes = SettingsUtils.discoveredOrDeclaredNodes(settings);
nodeAddress = nodes.get(new Random().nextInt(nodes.size()));
if (log.isDebugEnabled()) {
log.debug(String.format("Shards not found for partition writer instance [%s], so node [%s] has been randomly selected",
currentInstance, nodeAddress));
}
} else {
List orderedShards = new ArrayList(targetShards.keySet());
// make sure the order is strict
Collections.sort(orderedShards);
if (log.isTraceEnabled()) {
log.trace(String.format("Partition writer instance [%s] discovered [%s] primary shards %s", currentInstance, orderedShards.size(), orderedShards));
}
// if there's no task info, just pick a random bucket
if (currentInstance <= 0) {
currentInstance = new Random().nextInt(targetShards.size()) + 1;
}
int bucket = (int) (currentInstance % targetShards.size());
ShardInfo chosenShard = orderedShards.get(bucket);
NodeInfo targetNode = targetShards.get(chosenShard);
nodeAddress = targetNode.getPublishAddress();
if (log.isDebugEnabled()) {
log.debug(String.format("Partition writer instance [%s] assigned using primary shard [%s] to choose node [%s]",
currentInstance, chosenShard.getName(), nodeAddress));
}
}
// pin settings
SettingsUtils.pinNode(settings, nodeAddress);
String node = SettingsUtils.getPinnedNode(settings);
repository = new RestRepository(settings);
if (log.isDebugEnabled()) {
log.debug(String.format("Partition writer instance [%s] assigned to address [%s]", currentInstance, node));
}
return repository;
}
/**
* Creates a RestRepository for use with a multi-index resource pattern. The client is left pinned
* to the original node that it was pinned to since the shard locations cannot be determined at all.
* @param settings Job settings
* @param currentInstance Partition number
* @param resource Configured write resource
* @param log Logger to use
* @return The RestRepository to be used by the partition writer
*/
private static RestRepository initMultiIndices(Settings settings, long currentInstance, Resource resource, Log log) {
if (log.isDebugEnabled()) {
log.debug(String.format("Resource [%s] resolves as an index pattern", resource));
}
// multi-index write - since we don't know before hand what index will be used, use an already selected node
String node = SettingsUtils.getPinnedNode(settings);
if (log.isDebugEnabled()) {
log.debug(String.format("Partition writer instance [%s] assigned to [%s]", currentInstance, node));
}
return new RestRepository(settings);
}
/**
* Validate and configure a rest repository for writing to an alias backed by a valid write-index.
* This validation only checks that an alias is valid at time of job start, and makes no guarantees
* about the alias changing during the execution.
* @param response Response from the get alias call
* @param settings Job settings
* @param currentInstance Partition number
* @param resource Configured write resource
* @param log Logger to use
* @return The RestRepository to be used by the partition writer
*/
private static RestRepository initAliasWrite(GetAliasesRequestBuilder.Response response, Settings settings, long currentInstance,
Resource resource, Log log) {
if (log.isDebugEnabled()) {
log.debug(String.format("Resource [%s] resolves as an index alias", resource));
}
// indexName -> aliasName -> alias definition
Map> indexAliasTable = response.getIndices().getAll();
if (indexAliasTable.size() < 1) {
// Sanity check
throw new EsHadoopIllegalArgumentException("Cannot initialize alias write resource [" + resource.index() +
"] if it does not have any alias entries.");
} else if (indexAliasTable.size() > 1) {
// Multiple indices, validate that one index-alias relation has its write index flag set
String currentWriteIndex = null;
for (Map.Entry> indexRow : indexAliasTable.entrySet()) {
String indexName = indexRow.getKey();
Map aliases = indexRow.getValue();
IndicesAliases.Alias aliasInfo = aliases.get(resource.index());
if (aliasInfo.isWriteIndex()) {
currentWriteIndex = indexName;
break;
}
}
if (currentWriteIndex == null) {
throw new EsHadoopIllegalArgumentException("Attempting to write to alias [" + resource.index() + "], " +
"but detected multiple indices [" + indexAliasTable.size() + "] with no write index selected. " +
"Bailing out...");
} else {
if (log.isDebugEnabled()) {
log.debug(String.format("Writing to currently configured write-index [%s]", currentWriteIndex));
}
}
} else {
// Single index in the alias, but we should still not pin the nodes
if (log.isDebugEnabled()) {
log.debug(String.format("Writing to the alias's single configured index [%s]", indexAliasTable.keySet().iterator().next()));
}
}
// alias-index write - since we don't know beforehand what concrete index will be used at any
// given time during the job, use an already selected node
String node = SettingsUtils.getPinnedNode(settings);
if (log.isDebugEnabled()) {
log.debug(String.format("Partition writer instance [%s] assigned to [%s]", currentInstance, node));
}
return new RestRepository(settings);
}
}
