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Elasticsearch Hadoop Map/Reduce
/*
* 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.apache.commons.logging.LogFactory;
import org.elasticsearch.hadoop.EsHadoopIllegalStateException;
import org.elasticsearch.hadoop.cfg.Settings;
import org.elasticsearch.hadoop.rest.bulk.BulkProcessor;
import org.elasticsearch.hadoop.rest.bulk.BulkResponse;
import org.elasticsearch.hadoop.rest.query.QueryUtils;
import org.elasticsearch.hadoop.rest.stats.Stats;
import org.elasticsearch.hadoop.rest.stats.StatsAware;
import org.elasticsearch.hadoop.serialization.ScrollReader;
import org.elasticsearch.hadoop.serialization.ScrollReader.Scroll;
import org.elasticsearch.hadoop.serialization.ScrollReaderConfigBuilder;
import org.elasticsearch.hadoop.serialization.builder.JdkValueReader;
import org.elasticsearch.hadoop.serialization.bulk.BulkCommands;
import org.elasticsearch.hadoop.serialization.bulk.BulkEntryWriter;
import org.elasticsearch.hadoop.serialization.bulk.MetadataExtractor;
import org.elasticsearch.hadoop.serialization.dto.NodeInfo;
import org.elasticsearch.hadoop.serialization.dto.ShardInfo;
import org.elasticsearch.hadoop.serialization.dto.mapping.FieldParser;
import org.elasticsearch.hadoop.serialization.dto.mapping.GeoField;
import org.elasticsearch.hadoop.serialization.dto.mapping.GeoField.GeoType;
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.handler.read.impl.AbortOnlyHandlerLoader;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.BytesArray;
import org.elasticsearch.hadoop.util.BytesRef;
import org.elasticsearch.hadoop.util.EsMajorVersion;
import org.elasticsearch.hadoop.util.SettingsUtils;
import org.elasticsearch.hadoop.util.StringUtils;
import org.elasticsearch.hadoop.util.unit.TimeValue;
import java.io.Closeable;
import java.io.IOException;
import java.io.InputStream;
import java.util.Collections;
import java.util.HashMap;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Map.Entry;
import static org.elasticsearch.hadoop.rest.Request.Method.POST;
/**
* Rest client performing high-level operations using buffers to improve performance. Stateful in that once created, it
* is used to perform updates against the same index.
*/
public class RestRepository implements Closeable, StatsAware {
private static Log log = LogFactory.getLog(RestRepository.class);
// wrapper around existing BA (for cases where the serialization already occurred)
private BytesRef trivialBytesRef;
private boolean writeInitialized = false;
private RestClient client;
// optional extractor passed lazily to BulkCommand
private MetadataExtractor metaExtractor;
private BulkEntryWriter bulkEntryWriter;
private BulkProcessor bulkProcessor;
// Internal
private static class Resources {
private final Settings resourceSettings;
private Resource resourceRead;
private Resource resourceWrite;
public Resources(Settings resourceSettings) {
this.resourceSettings = resourceSettings;
}
public Resource getResourceRead() {
if (resourceRead == null) {
if (StringUtils.hasText(resourceSettings.getResourceRead())) {
resourceRead = new Resource(resourceSettings, true);
}
}
return resourceRead;
}
public Resource getResourceWrite() {
if (resourceWrite == null) {
if (StringUtils.hasText(resourceSettings.getResourceWrite())) {
resourceWrite = new Resource(resourceSettings, false);
}
}
return resourceWrite;
}
}
private final Settings settings;
private Resources resources;
private final Stats stats = new Stats();
public RestRepository(Settings settings) {
this.settings = settings;
this.resources = new Resources(settings);
// Check if we have a read resource first, and if not, THEN check the write resource
// The write resource has more strict parsing rules, and if the process is only reading
// with a resource that isn't good for writing, then eagerly parsing the resource as a
// write resource can erroneously throw an error. Instead, we should just get the write
// resource lazily as needed.
Assert.isTrue(resources.getResourceRead() != null || resources.getResourceWrite() != null, "Invalid configuration - No read or write resource specified");
this.client = new RestClient(settings);
}
/** postpone writing initialization since we can do only reading so there's no need to allocate buffers */
private void lazyInitWriting() {
if (!writeInitialized) {
this.writeInitialized = true;
this.bulkProcessor = new BulkProcessor(client, resources.getResourceWrite(), settings);
this.trivialBytesRef = new BytesRef();
this.bulkEntryWriter = new BulkEntryWriter(settings, BulkCommands.create(settings, metaExtractor, client.clusterInfo.getMajorVersion()));
}
}
ScrollQuery scanAll(String query, BytesArray body, ScrollReader reader) {
return scanLimit(query, body, -1, reader);
}
/**
* Returns a pageable (scan based) result to the given query.
*
* @param query scan query
* @param reader scroll reader
* @return a scroll query
*/
ScrollQuery scanLimit(String query, BytesArray body, long limit, ScrollReader reader) {
return new ScrollQuery(this, query, body, limit, reader);
}
public void addRuntimeFieldExtractor(MetadataExtractor metaExtractor) {
this.metaExtractor = metaExtractor;
}
/**
* Writes the objects to index.
*
* @param object object to add to the index
*/
public void writeToIndex(Object object) {
Assert.notNull(object, "no object data given");
lazyInitWriting();
BytesRef serialized = bulkEntryWriter.writeBulkEntry(object);
if (serialized != null) {
doWriteToIndex(serialized);
}
}
/**
* Writes the objects to index.
*
* @param ba The data as a bytes array
*/
public void writeProcessedToIndex(BytesArray ba) {
Assert.notNull(ba, "no data given");
Assert.isTrue(ba.length() > 0, "no data given");
lazyInitWriting();
trivialBytesRef.reset();
trivialBytesRef.add(ba);
doWriteToIndex(trivialBytesRef);
}
private void doWriteToIndex(BytesRef payload) {
bulkProcessor.add(payload);
payload.reset();
}
public BulkResponse tryFlush() {
if (writeInitialized) {
return bulkProcessor.tryFlush();
} else {
log.warn("Attempt to flush before any data had been written");
return BulkResponse.complete();
}
}
public void flush() {
if (writeInitialized) {
bulkProcessor.flush();
} else {
log.warn("Attempt to flush before any data had been written");
}
}
@Override
public void close() {
if (log.isDebugEnabled()) {
log.debug("Closing repository and connection to Elasticsearch ...");
}
// bail out if closed before
if (client == null) {
return;
}
try {
if (bulkProcessor != null) {
bulkProcessor.close();
// Aggregate stats before discarding them.
stats.aggregate(bulkProcessor.stats());
bulkProcessor = null;
}
if (bulkEntryWriter != null) {
bulkEntryWriter.close();
bulkEntryWriter = null;
}
} finally {
client.close();
// Aggregate stats before discarding them.
stats.aggregate(client.stats());
client = null;
}
}
public RestClient getRestClient() {
return client;
}
public List>> getReadTargetShards() {
for (int retries = 0; retries < 3; retries++) {
List>> result = doGetReadTargetShards();
if (result != null) {
return result;
}
}
throw new EsHadoopIllegalStateException("Cluster state volatile; cannot find node backing shards - please check whether your cluster is stable");
}
protected List>> doGetReadTargetShards() {
return client.targetShards(resources.getResourceRead().index(), SettingsUtils.getFixedRouting(settings));
}
public Map getWriteTargetPrimaryShards(boolean clientNodesOnly) {
for (int retries = 0; retries < 3; retries++) {
Map map = doGetWriteTargetPrimaryShards(clientNodesOnly);
if (map != null) {
return map;
}
}
throw new EsHadoopIllegalStateException("Cluster state volatile; cannot find node backing shards - please check whether your cluster is stable");
}
protected Map doGetWriteTargetPrimaryShards(boolean clientNodesOnly) {
List>> info = client.targetShards(resources.getResourceWrite().index(), SettingsUtils.getFixedRouting(settings));
Map shards = new LinkedHashMap();
List nodes = client.getHttpNodes(clientNodesOnly);
Map nodeMap = new HashMap(nodes.size());
for (NodeInfo node : nodes) {
nodeMap.put(node.getId(), node);
}
for (List> shardGroup : info) {
// consider only primary shards
for (Map shardData : shardGroup) {
ShardInfo shard = new ShardInfo(shardData);
if (shard.isPrimary()) {
NodeInfo node = nodeMap.get(shard.getNode());
if (node == null) {
log.warn(String.format("Cannot find node with id [%s] (is HTTP enabled?) from shard [%s] in nodes [%s]; layout [%s]", shard.getNode(), shard, nodes, info));
return null;
}
shards.put(shard, node);
break;
}
}
}
return shards;
}
public MappingSet getMappings() {
return client.getMappings(resources.getResourceRead());
}
public Map sampleGeoFields(Mapping mapping) {
Map fields = MappingUtils.geoFields(mapping);
Map geoMapping = client.sampleForFields(resources.getResourceRead(), fields.keySet());
Map geoInfo = new LinkedHashMap();
for (Entry geoEntry : fields.entrySet()) {
String fieldName = geoEntry.getKey();
geoInfo.put(fieldName, MappingUtils.parseGeoInfo(geoEntry.getValue(), geoMapping.get(fieldName)));
}
return geoInfo;
}
// used to initialize a scroll (based on a query)
Scroll scroll(String query, BytesArray body, ScrollReader reader) throws IOException {
InputStream scroll = client.execute(POST, query, body).body();
try {
Scroll scrollResult = reader.read(scroll);
if (scrollResult == null) {
log.info(String.format("No scroll for query [%s/%s], likely because the index is frozen", query, body));
} else if (settings.getInternalVersionOrThrow().onOrBefore(EsMajorVersion.V_2_X)) {
// On ES 2.X and before, a scroll response does not contain any hits to start with.
// Another request will be needed.
scrollResult = new Scroll(scrollResult.getScrollId(), scrollResult.getTotalHits(), false);
}
return scrollResult;
} finally {
if (scroll != null && scroll instanceof StatsAware) {
stats.aggregate(((StatsAware) scroll).stats());
}
}
}
// consume the scroll
Scroll scroll(String scrollId, ScrollReader reader) throws IOException {
InputStream scroll = client.scroll(scrollId);
try {
return reader.read(scroll);
} finally {
if (scroll instanceof StatsAware) {
stats.aggregate(((StatsAware) scroll).stats());
}
}
}
public boolean resourceExists(boolean read) {
Resource res = (read ? resources.getResourceRead() : resources.getResourceWrite());
// cheap hit - works for exact index names, index patterns, the `_all` resource, and alias names
boolean exists = client.indexExists(res.index());
// Do we really care if it's typed?
// Yes! If the index exists and a type is given, the type should exist on the index as well.
if (exists && res.isTyped()) {
exists = client.typeExists(res.index(), res.type());
}
// could be a _all or a pattern which is valid for read
// try again by asking the mapping - could be expensive
if (!exists && read) {
try {
// make sure the mapping is null since the index might exist but the type might be missing
MappingSet mappings = client.getMappings(res);
exists = mappings != null && !mappings.isEmpty();
} catch (EsHadoopInvalidRequest ex) {
exists = false;
}
}
return exists;
}
public boolean touch() {
return client.touch(resources.getResourceWrite().index());
}
public void delete() {
if (client.clusterInfo.getMajorVersion().on(EsMajorVersion.V_1_X)) {
// ES 1.x - delete as usual
// Delete just the mapping
client.delete(resources.getResourceWrite().index() + "/" + resources.getResourceWrite().type());
}
else {
// try first a blind delete by query (since the plugin might be installed)
try {
if (resources.getResourceWrite().isTyped()) {
client.delete(resources.getResourceWrite().index() + "/" + resources.getResourceWrite().type() + "/_query?q=*");
} else {
client.delete(resources.getResourceWrite().index() + "/_query?q=*");
}
} catch (EsHadoopInvalidRequest ehir) {
log.info("Skipping delete by query as the plugin is not installed...");
}
// in ES 2.0 and higher this means scrolling and deleting the docs by hand...
// do a scroll-scan without source
// as this is a delete, there's not much value in making this configurable so we just go for some sane/safe defaults
// 10m scroll timeout
// 250 results
int batchSize = 500;
StringBuilder sb = new StringBuilder(resources.getResourceWrite().index());
if (resources.getResourceWrite().isTyped()) {
sb.append('/').append(resources.getResourceWrite().type());
}
sb.append("/_search?scroll=10m&_source=false&size=");
sb.append(batchSize);
if (client.clusterInfo.getMajorVersion().onOrAfter(EsMajorVersion.V_5_X)) {
sb.append("&sort=_doc");
}
else {
sb.append("&search_type=scan");
}
String scanQuery = sb.toString();
ScrollReader scrollReader = new ScrollReader(
ScrollReaderConfigBuilder.builder(new JdkValueReader(), settings)
.setReadMetadata(true)
.setMetadataName("_metadata")
.setReturnRawJson(false)
.setIgnoreUnmappedFields(false)
.setIncludeFields(Collections.emptyList())
.setExcludeFields(Collections.emptyList())
.setIncludeArrayFields(Collections.emptyList())
.setErrorHandlerLoader(new AbortOnlyHandlerLoader()) // Only abort since this is internal
);
// start iterating
ScrollQuery sq = scanAll(scanQuery, null, scrollReader);
try {
BytesArray entry = new BytesArray(0);
// delete each retrieved batch, keep routing in mind:
String baseFormat = "{\"delete\":{\"_id\":\"%s\"}}\n";
String routedFormat;
if (client.clusterInfo.getMajorVersion().onOrAfter(EsMajorVersion.V_7_X)) {
routedFormat = "{\"delete\":{\"_id\":\"%s\", \"routing\":\"%s\"}}\n";
} else {
routedFormat = "{\"delete\":{\"_id\":\"%s\", \"_routing\":\"%s\"}}\n";
}
boolean hasData = false;
while (sq.hasNext()) {
hasData = true;
entry.reset();
Object[] kv = sq.next();
@SuppressWarnings("unchecked")
Map value = (Map) kv[1];
@SuppressWarnings("unchecked")
Map metadata = (Map) value.get("_metadata");
String routing = (String) metadata.get("_routing");
String encodedId = StringUtils.jsonEncoding((String) kv[0]);
if (StringUtils.hasText(routing)) {
String encodedRouting = StringUtils.jsonEncoding(routing);
entry.add(StringUtils.toUTF(String.format(routedFormat, encodedId, encodedRouting)));
} else {
entry.add(StringUtils.toUTF(String.format(baseFormat, encodedId)));
}
writeProcessedToIndex(entry);
}
if (hasData) {
flush();
// once done force a refresh
client.refresh(resources.getResourceWrite());
}
} finally {
stats.aggregate(sq.stats());
sq.close();
}
}
}
public boolean isEmpty(boolean read) {
Resource res = (read ? resources.getResourceRead() : resources.getResourceWrite());
boolean exists = client.indexExists(res.index());
return (exists ? count(read) <= 0 : true);
}
public long count(boolean read) {
Resource res = (read ? resources.getResourceRead() : resources.getResourceWrite());
if (res.isTyped()) {
return client.count(res.index(), res.type(), QueryUtils.parseQuery(settings));
} else {
return client.count(res.index(), QueryUtils.parseQuery(settings));
}
}
public boolean waitForYellow() {
return client.waitForHealth(resources.getResourceWrite().index(), RestClient.Health.YELLOW, TimeValue.timeValueSeconds(10));
}
@Override
public Stats stats() {
Stats copy = new Stats(stats);
if (client != null) {
// Aggregate stats if it's not already discarded
copy.aggregate(client.stats());
}
if (bulkProcessor != null) {
// Aggregate stats if it's not already discarded
copy.aggregate(bulkProcessor.stats());
}
return copy;
}
public Settings getSettings() {
return settings;
}
}