玩转大数据系列之Apache Pig如何与Apache Solr集成(二)
散仙,在上篇文章中介绍了,如何使用Apache Pig与Lucene集成,还不知道的道友们,可以先看下上篇,熟悉下具体的流程。在与Lucene集成过程中,我们发现最终还要把生成的Lucene索引,拷贝至本地磁盘,才能提供检索服务,这样以来,比较繁琐,而且有以下几个缺点:
(一)在生成索引以及最终能提供正常的服务之前,索引经过多次落地操作,这无疑会给磁盘和网络IO,带来巨大影响
(二)Lucene的Field的配置与其UDF函数的代码耦合性过强,而且提供的配置也比较简单,不太容易满足,灵活多变的检索需求和服务,如果改动索引配置,则有可能需要重新编译源码。
(三)对Hadoop的分布式存储系统HDFS依赖过强,如果使用与Lucene集成,那么则意味着你提供检索的Web服务器,则必须跟hadoop的存储节点在一个机器上,否则,无法从HDFS上下拉索引,除非你自己写程序,或使用scp再次从目标机传输,这样无疑又增加了,系统的复杂性。
鉴于有以上几个缺点,所以建议大家使用Solr或ElasticSearch这样的封装了Lucene更高级的API框架,那么Solr与ElasticSearch和Lucene相比,又有什么优点呢?
(1)在最终的写入数据时,我们可以直接最终结果写入solr或es,同时也可以在HDFS上保存一份,作为灾备。
(2)使用了solr或es,这时,我们字段的配置完全与UDF函数代码无关,我们的任何字段配置的变动,都不会影响Pig的UDF函数的代码,而在UDF函数里,唯一要做的,就是将最终数据,提供给solr和es服务。
(3)solr和es都提供了restful风格的http操作方式,这时候,我们的检索集群完全可以与Hadoop集群分离,从而让他们各自都专注自己的服务。
下面,散仙就具体说下如何使用Pig和Solr集成?
(1)依旧访问这个地址下载源码压缩包。
(2)提取出自己想要的部分,在eclipse工程中,修改定制适合自己环境的的代码(Solr版本是否兼容?hadoop版本是否兼容?,Pig版本是否兼容?)。
(3)使用ant重新打包成jar
(4)在pig里,注册相关依赖的jar包,并使用索引存储
注意,在github下载的压缩里直接提供了对SolrCloud模式的提供,而没有提供,普通模式的函数,散仙在这里稍作修改后,可以支持普通模式的Solr服务,代码如下:
SolrOutputFormat函数
Java代码
[*] package com.pig.support.solr;
[*]
[*]
[*]
[*] import java.io.IOException;
[*] import java.util.ArrayList;
[*] import java.util.List;
[*] import java.util.concurrent.Executors;
[*] import java.util.concurrent.ScheduledExecutorService;
[*] import java.util.concurrent.TimeUnit;
[*]
[*] import org.apache.hadoop.io.Writable;
[*] import org.apache.hadoop.mapreduce.JobContext;
[*] import org.apache.hadoop.mapreduce.OutputCommitter;
[*] import org.apache.hadoop.mapreduce.RecordWriter;
[*] import org.apache.hadoop.mapreduce.TaskAttemptContext;
[*] import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
[*] import org.apache.solr.client.solrj.SolrServer;
[*] import org.apache.solr.client.solrj.SolrServerException;
[*] import org.apache.solr.client.solrj.impl.CloudSolrServer;
[*] import org.apache.solr.client.solrj.impl.HttpSolrServer;
[*] import org.apache.solr.common.SolrInputDocument;
[*] /**
[*] * @author qindongliang
[*] * 支持SOlr的SolrOutputFormat
[*] * 如果你想了解,或学习更多这方面的
[*] * 知识,请加入我们的群:
[*] *
[*] * 搜索技术交流群(2000人):324714439
[*] * 大数据技术1号交流群(2000人):376932160(已满)
[*] * 大数据技术2号交流群(2000人):415886155
[*] * 微信公众号:我是攻城师(woshigcs)
[*] *
[*] * */
[*] public class SolrOutputFormat extends
[*] FileOutputFormat {
[*]
[*] final String address;
[*] final String collection;
[*]
[*] public SolrOutputFormat(String address, String collection) {
[*] this.address = address;
[*] this.collection = collection;
[*] }
[*]
[*] @Override
[*] public RecordWriter getRecordWriter(
[*] TaskAttemptContext ctx) throws IOException, InterruptedException {
[*] return new SolrRecordWriter(ctx, address, collection);
[*] }
[*]
[*]
[*] @Override
[*] public synchronized OutputCommitter getOutputCommitter(
[*] TaskAttemptContext arg0) throws IOException {
[*] return new OutputCommitter(){
[*]
[*] @Override
[*] public void abortTask(TaskAttemptContext ctx) throws IOException {
[*]
[*] }
[*]
[*] @Override
[*] public void commitTask(TaskAttemptContext ctx) throws IOException {
[*]
[*] }
[*]
[*] @Override
[*] public boolean needsTaskCommit(TaskAttemptContext arg0)
[*] throws IOException {
[*] return true;
[*] }
[*]
[*] @Override
[*] public void setupJob(JobContext ctx) throws IOException {
[*]
[*] }
[*]
[*] @Override
[*] public void setupTask(TaskAttemptContext ctx) throws IOException {
[*]
[*] }
[*]
[*]
[*] };
[*] }
[*]
[*]
[*] /**
[*] * Write out the LuceneIndex to a local temporary location.
[*] * On commit/close the index is copied to the hdfs output directory.
[*] *
[*] */
[*] static class SolrRecordWriter extends RecordWriter {
[*] /**Solr的地址*/
[*] SolrServer server;
[*] /**批处理提交的数量**/
[*] int batch = 5000;
[*]
[*] TaskAttemptContext ctx;
[*]
[*] List docs = new ArrayList(batch);
[*] ScheduledExecutorService exec = Executors.newSingleThreadScheduledExecutor();
[*] /**
[*] * Opens and forces connect to CloudSolrServer
[*] *
[*] * @param address
[*] */
[*] public SolrRecordWriter(final TaskAttemptContext ctx, String address, String collection) {
[*] try {
[*] this.ctx = ctx;
[*] server = new HttpSolrServer(address);
[*]
[*] exec.scheduleWithFixedDelay(new Runnable(){
[*] public void run(){
[*] ctx.progress();
[*] }
[*] }, 1000, 1000, TimeUnit.MILLISECONDS);
[*] } catch (Exception e) {
[*] RuntimeException exc = new RuntimeException(e.toString(), e);
[*] exc.setStackTrace(e.getStackTrace());
[*] throw exc;
[*] }
[*] }
[*]
[*]
[*] /**
[*] * On close we commit
[*] */
[*] @Override
[*] public void close(final TaskAttemptContext ctx) throws IOException,
[*] InterruptedException {
[*]
[*] try {
[*]
[*] if (docs.size() > 0) {
[*] server.add(docs);
[*] docs.clear();
[*] }
[*]
[*] server.commit();
[*] } catch (SolrServerException e) {
[*] RuntimeException exc = new RuntimeException(e.toString(), e);
[*] exc.setStackTrace(e.getStackTrace());
[*] throw exc;
[*] } finally {
[*] server.shutdown();
[*] exec.shutdownNow();
[*] }
[*]
[*] }
[*]
[*] /**
[*] * We add the indexed documents without commit
[*] */
[*] @Override
[*] public void write(Writable key, SolrInputDocument doc)
[*] throws IOException, InterruptedException {
[*] try {
[*] docs.add(doc);
[*] if (docs.size() >= batch) {
[*] server.add(docs);
[*] docs.clear();
[*] }
[*] } catch (SolrServerException e) {
[*] RuntimeException exc = new RuntimeException(e.toString(), e);
[*] exc.setStackTrace(e.getStackTrace());
[*] throw exc;
[*] }
[*] }
[*]
[*] }
[*] }
SolrStore函数
Java代码
[*] package com.pig.support.solr;
[*]
[*]
[*]
[*] import java.io.IOException;
[*] import java.util.Properties;
[*]
[*] import org.apache.hadoop.fs.Path;
[*] import org.apache.hadoop.io.Writable;
[*] import org.apache.hadoop.mapreduce.Job;
[*] import org.apache.hadoop.mapreduce.OutputFormat;
[*] import org.apache.hadoop.mapreduce.RecordWriter;
[*] import org.apache.hadoop.mapreduce.lib.output.FileOutputFormat;
[*] import org.apache.pig.ResourceSchema;
[*] import org.apache.pig.ResourceSchema.ResourceFieldSchema;
[*] import org.apache.pig.ResourceStatistics;
[*] import org.apache.pig.StoreFunc;
[*] import org.apache.pig.StoreMetadata;
[*] import org.apache.pig.data.Tuple;
[*] import org.apache.pig.impl.util.UDFContext;
[*] import org.apache.pig.impl.util.Utils;
[*] import org.apache.solr.common.SolrInputDocument;
[*]
[*] /**
[*] *
[*] * Create a lucene index
[*] *
[*] */
[*] public class SolrStore extends StoreFunc implements StoreMetadata {
[*]
[*] private static final String SCHEMA_SIGNATURE = "solr.output.schema";
[*]
[*] ResourceSchema schema;
[*] String udfSignature;
[*] RecordWriter writer;
[*]
[*] String address;
[*] String collection;
[*]
[*] public SolrStore(String address, String collection) {
[*] this.address = address;
[*] this.collection = collection;
[*] }
[*]
[*] public void storeStatistics(ResourceStatistics stats, String location,
[*] Job job) throws IOException {
[*] }
[*]
[*] public void storeSchema(ResourceSchema schema, String location, Job job)
[*] throws IOException {
[*] }
[*]
[*] @Override
[*] public void checkSchema(ResourceSchema s) throws IOException {
[*] UDFContext udfc = UDFContext.getUDFContext();
[*] Properties p = udfc.getUDFProperties(this.getClass(),
[*] new String[] { udfSignature });
[*] p.setProperty(SCHEMA_SIGNATURE, s.toString());
[*] }
[*]
[*] public OutputFormat getOutputFormat()
[*] throws IOException {
[*] // not be used
[*] return new SolrOutputFormat(address, collection);
[*] }
[*]
[*] /**
[*] * Not used
[*] */
[*] @Override
[*] public void setStoreLocation(String location, Job job) throws IOException {
[*] FileOutputFormat.setOutputPath(job, new Path(location));
[*] }
[*]
[*] @Override
[*] public void setStoreFuncUDFContextSignature(String signature) {
[*] this.udfSignature = signature;
[*] }
[*]
[*] @SuppressWarnings({ "unchecked", "rawtypes" })
[*] @Override
[*] public void prepareToWrite(RecordWriter writer) throws IOException {
[*] this.writer = writer;
[*] UDFContext udc = UDFContext.getUDFContext();
[*] String schemaStr = udc.getUDFProperties(this.getClass(),
[*] new String[] { udfSignature }).getProperty(SCHEMA_SIGNATURE);
[*]
[*] if (schemaStr == null) {
[*] throw new RuntimeException("Could not find udf signature");
[*] }
[*]
[*] schema = new ResourceSchema(Utils.getSchemaFromString(schemaStr));
[*]
[*] }
[*]
[*] /**
[*] * Shamelessly copied from : https://issues.apache.org/jira/secure/attachment/12484764/NUTCH-1016-2.0.patch
[*] * @param input
[*] * @return
[*] */
[*] private static String stripNonCharCodepoints(String input) {
[*] StringBuilder retval = new StringBuilder(input.length());
[*] char ch;
[*]
[*] for (int i = 0; i < input.length(); i++) {
[*] ch = input.charAt(i);
[*]
[*] // Strip all non-characters
[*] // http://unicode.org/cldr/utility/list-unicodeset.jsp?a=[:Noncharacter_Code_Point=True:]
[*] // and non-printable control characters except tabulator, new line
[*] // and carriage return
[*] if (ch % 0x10000 != 0xffff && // 0xffff - 0x10ffff range step
[*] // 0x10000
[*] ch % 0x10000 != 0xfffe && // 0xfffe - 0x10fffe range
[*] (ch = 0xfdef) && // 0xfdd0 - 0xfdef
[*] (ch > 0x1F || ch == 0x9 || ch == 0xa || ch == 0xd)) {
[*]
[*] retval.append(ch);
[*] }
[*] }
[*]
[*] return retval.toString();
[*] }
[*]
[*] @Override
[*] public void putNext(Tuple t) throws IOException {
[*]
[*] final SolrInputDocument doc = new SolrInputDocument();
[*]
[*] final ResourceFieldSchema[] fields = schema.getFields();
[*] int docfields = 0;
[*]
[*] for (int i = 0; i < fields.length; i++) {
[*] final Object value = t.get(i);
[*]
[*] if (value != null) {
[*] docfields++;
[*] doc.addField(fields.getName().trim(), stripNonCharCodepoints(value.toString()));
[*] }
[*]
[*] }
[*]
[*] try {
[*] if (docfields > 0)
[*] writer.write(null, doc);
[*] } catch (InterruptedException e) {
[*] Thread.currentThread().interrupt();
[*] return;
[*] }
[*]
[*] }
[*]
[*] }
Pig脚本如下:
Java代码
[*] --注册依赖文件的jar包
[*] REGISTER ./dependfiles/tools.jar;
[*]
[*] --注册solr相关的jar包
[*] REGISTER./solrdependfiles/pigudf.jar;
[*] REGISTER./solrdependfiles/solr-core-4.10.2.jar;
[*] REGISTER./solrdependfiles/solr-solrj-4.10.2.jar;
[*] REGISTER./solrdependfiles/httpclient-4.3.1.jar
[*] REGISTER./solrdependfiles/httpcore-4.3.jar
[*] REGISTER./solrdependfiles/httpmime-4.3.1.jar
[*] REGISTER./solrdependfiles/noggit-0.5.jar
[*]
[*]
[*] --加载HDFS数据,并定义scheaml
[*] a = load '/tmp/data' using PigStorage(',') as (sword:chararray,scount:int);
[*]
[*] --存储到solr中,并提供solr的ip地址和端口号
[*] store d into '/user/search/solrindextemp'using com.pig.support.solr.SolrStore('http://localhost:8983/solr/collection1','collection1');
[*] ~
[*] ~
[*] ~
配置成功之后,我们就可以运行程序,加载HDFS上数据,经过计算处理之后,并将最终的结果,存储到Solr之中,截图如下:
成功之后,我们就可以很方便的在solr中进行毫秒级别的操作了,例如各种各样的全文查询,过滤,排序统计等等!
同样的方式,我们也可以将索引存储在ElasticSearch中,关于如何使用Pig和ElasticSearch集成,散仙也会在后面的文章中介绍,敬请期待!
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