基于Solr DIH实现MySQL表数据全量索引和增量索引

实现MySQL表数据全量索引和增量索引,基于Solr DIH组件实现起来比较简单,只需要重复使用Solr的DIH(Data Import Handler)组件,对data-config.xml进行简单的修改即可。Solr DIH组件的实现类为org.apache.solr.handler.dataimport.DataImportHandler,在Solr的solrconfig.xml中配置两个handler,配置分别说明如下。


全量索引


solrconfig.xml配置如下:


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<requestHandler name="/dataimport"

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     class="org.apache.solr.handler.dataimport.DataImportHandler">

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     <lst name="defaults">

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          <str name="config">data-config.xml</str>

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     </lst>

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</requestHandler>

上面这个是针对全量索引的,主要是配置data-config.xml文件,示例如下所示:


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<dataConfig>

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    <dataSource name="jdbc" driver="com.mysql.jdbc.Driver"

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        url="jdbc:mysql://172.0.8.249:5606/marketing_db_saved?zeroDateTimeBehavior=convertToNull"

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        user="developer" password="[email protected]"/>

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    <document name="mkt_data">

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        <entity name="marketing_data" pk="id"

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                query="select * from marketing_data limit ${dataimporter.request.length} offset ${dataimporter.request.offset}"

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                transformer="RegexTransformer">

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            <field column="id" name="id" />

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            <field column="domain" name="domain" />

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            <field column="alex_rank" name="alex_rank" />

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            <field column="server_port" name="server_port" />

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            <field column="cert_validity_notBefore" name="cert_validity_notBefore" />

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            <field column="cert_validity_notAfter" />

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            <field column="cert_validity_notAfter_yyyyMMdd" regex="(.*?)\s+.*" name="cert_validity_notAfter_yyyyMMdd" sourceColName="cert_validity_notAfter"/>

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            <field column="cert_issuer_brand" name="cert_issuer_brand" />

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            <field column="cert_validation" name="cert_validation" />

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            <field column="cert_isMultiDomain" name="cert_isMultiDomain" />

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            <field column="cert_issuer_brand_isXRelated" name="cert_issuer_brand_isXRelated" />

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            <field column="cert_isWildcard" name="cert_isWildcard" />

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            <field column="cert_notAfter" name="cert_notAfter" />

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            <field column="special_ssl" name="special_ssl" />

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            <field column="competitor_logo" name="competitor_logo" />

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            <field column="segment" name="segment" />

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        </entity>

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    </document>

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</dataConfig>

上面主要是通过内置变量 “${dataimporter.request.length}”和 “${dataimporter.request.offset}”来设置一个批次索引的数据表记录数,请求的URL示例如下:


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http://172.0.8.212:8080/search-server/core0/dataimport?command=full-import&commit=true&clean=false&offset=1000000&length=100000

上面表示,对数据表中id范围为[10000000, 1100000]的记录进行索引,因为数据表可能达到千万记录数,而且线上有业务在操作数据库,所以要选择分批进行索引。


增量索引


solrconfig.xml配置如下:


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   <requestHandler name="/deltaimport" class="org.apache.solr.handler.dataimport.DataImportHandler">

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        <lst name="defaults">

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          <str name="config">delta-data-config.xml</str>

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        </lst>

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   </requestHandler>

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上面定义请求的接口为“deltaimport”,对应的配置文件delta- data-config.xml内容如下所示:

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 <dataConfig>

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    <dataSource name="jdbc" driver="com.mysql.jdbc.Driver"

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        url="jdbc:mysql://172.0.8.249:5606/marketing_db_saved?zeroDateTimeBehavior=convertToNull"

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        user="developer" password="[email protected]"/>

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    <document name="mkt_data">

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        <entity name="marketing_data" pk="id"

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                query="select * from marketing_data"

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                deltaImportQuery="select * from marketing_data where id='${dih.delta.id}'"

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                deltaQuery="select id from marketing_data where updated_at &gt; '${dih.last_index_time}'"

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                transformer="RegexTransformer">

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            <field column="id" name="id" />

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            <field column="domain" name="domain" />

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            <field column="alex_rank" name="alex_rank" />

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            <field column="server_port" name="server_port" />

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            <field column="cert_validity_notBefore" name="cert_validity_notBefore" />

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            <field column="cert_validity_notAfter" />

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            <field column="cert_validity_notAfter_yyyyMMdd" regex="(.*?)\s+.*" name="cert_validity_notAfter_yyyyMMdd" sourceColName="cert_validity_notAfter"/>

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            <field column="cert_issuer_brand" name="cert_issuer_brand" />

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            <field column="cert_validation" name="cert_validation" />

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            <field column="cert_isMultiDomain" name="cert_isMultiDomain" />

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            <field column="cert_issuer_brand_isXRelated" name="cert_issuer_brand_isXRelated" />

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            <field column="cert_isWildcard" name="cert_isWildcard" />

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            <field column="cert_notAfter" name="cert_notAfter" />

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            <field column="special_ssl" name="special_ssl" />

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            <field column="competitor_logo" name="competitor_logo" />

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            <field column="segment" name="segment" />

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        </entity>

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    </document>

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</dataConfig>

上面主要是通过内置变量“${dih.delta.id}”和 “${dih.last_index_time}”来记录本次索引的id和最后索引时间。这里,会保存在deltaimport.properties文件中,示例如下:


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#Sat Feb 16 17:48:49 CST 2013

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last_index_time=2013-02-16 17\:48\:48

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marketing_data.last_index_time=2013-02-16 17\:48\:48

请求增量索引的接口为“deltaimport”,可以写一个定时脚本,例如每隔一天执行一次 (一天索引一次,只索引数据表中更新的记录),请求URL示例如下:


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172.0.8.212:8080/search-server/core0/dataimport?command=delta-import

有关“query”,“deltaImportQuery”, “deltaQuery”的解释,引用官网说明,如下所示:


The query gives the data needed to populate fields of the Solr document in full-import

The deltaImportQuery gives the data needed to populate fields when running a delta-import

The deltaQuery gives the primary keys of the current entity which have changes since the last index time

还有更灵活的索引方式,以后再讲。


参考链接


http://wiki.apache.org/solr/DataImportHandler#Using_delta-import_command

http://www.myexception.cn/other/669522.html

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