java - Solr 导入不执行任何操作

标签 java apache solr

我启动了 Solr 并运行了以下查询:

curl "http://localhost:8983/solr/dataimport?command=full-import&commit=true"

然后我检查了 Solr 日志缓冲区中的输出:

Jan 27, 2012 5:08:23 PM org.apache.solr.handler.dataimport.DataImporter doFullImport INFO: Starting Full Import Jan 27, 2012 5:08:23 PM org.apache.solr.core.SolrCore execute INFO: [] webapp=/solr path=/dataimport params={command=full-import&commit=true} status=0 QTime=7 Jan 27, 2012 5:08:23 PM org.apache.solr.handler.dataimport.SolrWriter readIndexerProperties INFO: Read dataimport.properties Jan 27, 2012 5:08:23 PM org.apache.solr.update.DirectUpdateHandler2 deleteAll INFO: [] REMOVING ALL DOCUMENTS FROM INDEX Jan 27, 2012 5:08:23 PM org.apache.solr.core.SolrDeletionPolicy onInit INFO: SolrDeletionPolicy.onInit: commits:num=1 commit{dir=/private/var/www/html/internsolr/solr/example/solr/data/index,segFN=segments_2b,version=1320251100997,generation=83,filenames=[segments_2b] Jan 27, 2012 5:08:23 PM org.apache.solr.core.SolrDeletionPolicy updateCommits INFO: newest commit = 1320251100997 Jan 27, 2012 5:08:23 PM org.apache.solr.handler.dataimport.JdbcDataSource$1 call INFO: Creating a connection for entity id with URL: jdbc:mysql://localhost:8983/internshipsearch

此外,XML 输出:

<?xml version="1.0" encoding="UTF-8"?>
<response>
<lst name="responseHeader"><int name="status">0</int><int name="QTime">7</int></lst><lst name="initArgs"><lst name="defaults"><str name="config">data-config.xml</str></lst></lst><str name="command">full-import</str><str name="status">idle</str><str name="importResponse"/><lst name="statusMessages"/><str name="WARNING">This response format is experimental.  It is likely to change in the future.</str>
</response>

请注意,statusMessages 节点为空。我猜这意味着没有导入任何内容,因为当我运行应用程序来查看数据时,没有加载任何内容......

以下是正确的 statusMessages block 的示例: http://digitalpbk.com/apachesolr/apache-solr-mysql-sample-data-config

更新 *大约 80 秒后出现异常*

Jan 27, 2012 5:18:23 PM org.apache.solr.common.SolrException log
SEVERE: Exception while processing: id document : SolrInputDocument[{}]:org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select respondentid,                           first_name,                           last_name,                           cmc_email_address,                           graduation_year,                           first_major,                           additional_major,                           sequence,                           other_major,                           organization_name,                           organization_website,                           organization_desc,                           industry,                           job_title,                           department,                           city,                           state,                           country,                           region,                           internship_paid,                           hourly_salary,                           year_undertaken,                           recommend_again,                           employer_supervisor,                           employer_phone,                           employer_email,                           not_recommended_desc,                           full_time_offer,                           full_time_accept,                           attend_summer_classes,                           summer_classes_institution,                           summer_classes_desc,                           summer_travel,                           summer_travel_city,                           summer_travel_state,                           summer_travel_country,                           summer_other_activity,                           summer_other_activity_desc,                           how_discovered,                           doe_start_month,                           doe_start_day,                           doe_end_month,                           doe_end_day             from interndata Processing Document # 1
    at org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow(DataImportHandlerException.java:72)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:253)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)
Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.io.EOFException

STACKTRACE:

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:501)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.

STACKTRACE:

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.io.EOFException

STACKTRACE:

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:501)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:569)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2741)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    ... 11 more

Jan 27, 2012 5:18:23 PM org.apache.solr.common.SolrException log
SEVERE: Full Import failed:org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select respondentid,                           first_name,                           last_name,                           cmc_email_address,                           graduation_year,                           first_major,                           additional_major,                           sequence,                           other_major,                           organization_name,                           organization_website,                           organization_desc,                           industry,                           job_title,                           department,                           city,                           state,                           country,                           region,                           internship_paid,                           hourly_salary,                           year_undertaken,                           recommend_again,                           employer_supervisor,                           employer_phone,                           employer_email,                           not_recommended_desc,                           full_time_offer,                           full_time_accept,                           attend_summer_classes,                           summer_classes_institution,                           summer_classes_desc,                           summer_travel,                           summer_travel_city,                           summer_travel_state,                           summer_travel_country,                           summer_other_activity,                           summer_other_activity_desc,                           how_discovered,                           doe_start_month,                           doe_start_day,                           doe_end_month,                           doe_end_day             from interndata Processing Document # 1
    at org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow(DataImportHandlerException.java:72)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:253)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)
Caused by: com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

com.mysql.jdbc.CommunicationsException
MESSAGE: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.io.EOFException

STACKTRACE:

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:501)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.

STACKTRACE:

com.mysql.jdbc.CommunicationsException: Communications link failure due to underlying exception: 

** BEGIN NESTED EXCEPTION ** 

java.io.EOFException

STACKTRACE:

java.io.EOFException
    at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:1913)
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:501)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
    at com.mysql.jdbc.MysqlIO.readPacket(MysqlIO.java:569)
    at com.mysql.jdbc.MysqlIO.doHandshake(MysqlIO.java:971)
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2670)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:210)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.initQuery(SqlEntityProcessor.java:59)
    at org.apache.solr.handler.dataimport.SqlEntityProcessor.nextRow(SqlEntityProcessor.java:73)
    at org.apache.solr.handler.dataimport.EntityProcessorWrapper.nextRow(EntityProcessorWrapper.java:238)
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:596)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:268)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:187)
    at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:359)
    at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:427)
    at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:408)


** END NESTED EXCEPTION **



Last packet sent to the server was 0 ms ago.
    at com.mysql.jdbc.Connection.createNewIO(Connection.java:2741)
    at com.mysql.jdbc.Connection.<init>(Connection.java:1531)
    at com.mysql.jdbc.NonRegisteringDriver.connect(NonRegisteringDriver.java:266)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:161)
    at org.apache.solr.handler.dataimport.JdbcDataSource$1.call(JdbcDataSource.java:128)
    at org.apache.solr.handler.dataimport.JdbcDataSource.getConnection(JdbcDataSource.java:363)
    at org.apache.solr.handler.dataimport.JdbcDataSource.access$200(JdbcDataSource.java:39)
    at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:240)
    ... 11 more

Jan 27, 2012 5:18:23 PM org.apache.solr.update.DirectUpdateHandler2 rollback
INFO: start rollback
Jan 27, 2012 5:18:23 PM org.apache.solr.update.DirectUpdateHandler2 rollback
INFO: end_rollback

最佳答案

我的问题是我的 AjaxSolr.Manager 设置不正确。默认情况下,Solr 监听端口 8983,但我让它监听 1024。以下是正确的代码片段:

Manager = new AjaxSolr.Manager({solrUrl: 'http://localhost:8983/solr/'});

关于java - Solr 导入不执行任何操作,我们在Stack Overflow上找到一个类似的问题: https://stackoverflow.com/questions/9042088/

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