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[Java教程]Solr Dataimporthandler 导入MySQL 内存溢出。


  最近准备把一千九百多万数据导入Solr中,在以前测试数据只有一两百万,全量导入没有任务问题。但是,换成一千九百万数据时,solr报内存异常,整个tomcat无法使用。我发现,我给tomcat最大堆内存512M。我觉得,可能是内存过小,于是,我把内存改大些,1024M(set JAVA_OPTS=-server -Xms1024m -Xmx1024m -XX:PermSize=128M -XX:MaxPermSize=256M )。结果,还是内存溢出。我想已经不是tomcat内存的问题(当然,如果你的内存足够大,也是可行的)。问题,应该出在solr的dataimporthandler取数据那块。solr除了内存溢出错误,还有其他异常:

  

Full Import failed:java.lang.RuntimeException: java.lang.RuntimeException: org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select * from POI Processing Document # 1	at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:278)	at org.apache.solr.handler.dataimport.DataImporter.doFullImport(DataImporter.java:411)	at org.apache.solr.handler.dataimport.DataImporter.runCmd(DataImporter.java:483)	at org.apache.solr.handler.dataimport.DataImporter$1.run(DataImporter.java:464)Caused by: java.lang.RuntimeException: org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select * from POI Processing Document # 1	at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:418)	at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:331)	at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:239)	... 3 moreCaused by: org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select * from POI Processing Document # 1	at org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow(DataImportHandlerException.java:71)	at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:281)	at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:238)	at org.apache.solr.handler.dataimport.JdbcDataSource.getData(JdbcDataSource.java:42)	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:243)	at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:477)	at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:416)	... 5 moreCaused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failureThe last packet successfully received from the server was 395,021 milliseconds ago. The last packet sent successfully to the server was 395,021 milliseconds ago.	at sun.reflect.NativeConstructorAccessorImpl.newInstance0(Native Method)	at sun.reflect.NativeConstructorAccessorImpl.newInstance(NativeConstructorAccessorImpl.java:57)	at sun.reflect.DelegatingConstructorAccessorImpl.newInstance(DelegatingConstructorAccessorImpl.java:45)	at java.lang.reflect.Constructor.newInstance(Constructor.java:526)	at com.mysql.jdbc.Util.handleNewInstance(Util.java:406)	at com.mysql.jdbc.SQLError.createCommunicationsException(SQLError.java:1074)	at com.mysql.jdbc.MysqlIO.nextRowFast(MysqlIO.java:1653)	at com.mysql.jdbc.MysqlIO.nextRow(MysqlIO.java:1409)	at com.mysql.jdbc.MysqlIO.readSingleRowSet(MysqlIO.java:2883)	at com.mysql.jdbc.MysqlIO.getResultSet(MysqlIO.java:476)	at com.mysql.jdbc.MysqlIO.readResultsForQueryOrUpdate(MysqlIO.java:2576)	at com.mysql.jdbc.MysqlIO.readAllResults(MysqlIO.java:1757)	at com.mysql.jdbc.MysqlIO.sqlQueryDirect(MysqlIO.java:2167)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2637)	at com.mysql.jdbc.ConnectionImpl.execSQL(ConnectionImpl.java:2566)	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:782)	at com.mysql.jdbc.StatementImpl.execute(StatementImpl.java:625)	at org.apache.solr.handler.dataimport.JdbcDataSource$ResultSetIterator.<init>(JdbcDataSource.java:274)	... 12 moreCaused by: java.io.EOFException: Can not read response from server. Expected to read 39 bytes, read 30 bytes before connection was unexpectedly lost.	at com.mysql.jdbc.MysqlIO.readFully(MysqlIO.java:2497)	at com.mysql.jdbc.MysqlIO.nextRowFast(MysqlIO.java:1634)	... 23 more

  我搜索了一下Solr的wiki,了解到solr jdbc取数据时,setBatchSize的问题。默认,会把很多数据放到内存中,这也是导致我的内存居高不下,后来导致内存溢出的原因。于是,我修改dataimporthandler配置文件:batchSize="-1" 解决内存溢出  

  配置文件修改如下:

      <dataSource driver="com.mysql.jdbc.Driver" url="jdbc:mysql://localhost:3306/world" user="root" password="root" batchSize="-1" />

  重启一个solr的core,重新导入,问题解决。