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Solr Dataimporthandler 导入MySQL 内存溢出

技术库:tec.5lulu.com

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(java.lang.OutOfMemoryError:GC overhead limit exceeded), 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$1.run(DataImporter.java:464)
Caused by: java.lang.RuntimeException: org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select * from POI Processing Document # 1
    at org.apache.solr.handler.dataimport.DocBuilder.buildDocument(DocBuilder.java:418)
    at org.apache.solr.handler.dataimport.DocBuilder.doFullDump(DocBuilder.java:331)
    at org.apache.solr.handler.dataimport.DocBuilder.execute(DocBuilder.java:239)
    ... 3 more
Caused by: org.apache.solr.handler.dataimport.DataImportHandlerException: Unable to execute query: select * from POI Processing Document # 1
    at org.apache.solr.handler.dataimport.DataImportHandlerException.wrapAndThrow(DataImportHandlerException.java:71)
    at org.apache.solr.handler.dataimport.JdbcDataSource$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 more
Caused by: com.mysql.jdbc.exceptions.jdbc4.CommunicationsException: Communications link failure
 
The 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 more
Caused 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  

from:tec.5lulu.com

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。

Solr Dataimporthandler 导入MySQL 内存溢出


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