java.lang.outofmemoryerror:带有配置单元的java堆空间

cyvaqqii  于 2021-05-30  发布在  Hadoop
关注(0)|答案(3)|浏览(502)

我使用了hadoop hive 0.9.0和1.1.2以及netbeans,但我遇到了此错误,无法解决此问题请帮助我编写代码:

public class Hive_test {

private static String driverName = "org.apache.hadoop.hive.jdbc.HiveDriver";

   @SuppressWarnings("CallToThreadDumpStack")
public static void main(String[] args) throws SQLException {
    try {
        Class.forName(driverName);
    } catch (ClassNotFoundException e){
        e.printStackTrace();
        System.exit(1);
    }
            System.out.println("commencer la connexion");
    Connection con = DriverManager.getConnection("jdbc:hive://localhost:10000/default",""," ");
    Statement stmt = con.createStatement();
    ResultSet res = stmt.executeQuery("select * from STATE");
    while (res.next()){
        System.out.println(String.valueOf(res.getInt(1)) + "\t" + res.getString(2));
                    System.out.println("sql terminer");
    }
}

以下错误;

error :
commencer la connexion
Exception in thread "main" java.lang.OutOfMemoryError: Java heap space
    at org.apache.thrift.protocol.TBinaryProtocol.readStringBody(TBinaryProtocol.java:353)
    at org.apache.thrift.protocol.TBinaryProtocol.readMessageBegin(TBinaryProtocol.java:215)
    at org.apache.thrift.TServiceClient.receiveBase(TServiceClient.java:69)
    at org.apache.hadoop.hive.service.ThriftHive$Client.recv_execute(ThriftHive.java:116)
    at org.apache.hadoop.hive.service.ThriftHive$Client.execute(ThriftHive.java:103)
    at org.apache.hadoop.hive.jdbc.HiveStatement.executeQuery(HiveStatement.java:192)
    at org.apache.hadoop.hive.jdbc.HiveStatement.execute(HiveStatement.java:132)
    at org.apache.hadoop.hive.jdbc.HiveConnection.configureConnection(HiveConnection.java:132)
    at org.apache.hadoop.hive.jdbc.HiveConnection.<init>(HiveConnection.java:122)
    at org.apache.hadoop.hive.jdbc.HiveDriver.connect(HiveDriver.java:106)
    at java.sql.DriverManager.getConnection(DriverManager.java:571)
    at java.sql.DriverManager.getConnection(DriverManager.java:215)
    at hive.Hive_test.main(Hive_test.java:22)
j91ykkif

j91ykkif1#

对我来说,下面的解决方案是有效的。
在启动配置单元cli之前,请使用 export HADOOP_CLIENT_OPTS=" -Xmx8192m" 然后启动cli

6mzjoqzu

6mzjoqzu2#

嗯,就我而言,我还需要设置内存 java.opts ```
set mapreduce.map.memory.mb=4096;
set mapreduce.map.java.opts=-Xmx3686m;
set mapreduce.reduce.memory.mb=4096;
set mapreduce.reduce.java.opts=-Xmx3686m;

stszievb

stszievb3#

您可以在配置单元中设置容器堆化并解决此错误:
大多数在hadoopmapreduce框架上运行的工具都提供了为其作业调优这些hadoop级别设置的方法。在Hive中有多种方法可以做到这一点。这里显示了其中三个:
1) 通过配置单元命令行直接传递:

hive -hiveconf mapreduce.map.memory.mb=4096 -hiveconf mapreduce.reduce.memory.mb=5120 -e "select count(*) from test_table;"

2) 在调用配置单元之前设置env变量:

export HIVE_OPTS="-hiveconf mapreduce.map.memory.mb=4096 -hiveconf mapreduce.reduce.memory.mb=5120"

3) 在配置单元cli中使用“set”命令。

hive> set mapreduce.map.memory.mb=4096;
hive> set mapreduce.reduce.memory.mb=5120;
hive> select count(*) from test_table;

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