Question

testdb=# CREATE EXTERNAL TABLE sales_fact_1997 (                                                                                                                                                                                                    product_id int,                                                                                                                                                                                                                             time_id int,                                                                                                                                                                                                                                customer_id int,                                                                                                                                                                                                                            promotion_id int,                                                                                                                                                                                                                           store_id int,                                                                                                                                                                                                                               store_sales decimal,                                                                                                                                                                                                                        store_cost decimal,                                                                                                                                                                                                                         unit_sales decimal                                                                                                                                                                                                                          )                                                                                                                                                                                                                                      LOCATION ('gphdfs://hz-cluster2/user/nrpt/hive-server/foodmart.db/sales_fact_1997')                                                                                                                                                         FORMAT 'TEXT' (DELIMITER ',');
CREATE EXTERNAL TABLE

testdb=# 

testdb=# 

testdb=# 

testdb=# select * from sales_fact_1997 ;                                                                                                                                                                                                    
ERROR:  external table gphdfs protocol command ended with error. Error occurred during initialization of VM  (seg0 slice1 sdw1:40000 pid=3450)
DETAIL:  

Could not reserve enough space for object heap
Could not create the Java virtual machine.
Command: 'gphdfs://le/user/nrpt/hive-server/foodmart.db/sales_fact_1997'
External table sales_fact_1997, file gphdfs://hz-cluster2/user/nrpt/hive-server/foodmart.db/sales_fact_1997

我从hadoop-2.5.2 / etc / hadoop / hadoop-env.sh文件中更改了-Xmx的值，我看到可用的内存足够JVM。但我仍然得到这个错误。如下

@localhost ~]$ free -m
export GP_JAVA_OPT='-Xms20m -Xmx20m -XX:+DisplayVMOutputToStderr'


              total        used        free      shared  buff/cache   available
Mem:            993         114         393         219         485         518
Swap:           819           0         819

谁可以帮助我，我创建了EXTERNAL TABLE成功，但我无法从hdfs读取数据。

Answer 1

您的段主机上没有足够的内存，或者您需要为JVM分配更多内存。以下是如何为gphdfs配置JVM： http://gpdb.docs.pivotal.io/4380/admin_guide/load/topics/g-gphdfs-jvm.html

外部表gphdfs协议命令以错误结束。 VM初始化期间发生错误

1 个答案: