![](/img/trans.png)
[英]Drop Hive Table & msck repair fails with Table stored in google cloud bucket
[英]Apache hive MSCK REPAIR TABLE new partition not added
我是Apache Hive的新手。 在外部表分區上工作時,如果我將新分區直接添加到HDFS,則在運行MSCK REPAIR表后不會添加新分區。 以下是我嘗試過的代碼,
-創建外部表
hive> create external table factory(name string, empid int, age int) partitioned by(region string)
> row format delimited fields terminated by ',';
-詳細表信息
Location: hdfs://localhost.localdomain:8020/user/hive/warehouse/factory
Table Type: EXTERNAL_TABLE
Table Parameters:
EXTERNAL TRUE
transient_lastDdlTime 1438579844
-在HDFS中創建目錄以加載表工廠的數據
[cloudera@localhost ~]$ hadoop fs -mkdir 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory1'
[cloudera@localhost ~]$ hadoop fs -mkdir 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory2'
-表數據
cat factory1.txt
emp1,500,40
emp2,501,45
emp3,502,50
cat factory2.txt
EMP10,200,25
EMP11,201,27
EMP12,202,30
-從本地復制到HDFS
[cloudera@localhost ~]$ hadoop fs -copyFromLocal '/home/cloudera/factory1.txt' 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory1'
[cloudera@localhost ~]$ hadoop fs -copyFromLocal '/home/cloudera/factory2.txt' 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory2'
-更改表以在metastore中更新
hive> alter table factory add partition(region='southregion') location '/user/hive/testing/testing1/factory2';
hive> alter table factory add partition(region='northregion') location '/user/hive/testing/testing1/factory1';
hive> select * from factory;
OK
emp1 500 40 northregion
emp2 501 45 northregion
emp3 502 50 northregion
EMP10 200 25 southregion
EMP11 201 27 southregion
EMP12 202 30 southregion
現在,我創建了新文件factory3.txt以添加為表工廠的新分區
cat factory3.txt
user1,100,25
user2,101,27
user3,102,30
-創建路徑並復制表數據
[cloudera@localhost ~]$ hadoop fs -mkdir 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory2'
[cloudera@localhost ~]$ hadoop fs -copyFromLocal '/home/cloudera/factory3.txt' 'hdfs://localhost.localdomain:8020/user/hive/testing/testing1/factory3'
現在,我執行以下查詢來更新添加了新分區的元存儲
MSCK REPAIR TABLE factory;
現在,該表未提供factory3文件的新分區內容。 在為表工廠添加分區時,我可以知道我在哪里做錯了嗎?
相反,如果我運行alter命令,它將顯示新的分區數據。
hive> alter table factory add partition(region='eastregion') location '/user/hive/testing/testing1/factory3';
我能知道為什么MSCK REPAIR TABLE命令不起作用嗎?
為了使MSCK
正常工作,應使用命名約定/partition_name=partition_value/
。
您必須將數據放在表位置目錄中名為“ region = eastregio”的目錄中:
$ hadoop fs -mkdir 'hdfs://localhost.localdomain:8020/user/hive/warehouse/factory/region=eastregio'
$ hadoop fs -copyFromLocal '/home/cloudera/factory3.txt' 'hdfs://localhost.localdomain:8020/user/hive/warehouse/factory/region=eastregio'
聲明:本站的技術帖子網頁,遵循CC BY-SA 4.0協議,如果您需要轉載,請注明本站網址或者原文地址。任何問題請咨詢:yoyou2525@163.com.