Hive 可以递归地进入没有分区或编辑 hive-site.xml 的子目录吗?

问题描述

我有一些我想用 Hive 查询的 Web 服务器日志.HDFS 中的目录结构如下所示:

I have some web server logs that I'd like to query with Hive. The directory structure, in HDFS, looks like this:

/data/access/web1/2014/09
/data/access/web1/2014/09/access-20140901.log
[... etc ...]
/data/access/web1/2014/10
/data/access/web1/2014/10/access-20141001.log
[... etc ...]
/data/access/web2/2014/09
/data/access/web2/2014/09/access-20140901.log
[... etc ...]
/data/access/web2/2014/10
/data/access/web2/2014/10/access-20141001.log
[... etc ...]

我可以创建一个外部表:

I'm able to create an external table:

CREATE EXTERNAL TABLE access(
  host STRING,
  identity STRING,
  user STRING,
  time STRING,
  request STRING,
  status STRING,
  size STRING,
  referer STRING,
  agent STRING)
ROW FORMAT SERDE 'org.apache.hadoop.hive.contrib.serde2.RegexSerDe'
WITH SERDEPROPERTIES (
  "input.regex" = "([^ ]*) ([^ ]*) ([^ ]*) (-|\[[^\]]*\]) ([^ "]*|"[^"]*") (-|[0-9]*) (-|[0-9]*)(?: ([^ "]*|"[^"]*") ([^ "]*|"[^"]*"))?",
  "output.format.string" = "%1$s %2$s %3$s %4$s %5$s %6$s %7$s %8$s %9$s")
LOCATION '/data/access/'

...尽管 Hive 不会进入子文件夹，除非我在运行 Hive 查询之前运行以下命令:

... though Hive doesn't descend into the subfolders unless I run the following commands before running the Hive query:

set hive.input.dir.recursive=true;
set hive.mapred.supports.subdirectories=true;
set hive.supports.subdirectories=true;
set mapred.input.dir.recursive=true;

我看到其他帖子在表级别设置这些属性(例如 使用 tblproperties 创建 Hive 外部表的问题):

I've seen other posts set these properties at the table-level (e.g. Issue creating Hive External table using tblproperties):

TBLPROPERTIES ("hive.input.dir.recursive" = "TRUE",
    "hive.mapred.supports.subdirectories" = "TRUE",
    "hive.supports.subdirectories" = "TRUE",
    "mapred.input.dir.recursive" = "TRUE");

不幸的是，这对我不起作用:当我查询该表时，它没有返回任何记录.我知道可以在 hive-site.xml 中设置这些属性，但如果我不需要，我宁愿不要进行任何可能影响其他用户的更改.

Unfortunately, this didn't work for me: the table doesn't return any records when I query it. I understand it's possible to set these properties in hive-site.xml, but I'd rather not make any changes that might impact other users if I don't need to.

Q) 有没有一种方法可以在不使用分区、进行站点范围的更改或每次运行这 4 个命令的情况下创建一个下降到子目录的表?

Q) is there a way to create a table that descends into the subdirectories without using partitions, making site-wide changes, or running those 4 commands every time?

推荐答案

在 HDInsight 中使用 Hive，我在 Hive 查询中创建外部表之前设置了以下属性，它适用于我.

Using Hive in HDInsight, I set the following properties before I create my external table in the Hive query and it works for me.

SET hive.mapred.supports.subdirectories=TRUE;
SET mapred.input.dir.recursive=TRUE;

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