Home | About | Sematext search-lucene.com search-hadoop.com
 Search Hadoop and all its subprojects:

Switch to Plain View
Hive >> mail # user >> Re: dfs storage full on all slave machines of 6 machine hive cluster


+
Manish Bhoge 2013-03-18, 10:48
+
Zhiwen Sun 2013-03-18, 15:10
+
Chunky Gupta 2013-03-18, 15:58
+
Alok Kumar 2013-03-18, 16:46
+
Chunky Gupta 2013-03-19, 10:36
Copy link to this message
-
Re: dfs storage full on all slave machines of 6 machine hive cluster
Hi,

1. For a table size in Hive :
$hive> describe extended <*tableName*>
** look for *location* tag in output **
run this *bin/hadoop dfs -du <hive-table-location>* at $HADOOP_HOME
directory to get the table size.
(It won't hold true for EXTENDED tables; Also not sure about size of any
database; )

2. HDFS stores data in distributed manner. It is difficult to get the
actual block location.
 ( A single table data could be spread across all 5 nodes )

Thanks,

On Tue, Mar 19, 2013 at 4:06 PM, Chunky Gupta <[EMAIL PROTECTED]>wrote:

> Thank Alok, I deleted mapred.local.dir folders.
> I more 2 question,
>
> 1. I have around 30 databases and each one contains many tables. So, is
> there any way to find out wat are the size of each database or how much
> storage a particular table in a database is occupying.
>
> 2. We have 5 slave nodes, how to find which tables data is stored on which
> slave node .
>
> Thanks,
> Chunky.
>
>
>
> On Mon, Mar 18, 2013 at 10:16 PM, Alok Kumar <[EMAIL PROTECTED]> wrote:
>
>> Look into your hdfs-site.xml & mapred-site.xml conf files.
>>
>> *dfs.data.dir* propety contain your actual HDFS data path, better avoid
>> deleting anything from these directories.
>>
>> *mapred.local.dir* contains temporary map-reduce job data, you can clean
>> this one.
>>
>> "/mnt/hadoop-fs/dfs/data/current/" looks like your hdfs data path, this
>> mean your hive tables have grown to ~95% of your disk size. try deleting
>> hive tables or add more disk ( dropping a EXTERNAL hive table doesn't clear
>> the data from HDFS)
>>
>> Thanks,
>>
>>
>> On Mon, Mar 18, 2013 at 9:28 PM, Chunky Gupta <[EMAIL PROTECTED]>wrote:
>>
>>> Hi Zhiwen,
>>>
>>> /mnt/hadoop-fs/mapred/local/taskTracker/
>>>
>>> Inside this folder there are folders with different user name, can I
>>> delete these ?.
>>>
>>> I do not understand what this {*nouserdir*} you were talking about, can
>>> you please explain ?.
>>>
>>> Thanks,
>>> Chunky.
>>>
>>>
>>>
>>> On Mon, Mar 18, 2013 at 8:40 PM, Zhiwen Sun <[EMAIL PROTECTED]> wrote:
>>>
>>>> The folder "/mnt/hadoop-fs/dfs/data/current/" is the main folder of
>>>> datanode in hadoop.
>>>>
>>>> You can use *hadoop dfs -rmr {nouserdir} *to get more free space in
>>>> HDFS.
>>>>
>>>> *Don't delete file directly in OS file system.*
>>>>
>>>> Zhiwen Sun
>>>>
>>>>
>>>>
>>>> On Mon, Mar 18, 2013 at 6:48 PM, Manish Bhoge <
>>>> [EMAIL PROTECTED]> wrote:
>>>>
>>>>> I think these directories belong to task tracker temporary storage. I
>>>>> am not very confident to conclude that go ahead with your clean up. So,
>>>>> wait for similar or an expert's response
>>>>>
>>>>> Sent from HTC via Rocket! excuse typo.
>>>>>
>>>>>  ------------------------------
>>>>> * From: * Chunky Gupta <[EMAIL PROTECTED]>;
>>>>> * To: * <[EMAIL PROTECTED]>;
>>>>> * Subject: * dfs storage full on all slave machines of 6 machine hive
>>>>> cluster
>>>>> * Sent: * Mon, Mar 18, 2013 10:37:39 AM
>>>>>
>>>>>   Hi,
>>>>>
>>>>> We have a 6 machine hive cluster. We are getting errors while a query
>>>>> is running and it fails. I found that on all 5 slaves storage is nearly
>>>>> full ( 96%, 98%, 100%, 97%, 98% storage used) .
>>>>>
>>>>> On my slaves machines, this folder "/mnt/hadoop-fs/dfs/data/current/"
>>>>> is contributing 95% storage used. It contains folders with names "subdir0",
>>>>> "subdir1", etc and under them there are many files with name like
>>>>> "blk_-4071357924681234567" and blk_-4071357924681234567_246813.meta:, etc.
>>>>>
>>>>> I want to delete these subdir folders but I am not sure if it will not
>>>>> affects the tables which I have created.
>>>>>
>>>>> Can anyone help me and tell me what are these folders used for ?.
>>>>>
>>>>> Thanks,
>>>>> Chunky.
>>>>>
>>>>
>>>>
>>>
>>
>>
>> --
>> Alok Kumar
>>
>
>
--
Alok Kumar
+
Chunky Gupta 2013-03-18, 10:37