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From "Yakubovich, Alexey" <Alexey.Yakubov...@searshc.com>
Subject Re: Detailing on how UPDATE is performed in Hive
Date Thu, 27 Nov 2014 16:56:39 GMT
Thanks, Nalinj.

From: Nitin Pawar <nitinpawar432@gmail.com<mailto:nitinpawar432@gmail.com>>
Reply-To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Date: Thursday, November 27, 2014 at 6:05 AM
To: "user@hadoop.apache.org<mailto:user@hadoop.apache.org>" <user@hadoop.apache.org<mailto:user@hadoop.apache.org>>
Cc: User - Hive <user@hive.apache.org<mailto:user@hive.apache.org>>
Subject: Re: Detailing on how UPDATE is performed in Hive

https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions

entire implementation is under jira here https://issues.apache.org/jira/browse/HIVE-5317

On Thu, Nov 27, 2014 at 4:11 PM, unmesha sreeveni <unmeshabiju@gmail.com<mailto:unmeshabiju@gmail.com>>
wrote:
Hi friends
  Where can I find details on how update is performed in Hive.

​1. When an update is performed,whether HDFS will write that block elsewhere with the new
value.
2. whether the old block is unallocated and is allowed for further writes.
3. Whether this process create fragmentation ?
4. while creating a partitioned table, and update is performed ,whether the partition is deleted
and updated with new value or the entire block is deleted and written once again?

where will be the good place to gather these knowlege​

--
Thanks & Regards

Unmesha Sreeveni U.B
Hadoop, Bigdata Developer
Centre for Cyber Security | Amrita Vishwa Vidyapeetham
http://www.unmeshasreeveni.blogspot.in/





--
Nitin Pawar

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