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List: hadoop-user
Subject: Re: Detailing on how UPDATE is performed in Hive
From: "Yakubovich, Alexey" <Alexey.Yakubovich () searshc ! com>
Date: 2014-11-27 16:56:39
Message-ID: D09CB3D5.2CE2%alexey.yakubovich () searshc ! com
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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
This message, including any attachments, is the property of Sears Holdings \
Corporation and/or one of its subsidiaries. It is confidential and may contain \
proprietary or legally privileged information. If you are not the intended recipient, \
please delete it without reading the contents. Thank you.
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<body style="word-wrap: break-word; -webkit-nbsp-mode: space; -webkit-line-break: \
after-white-space; color: rgb(0, 0, 0); font-size: 14px; font-family: Calibri, \
sans-serif;"> <div>Thanks, Nalinj.</div>
<div><br>
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<span id="OLK_SRC_BODY_SECTION">
<div style="font-family:Calibri; font-size:11pt; text-align:left; color:black; \
BORDER-BOTTOM: medium none; BORDER-LEFT: medium none; PADDING-BOTTOM: 0in; \
PADDING-LEFT: 0in; PADDING-RIGHT: 0in; BORDER-TOP: #b5c4df 1pt solid; BORDER-RIGHT: \
medium none; PADDING-TOP: 3pt"> <span style="font-weight:bold">From: </span>Nitin \
Pawar <<a href="mailto:nitinpawar432@gmail.com">nitinpawar432@gmail.com</a>><br>
<span style="font-weight:bold">Reply-To: </span>"<a \
href="mailto:user@hadoop.apache.org">user@hadoop.apache.org</a>" <<a \
href="mailto:user@hadoop.apache.org">user@hadoop.apache.org</a>><br> <span \
style="font-weight:bold">Date: </span>Thursday, November 27, 2014 at 6:05 AM<br> \
<span style="font-weight:bold">To: </span>"<a \
href="mailto:user@hadoop.apache.org">user@hadoop.apache.org</a>" <<a \
href="mailto:user@hadoop.apache.org">user@hadoop.apache.org</a>><br> <span \
style="font-weight:bold">Cc: </span>User - Hive <<a \
href="mailto:user@hive.apache.org">user@hive.apache.org</a>><br> <span \
style="font-weight:bold">Subject: </span>Re: Detailing on how UPDATE is performed in \
Hive<br> </div>
<div><br>
</div>
<div>
<div>
<div dir="ltr"><a href="https://cwiki.apache.org/confluence/display/Hive/Hive+Tran \
sactions">https://cwiki.apache.org/confluence/display/Hive/Hive+Transactions</a><br>
<div><br>
</div>
<div>entire implementation is under jira here <a \
href="https://issues.apache.org/jira/browse/HIVE-5317">https://issues.apache.org/jira/browse/HIVE-5317</a></div>
</div>
<div class="gmail_extra"><br>
<div class="gmail_quote">On Thu, Nov 27, 2014 at 4:11 PM, unmesha sreeveni <span \
dir="ltr"> <<a href="mailto:unmeshabiju@gmail.com" \
target="_blank">unmeshabiju@gmail.com</a>></span> wrote:<br> <blockquote \
class="gmail_quote" style="margin:0 0 0 .8ex;border-left:1px #ccc \
solid;padding-left:1ex"> <div dir="ltr">
<div class="gmail_default" style="font-family:verdana,sans-serif">Hi friends</div>
<div class="gmail_default" style="font-family:verdana,sans-serif"> Where can I \
find details on how update is performed in Hive.</div> <div class="gmail_default" \
style="font-family:verdana,sans-serif"><br> </div>
<div>
<div class="gmail_default" style="font-family:verdana,sans-serif">1. When an \
update is performed,whether HDFS will write that block elsewhere with the new \
value. </div> <div class="gmail_default" \
style="font-family:verdana,sans-serif">2. whether the old block is unallocated and is \
allowed for further writes. </div> <div class="gmail_default" \
style="font-family:verdana,sans-serif">3. Whether this process create fragmentation \
?</div> <div class="gmail_default" style="font-family:verdana,sans-serif">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?</div> <div class="gmail_default" style="font-family:verdana,sans-serif"><br>
</div>
<div class="gmail_default" style="font-family:verdana,sans-serif">where will be the \
good place to gather these knowlege</div> <span class="HOEnZb"><font \
color="#888888"><br> </font></span></div>
<span class="HOEnZb"><font color="#888888">-- <br>
<div>
<div dir="ltr">
<div>
<div dir="ltr"><b><font color="#3d85c6"><i>Thanks & Regards</i> </font></b>
<div><i><b><font color="#3d85c6"><br>
</font></b></i></div>
<div><b><font color="#3d85c6">Unmesha Sreeveni U.B<i><br>
</i></font></b></div>
<div><b><font color="#3d85c6">Hadoop, Bigdata Developer</font></b></div>
<div><b><font color="#3d85c6">Centre for Cyber Security | Amrita Vishwa \
Vidyapeetham</font></b><br> </div>
<div style="color:rgb(102,0,0)"><a href="http://www.unmeshasreeveni.blogspot.in/" \
target="_blank">http://www.unmeshasreeveni.blogspot.in/</a><br> </div>
<div style="color:rgb(102,0,0)"><br>
</div>
<i><span><br>
</span></i></div>
</div>
</div>
</div>
</font></span></div>
</blockquote>
</div>
<br>
<br clear="all">
<div><br>
</div>
-- <br>
<div class="gmail_signature">Nitin Pawar<br>
</div>
</div>
</div>
</div>
</span>
<DIV>
This message, including any attachments, is the property of Sears Holdings \
Corporation and/or one of its subsidiaries. It is confidential and may contain \
proprietary or legally privileged information. If you are not the intended recipient, \
please delete it without reading the contents. Thank you.<BR> </DIV></body>
</html>
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