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Date: Thu, 14 Mar 2013 04:29:17 -0700 (PDT)
From: Manish Bhoge <manishbhoge@rocketmail.com>
Subject: Re: Block vs FileSplit vs record vs line
To: "user@hadoop.apache.org" <user@hadoop.apache.org>,
  "saigraph@yahoo.in" <saigraph@yahoo.in>
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Sai,
Each file is divided into split as per the map input format, each split is equal to a map. You rightly stated 1 split=1 block=1 map. Record can be combination of block defined by recordreader code. One record can be series of maps or splits or blocks. 

Hope this will clear. 

Sent from HTC via Rocket! excuse typo.


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<table cellspacing="0" cellpadding="0" border="0"><tr><td valign="top" style="font: inherit;"><p>Sai,<br>
Each file is divided into split as per the map input format, each split is equal to a map. You rightly stated 1 split=1 block=1 map. Record can be combination of block defined by recordreader code. One record can be series of maps or splits or blocks. </p>
<p>Hope this will clear. </p>
<p>Sent from HTC via Rocket! excuse typo.</p>
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                            <b>
                                <span style="font-weight:bold;">From:</span>
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                            Sai Sai &lt;saigraph@yahoo.in&gt;;                            <br>
                            <b>
                                <span style="font-weight:bold:">To:</span>
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                            user@hadoop.apache.org &lt;user@hadoop.apache.org&gt;;                                                                                                     <br>
                            <b>
                                <span style="font-weight:bold:">Subject:</span>
                            </b>
                            Re: Block vs FileSplit vs record vs line                            <br>
                            <b>
                                <span style="font-weight:bold;">Sent:</span>
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                            Thu, Mar 14, 2013 8:45:53 AM                            <br>
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                                        <td valign="top" style="font:inherit;"><div style="color:#000;background-color:#fff;font-family:times new roman, new york, times, serif;font-size:12pt;">Just wondering if this is right way to understand this:<br>A large file is split into multiple blocks and each block is split into multiple file splits and each file split has multiple records and each record has multiple lines. Each line is processed by 1 instance of mapper.<br>Any help is appreciated.<br>Thanks<br>Sai<br><div><span><br></span></div><br> <div style="font-family:times new roman, new york, times, serif;font-size:12pt;"><br> </div>  </div></td>
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