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586 lines
37 KiB
586 lines
37 KiB
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<title>Laboratory Report - Cloud Computing & Services</title>
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<body class="article">
|
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<div id="header">
|
|
<h1>Laboratory Report - Cloud Computing & Services</h1>
|
|
</div>
|
|
<div id="content">
|
|
<div id="preamble">
|
|
<div class="sectionbody">
|
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<div class="paragraph">
|
|
<p><strong><em>Authors</em></strong></p>
|
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</div>
|
|
<table class="tableblock frame-all grid-all stretch">
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<colgroup>
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<col style="width: 50%;">
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<col style="width: 50%;">
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</colgroup>
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<tbody>
|
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<tr>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock">Oulis Evangelos</p></td>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock"><<a href="mailto:cs151051@uniwa.gr">cs151051@uniwa.gr</a>></p></td>
|
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</tr>
|
|
<tr>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock">Drosos Katsimpras</p></td>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock"><<a href="mailto:cs131110@uniwa.gr">cs131110@uniwa.gr</a>></p></td>
|
|
</tr>
|
|
<tr>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock">Oulis Nikolaos</p></td>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock"><<a href="mailto:cs161079@uniwa.gr">cs161079@uniwa.gr</a>></p></td>
|
|
</tr>
|
|
<tr>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock">Kampoli Agathi</p></td>
|
|
<td class="tableblock halign-left valign-top"><p class="tableblock"><<a href="mailto:cs131031@uniwa.gr">cs131031@uniwa.gr</a>></p></td>
|
|
</tr>
|
|
</tbody>
|
|
</table>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_hadoop">Hadoop</h2>
|
|
<div class="sectionbody">
|
|
<div class="paragraph">
|
|
<p>Το Hadoop αποτελεί μία συλλογή από open-source βοηθητικά προγράμματα το αποία προσφέρουν
|
|
τα απαραίτητα εφόδια για την επίλυση προβλημάτων (υπολογιστικών προβλημάτων) τα οποία
|
|
διαθέτουν μεγάλο όγκο δεδομένων και υπολογισμών σε ένα πλέγμα υπολογιστών. Η κατάτμηση
|
|
των δεδομένων και η συνεργασία πολλών υπολογιστικών συστημάτων κάνει αυτό το framework
|
|
πολύ αποδοτικό ειδικά σε προβλήματα όπου τα δεδομένα είναι σε αυξημένη κλίμακα και οι
|
|
υπολογσιστικές πράξεις για μία ορισμένη επεξεργασία πολύπλοκες.</p>
|
|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_utilities">Utilities</h3>
|
|
<div class="paragraph">
|
|
<p>Το framework αποτελείται από ένα προγραμματισμένο μοντέλο <strong>Map Reduce</strong> το οποίο αποτελείται
|
|
από ένα κατανεμημένο σύστημα αποθήκευσης (storage) για την επεξεργασία δεδομένων μεγάλης κλίμακας
|
|
(Big Data Processing).</p>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_why">Why?</h2>
|
|
<div class="sectionbody">
|
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<div class="paragraph">
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<p>Το hadoop έχει αναπτυχθεί για μεγάλα υπολογιστικά συστήματα (clusters) τα οποία αποτελούνται
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από 2, 3 ακόμα και εκατοντάδες υπολογιστικές μηχανές. Το υλικό αυτών των μηχανών (commodity
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hardware) να αποτελείται από υλικό εξειδικευμένο για παράλληλο υπολογισμό το αποίο από τη φύση
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του είναι φτηνό. Ακόμα, έχει αναπτυχθεί και χρησιμοποιείται και σε πλέγματα υπολογιστών
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όπου τα μηχανήματα διαθέτουν πιο αποδοτικό hardware.</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_how">How?</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>Όλα τα κομμάτια του hadoop έχουν αναπτυχθεί με σκοπό την διαχείριση των σφαλμάτων του Hardware με
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μηχανισμούς που ορίζει το Framework.</p>
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</div>
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</div>
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</div>
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<div class="sect1">
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<h2 id="_hadoop_description">Hadoop Description</h2>
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<div class="sectionbody">
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<div class="paragraph">
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<p>Ο πυρήνας του hadoop αποτελείται από ένα μέρος που αφορά την αποθήκη των δεδομένων. Είναι γνωστή ως
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<strong>Hadoop Distributed File System (HDFS)</strong>, και το μέρος την υπολογιστικής επεηεργασίας δεδομένων που είναι
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γνωστό ως <strong>MapReduce programming Model</strong>.</p>
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</div>
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<div class="sect2">
|
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<h3 id="_hadoop_destributed_file_system_hdfs">Hadoop Destributed File System (HDFS)</h3>
|
|
<div class="paragraph">
|
|
<p>Το Hadoop Desctributed File System αποτελείται από έναν κατανεμημένο χώρο αποθήκευσης ο οποίος
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|
μοιράζεται από τις υπολογιστικές μηχανές ενός πλέγματος όπου το Hadoop διαχειρίζεται. Η κύρια
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|
λειτουργία του είναι η κατάτμηση των αρχείων σε μεγάλα τμήματα (blocks) και η κατανομή αυτών
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|
σε όλες τις μηχανές του πλέγματος (cluster).</p>
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</div>
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<div class="paragraph">
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|
<p>Έπειτα αναλαμβάνει την διαμοίραση ενός τμήματος του
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|
κώδικα ο οποίος είναι χρήσιμος για κάθε μηχανή, όπου τους δίνει τη δυνατότητα εφαρμογής ενός
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|
συνόλου εντολών για την παράλληλη επεξεργασία των δεδομένων αντίστοιχα σε κάθε μηχανή. Αυτό δίνει
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|
τη δυνατότητα στην κάθε μηχανή του πλέγματος να διαχειρίζεται το δικό της μέρος των δεδομένων σαν
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|
να είναι στο τοπικό της σύστημα.</p>
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</div>
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|
<div class="paragraph">
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|
<p>Αυτό επιτυγχάνει μεγάλες ταχύτητες στην επεξεργασία δεδομένων μεγάλης κλίμακας, και ακόμα ταχύτερη μπορεί
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|
να γίνει όταν το δίκτυο το οποίο διέπει αυτό το πλέγμα προσφέρει μεγάλες ταχύτητες επικοινωνίες μεταξύ
|
|
των υπολογιστικών μηχανών.</p>
|
|
</div>
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|
</div>
|
|
<div class="sect2">
|
|
<h3 id="_hadoop_modules">Hadoop Modules</h3>
|
|
<div class="ulist">
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|
<ul>
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|
<li>
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|
<p>Hadoop Common – contains libraries and utilities needed by other Hadoop modules,</p>
|
|
</li>
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|
<li>
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|
<p>Hadoop Distributed File System (HDFS) – a distributed file-system that stores data on commodity machines, providing very high aggregate bandwidth across the cluster,</p>
|
|
</li>
|
|
<li>
|
|
<p>Hadoop YARN – (introduced in 2012) a platform responsible for managing computing resources in clusters and using them for scheduling users' applications,</p>
|
|
</li>
|
|
<li>
|
|
<p>Hadoop MapReduce – an implementation of the MapReduce programming model for large-scale data processing.</p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
</div>
|
|
<div class="sect1">
|
|
<h2 id="_references">References</h2>
|
|
<div class="sectionbody">
|
|
<div class="ulist">
|
|
<ul>
|
|
<li>
|
|
<p>[1] <a href="https://en.wikipedia.org/wiki/Apache_Hadoop">Hadoop General Description</a></p>
|
|
</li>
|
|
</ul>
|
|
</div>
|
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</div>
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</div>
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</div>
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<div id="footer">
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<div id="footer-text">
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Last updated 2020-06-11 17:06:36 +0300
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