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Lu, Huayi 95132e24fc DWS UMN 830.201_new version 
Reviewed-by: Pruthi, Vineet <vineet.pruthi@t-systems.com>
Reviewed-by: Rechenburg, Matthias <matthias.rechenburg@t-systems.com>
Co-authored-by: Lu, Huayi <luhuayi@huawei.com>
Co-committed-by: Lu, Huayi <luhuayi@huawei.com>
2024-05-27 11:54:34 +00:00

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<a name="EN-US_TOPIC_0000001707254733"></a><a name="EN-US_TOPIC_0000001707254733"></a>
<h1 class="topictitle1">Creating an MRS Data Source Connection</h1>
<div id="body8662426"><div class="section" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_section31806539111657"><h4 class="sectiontitle">Scenario</h4><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p2888082611171">Before GaussDB(DWS) reads data from MRS HDFS, you need to create an MRS data source connection that functions as a channel of transporting data warehouse cluster data and MRS cluster data.</p>
</div>
<div class="section" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_section6669021616559"><h4 class="sectiontitle">Impact on the System</h4><ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul19122053162626"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li54217529162626">You can create only one MRS data source connection in the data warehouse cluster at a time.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li1614044617304">When an MRS data source connection is being created, the system automatically adds inbound and outbound rules to security groups of the data warehouse cluster and MRS cluster. Nodes in the same subnet can be accessed.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li50139684174447">For the MRS cluster with Kerberos authentication enabled, the system automatically adds a <span class="parmvalue" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmvalue55512574410539"><b>Machine-Machine</b></span> user that belongs to user group <span class="parmvalue" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmvalue1643205523105327"><b>supergroup</b></span> to the MRS cluster.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_section45940751111911"><h4 class="sectiontitle">Prerequisites</h4><ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul134391253162311"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li184105715246">You have created a data warehouse cluster and recorded the VPC and subnet where the cluster resides.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li434035834211">An MRS cluster of the analysis type has been created.</li></ul>
</div>
<div class="section" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_section4276196111818"><h4 class="sectiontitle">Procedure</h4><ol id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ol39469418111823"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li1271831292013"><span>Log in to the public cloud management console.</span></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li1535616272352"><span>Choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b201306611318">Service List</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b766811336316"><span id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_text172637512251">EI Enterprise Intelligence</span></strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1513015614316">MapReduce Service</strong> to enter the MRS management console and create a cluster.</span><p><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p4315767811387">Configure parameters as required. For details, see "Cluster Operation Guide &gt; Custom Creation of a Cluster" in the <i><cite id="EN-US_TOPIC_0000001707254733__cite6361046eaa7040b48d05905b562bdb12164851">MapReduce Service User Guide</cite></i>.</p>
<ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul3441083216816"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li5272808816816">The VPC of the MRS cluster must be the same as that of the data warehouse cluster.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li2437491016829">MRS cluster versions 1.9.2, 2.1.0, 3.0.2-LTS, and 3.1.2-LTS are recommended.<div class="note" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_note2080911423396"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul124012311169"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li15240423151617">For clusters of version 8.1.1.300 and later, MRS clusters support versions 1.6.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i138249581818">*</em>, 1.7.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i665414114218">*</em>, 1.8.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i149281238214">*</em>, 1.9.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i69905518219">*</em>, 2.0.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i179768710214">*</em>, 3.0.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i1835851016214">*</em>, 3.1.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i16669855143614">*</em>, and later (<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i8902135513111">*</em> indicates a number).</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li13241202310160">For clusters earlier than version 8.1.1.300, MRS clusters support versions 1.6.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i1928441218220">*</em>, 1.7.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i15285151214211">*</em>, 1.8.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i9286171211210">*</em>, 1.9.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i16286412927">*</em>, and 2.0.<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i1028713121229">*</em> (<em id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_i10288212323">*</em> indicates a number).</li></ul>
</div></div>
</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li10138907125133">Select the Hadoop component.</li></ul>
<p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p476754914578">If you already have a qualified MRS cluster, skip this step.</p>
</p></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li1893111262416"><span>Choose <strong id="EN-US_TOPIC_0000001707254733__b87502048152316">Service List</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__b1375064811231"><span id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_text460710296236">EI Enterprise Intelligence</span></strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__b2751194818236">GaussDB(DWS)</strong>.</span></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li10022705112330"><span>On the GaussDB(DWS) management console, choose <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__uicontrol127967587231"><b>Clusters &gt; Dedicated Clusters</b></span>.</span></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li60457944112332"><span id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p519411236117">In the cluster list, click the name of a cluster. The <span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname86531826102616"><b>Cluster Information</b></span> page is displayed.</span></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li164024261116"><span>In the navigation tree on the left, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b84431615308">Data Sources</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1376321817305">MRS Data Sources</strong>.</span></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li3340418312015"><span>Click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol6943527499153"><b>Create MRS Cluster Connection</b></span> and configure parameters.</span><p>
<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table23910031142621" frame="border" border="1" rules="all"><caption><b>Table 1 </b>MRS common connection parameters</caption><thead align="left"><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row53231825142621"><th align="left" class="cellrowborder" valign="top" width="20.57%" id="mcps1.3.4.2.7.2.1.2.3.1.1"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p17077205142621"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b84235270692541">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="79.43%" id="mcps1.3.4.2.7.2.1.2.3.1.2"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p41076347142621"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b842352706191716">Description</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row14144102921615"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.1.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p151457299163">Data Source</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.1.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p555618304262">GaussDB(DWS) database server name. It can contain 3 to 63 characters, including lowercase letters, numbers, and underscores (_), and must start with a lowercase letter.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row1330665411718"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.1.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p13306154101714">Configuration Mode</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.1.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p101021856152110">The way in which the system obtains files. The options are as follows:</p>
<ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul9153172718287"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li0153122718283"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b115741476476">MRS Account</strong>: Configure the username and password of the Manager of the MRS cluster. The system will log in to the Manager and automatically download configuration and verification files. For more information, see <a href="#EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table146145019347">Table 2</a>.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li5153162715289"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b530319202473">File upload</strong>: Download the configuration file from the Manager of the MRS cluster and manually upload it. You can use this method for Kerberos authentication. For more information, see <a href="#EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table64029343414">Table 3</a>.<div class="note" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_note639413421414"><span class="notetitle"> NOTE: </span><div class="notebody"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p639412421943">If you select <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1226019452481">File upload</strong>, ensure that MRS can communicate with the GaussDB(DWS) cluster.</p>
</div></div>
</li></ul>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row17726639398"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.1.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p27261434398">Database</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.1.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p172712314395">Database where the data source is located.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row895856614324"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.1.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p5455528514324">Description</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.1.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p5690199714324">Description of the connection.</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table146145019347"></a><a name="en-us_topic_0000001423159621_table146145019347"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table146145019347" frame="border" border="1" rules="all"><caption><b>Table 2 </b>Parameters of the MRS Account mode</caption><thead align="left"><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row1277713109617"><th align="left" class="cellrowborder" valign="top" width="20.57%" id="mcps1.3.4.2.7.2.2.2.3.1.1"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p321165031116"><strong id="EN-US_TOPIC_0000001707254733__b924954781">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="79.43%" id="mcps1.3.4.2.7.2.2.2.3.1.2"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p17217508113"><strong id="EN-US_TOPIC_0000001707254733__b60283896">Description</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row26145013414"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p76141906342">MRS Data Source</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p1761400153417">Select an MRS cluster that can be connected to GaussDB(DWS) from the drop-down list box. By default, the custom, hybrid, and analytical MRS clusters that are in the same VPC and subnet as the current GaussDB(DWS) cluster and available to the current user are displayed.</p>
<p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p1261440193414">After you select an MRS cluster, the system automatically displays whether Kerberos authentication is enabled for the selected cluster. Click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol1437414014314"><b>View MRS Cluster</b></span> to view its detailed information.</p>
<p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p26141406347">If the <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b523125611613">MRS Data Source</strong> drop-down list is empty, click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol230942777211312"><b>Create MRS Cluster</b></span> to create an MRS cluster.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row206141023415"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p1614100153415">MRS Account</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p12614130123412">Account used when a GaussDB(DWS) cluster connects to an MRS cluster.</p>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row1614901345"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p161410143416">Password</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p461420018341">Password of the connection user. If you change the password, you need to create a connection again.</p>
<div class="notice" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_note1861515003413"><span class="noticetitle"> NOTICE: </span><div class="noticebody"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p186155016342">Ensure the account has been used for logging in to MRS Manager. If you use a new account, you will be asked to change your password when you first log in. In this case, the MRS data source will fail to be configured.</p>
</div></div>
</td>
</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row18304629153414"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.2.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p430452919343">Use a Machine-Machine Account</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.2.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p930422911343">Creates a machine-machine account named dws in MRS and uses it for interaction with MRS. This account is in the <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1585821252914">supergroup</strong> group and has all permissions. If the switch is toggled off, the configured man-machine account will be used. Ensure this account has the permission to access data, or a message will be displayed during data source access, indicating the required file does not exist.</p>
</td>
</tr>
</tbody>
</table>
</div>
<div class="tablenoborder"><a name="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table64029343414"></a><a name="en-us_topic_0000001423159621_table64029343414"></a><table cellpadding="4" cellspacing="0" summary="" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_table64029343414" frame="border" border="1" rules="all"><caption><b>Table 3 </b>Parameters of the File upload mode</caption><thead align="left"><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row5181341114"><th align="left" class="cellrowborder" valign="top" width="20.57%" id="mcps1.3.4.2.7.2.3.2.3.1.1"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p37448416291"><strong id="EN-US_TOPIC_0000001707254733__b68886109">Parameter</strong></p>
</th>
<th align="left" class="cellrowborder" valign="top" width="79.43%" id="mcps1.3.4.2.7.2.3.2.3.1.2"><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p374410472918"><strong id="EN-US_TOPIC_0000001707254733__b1779410493">Description</strong></p>
</th>
</tr>
</thead>
<tbody><tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row0402153414411"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.3.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p340263484118">Authentication Credential</p>
</td>
<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.3.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p8676724134310">Keytab file of a user A credential file downloaded from Manager of the MRS cluster. File name format: <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b4469115113815">Username_Timestamp_keytab.tar</strong></p>
<ul id="EN-US_TOPIC_0000001707254733__ul18870185816469"><li id="EN-US_TOPIC_0000001707254733__li8870145814611"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b65041655133817">For MRS 2.x or earlier</strong>, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b131111213144018">System</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b13349194412312">Manage User</strong>. In the <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b19714153632419">Operation</strong> column of a user, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1911535302316">More</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b19762155716231">Download authentication credential</strong>.</li><li id="EN-US_TOPIC_0000001707254733__li687015589461"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b157201549243">For MRS 3.x or later</strong>, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b7265316102416">System</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b189789175245">Permission</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b19487132119249">User</strong>. In the <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b3349114718243">Operation</strong> column of a user, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b8962175110246">More</strong> &gt; <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b13759530247">Download Authentication Credential</strong>.</li></ul>
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</tr>
<tr id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_row10402334174115"><td class="cellrowborder" valign="top" width="20.57%" headers="mcps1.3.4.2.7.2.3.2.3.1.1 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p6341730135112">Client Profile</p>
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<td class="cellrowborder" valign="top" width="79.43%" headers="mcps1.3.4.2.7.2.3.2.3.1.2 "><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p140253434119">Client configuration files of HDFS, Hive, and hosts. When downloading the client, set <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b923212308273">Select Client Type</strong> to <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1898312602712">Configuration Files Only</strong>.</p>
<ul id="EN-US_TOPIC_0000001707254733__ul681491517477"><li id="EN-US_TOPIC_0000001707254733__li181418151478"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b11247143413259">For MRS 2.x or earlier</strong>, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b1070373562513">Services</strong> and click <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b395240132519">Download Client</strong>.<p id="EN-US_TOPIC_0000001707254733__p6464201834716"></p>
</li><li id="EN-US_TOPIC_0000001707254733__li2814315164716"><strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b310244420252">For MRS 3.x or later</strong>, choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b67100530255">Homepage</strong>. Click the <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b412010220263">More</strong> icon and choose <strong id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_b21061883267">Download Client</strong>.<p id="EN-US_TOPIC_0000001707254733__p1531982012472"></p>
</li></ul>
</td>
</tr>
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</p></li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li364440831845"><span>Click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol224465534142516"><b>OK</b></span> to save the connection.</span><p><p id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_p63882731848"><span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname1945153642142645"><b>Configuration Status</b></span> turns to <span class="parmvalue" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmvalue1141182238142645"><b>Creating</b></span>. You can view the connection that is successfully created in the MRS data source list and the connection status is <span class="parmvalue" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmvalue555125744142917"><b>Available</b></span>.</p>
<div class="note" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_note40596202142352"><img src="public_sys-resources/note_3.0-en-us.png"><span class="notetitle"> </span><div class="notebody"><ul id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_ul472732691860"><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li324344061860">In the <span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname884453594143010"><b>Operation</b></span> column, you can click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol427244187143132"><b>Update Configurations</b></span> to update <span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname27485509014328"><b>MRS Cluster Status</b></span> and <span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname769647905143247"><b>Configuration Status</b></span>. During configuration update, you cannot create a connection. The system checks whether the security group rule is correct. If the rule is incorrect, the system rectifies the fault. For details, see <a href="dws_01_0156.html">Updating the MRS Data Source Configuration</a>.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li3824111019238">In the <span class="parmname" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_parmname1364560745143326"><b>Operation</b></span> column, you can click <span class="uicontrol" id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_uicontrol149965689143326"><b>Delete</b></span> to delete the unnecessary connection. When deleting a connection, you need to manually delete the security group rule.</li><li id="EN-US_TOPIC_0000001707254733__en-us_topic_0000001423159621_li670407441860">If the security group rules are not deleted, nodes in the data warehouse cluster can still communicate with nodes in the MRS cluster. If you have strict requirements on network security, manually delete the rules.</li></ul>
</div></div>
</p></li></ol>
</div>
</div>
<div>
<div class="familylinks">
<div class="parentlink"><strong>Parent topic:</strong> <a href="dws_01_0057.html">MRS Data Sources</a></div>
</div>
</div>
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