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Yang, Tong
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Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com> Co-authored-by: Yang, Tong <yangtong2@huawei.com> Co-committed-by: Yang, Tong <yangtong2@huawei.com>
76 lines
7.4 KiB
HTML
76 lines
7.4 KiB
HTML
<a name="alm_14008"></a><a name="alm_14008"></a>
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<h1 class="topictitle1">ALM-14008 HDFS DataNode Memory Usage Exceeds the Threshold</h1>
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<div id="body8662426"><div class="section" id="alm_14008__en-us_topic_0191813907_section27139175"><h4 class="sectiontitle">Description</h4><p id="alm_14008__en-us_topic_0191813907_p16670523">The system checks the HDFS DataNode memory usage every 30 seconds and compares the actual memory usage with the threshold. The HDFS DataNode memory usage has a default threshold. This alarm is generated when the HDFS DataNode memory usage exceeds the threshold.</p>
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<p id="alm_14008__en-us_topic_0191813907_p8135151">This alarm is cleared when the HDFS DataNode memory usage is less than or equal to the threshold.</p>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section42925989"><h4 class="sectiontitle">Attribute</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="alm_14008__en-us_topic_0191813907_table54967495" frame="border" border="1" rules="all"><thead align="left"><tr id="alm_14008__en-us_topic_0191813907_row29231803"><th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.1.4.1.1"><p id="alm_14008__en-us_topic_0191813907_p18965813">Alarm ID</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.1.4.1.2"><p id="alm_14008__en-us_topic_0191813907_p59835867">Alarm Severity</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.1.4.1.3"><p id="alm_14008__en-us_topic_0191813907_p14867095">Auto Clear</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="alm_14008__en-us_topic_0191813907_row63384014"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.1.4.1.1 "><p id="alm_14008__en-us_topic_0191813907_p33831530">14007</p>
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</td>
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.1.4.1.2 "><p id="alm_14008__en-us_topic_0191813907_p55999443">Major</p>
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</td>
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<td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.1.4.1.3 "><p id="alm_14008__en-us_topic_0191813907_p39661040">Yes</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section50789581"><h4 class="sectiontitle">Parameters</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="alm_14008__en-us_topic_0191813907_table58427690" frame="border" border="1" rules="all"><thead align="left"><tr id="alm_14008__en-us_topic_0191813907_row29990828"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.3.2.1.3.1.1"><p id="alm_14008__en-us_topic_0191813907_p13338021">Parameter</p>
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</th>
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<th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.3.2.1.3.1.2"><p id="alm_14008__en-us_topic_0191813907_p6637886">Description</p>
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</th>
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</tr>
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</thead>
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<tbody><tr id="alm_14008__en-us_topic_0191813907_row797855"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14008__en-us_topic_0191813907_p64626289">ServiceName</p>
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</td>
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<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.2 "><p id="alm_14008__en-us_topic_0191813907_p238043">Specifies the service for which the alarm is generated.</p>
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</td>
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</tr>
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<tr id="alm_14008__en-us_topic_0191813907_row2142393"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14008__en-us_topic_0191813907_p39316155">RoleName</p>
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</td>
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<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.2 "><p id="alm_14008__en-us_topic_0191813907_p30492010">Specifies the role for which the alarm is generated.</p>
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</td>
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<tr id="alm_14008__en-us_topic_0191813907_row5992637"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14008__en-us_topic_0191813907_p15641626">HostName</p>
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</td>
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<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.2 "><p id="alm_14008__en-us_topic_0191813907_p59012183">Specifies the host for which the alarm is generated.</p>
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</td>
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</tr>
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<tr id="alm_14008__en-us_topic_0191813907_row61347601"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14008__en-us_topic_0191813907_p3099778">Trigger condition</p>
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</td>
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<td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.2 "><p id="alm_14008__en-us_topic_0191813907_p49755431">Generates an alarm when the actual indicator value exceeds the specified threshold.</p>
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</td>
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</tr>
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</tbody>
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</table>
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</div>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section54453050"><h4 class="sectiontitle">Impact on the System</h4><p id="alm_14008__en-us_topic_0191813907_p3658088">The HDFS DataNode memory usage is too high, which affects the data read/write performance of the HDFS.</p>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section20315403"><h4 class="sectiontitle">Possible Causes</h4><p id="alm_14008__en-us_topic_0191813907_p27869743">The HDFS DataNode memory is insufficient.</p>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section48620907"><h4 class="sectiontitle">Procedure</h4><ol id="alm_14008__en-us_topic_0191813907_ol4460257155549"><li class="tableheading" id="alm_14008__en-us_topic_0191813907_li34335362155549"><span>Delete unnecessary files.</span><p><ol type="a" id="alm_14008__en-us_topic_0191813907_ol50165743"><li id="alm_14008__en-us_topic_0191813907_li35572112">Use the client on the cluster node and run the <strong id="alm_14008__b1370685115117">hdfs dfs -rm -r</strong> <em id="alm_14008__i117111511414">file or directory path</em> command to delete unnecessary files. </li><li id="alm_14008__en-us_topic_0191813907_li28048521">Wait 5 minutes and check whether the alarm is cleared.<ul class="subitemlist" id="alm_14008__en-us_topic_0191813907_ul51110099"><li id="alm_14008__en-us_topic_0191813907_li57337714">If yes, no further action is required.</li><li id="alm_14008__en-us_topic_0191813907_li46277382">If no, go to <a href="#alm_14008__en-us_topic_0191813907_li572522141314">2</a>.</li></ul>
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</li></ol>
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</p></li><li id="alm_14008__en-us_topic_0191813907_li572522141314"><a name="alm_14008__en-us_topic_0191813907_li572522141314"></a><a name="en-us_topic_0191813907_li572522141314"></a><span>Collect fault information.</span><p><ol type="a" id="alm_14008__en-us_topic_0191813907_en-us_topic_0191813935_ol6089206913036"><li id="alm_14008__en-us_topic_0191813907_en-us_topic_0191813935_li4478836213036">On MRS Manager, choose <span class="menucascade" id="alm_14008__menucascade11627555212"><b><span class="uicontrol" id="alm_14008__uicontrol116271554219">System</span></b> > <b><span class="uicontrol" id="alm_14008__uicontrol362735124">Export Log</span></b></span>.</li><li id="alm_14008__li18574327401">Contact technical support engineers for help. For details, see <a href="https://docs.otc.t-systems.com/en-us/public/learnmore.html" target="_blank" rel="noopener noreferrer">technical support</a>.</li></ol>
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</p></li></ol>
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</div>
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<div class="section" id="alm_14008__en-us_topic_0191813907_section34934986"><h4 class="sectiontitle">Reference</h4><p id="alm_14008__en-us_topic_0191813907_p62880759">None</p>
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</div>
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</div>
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<div>
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<div class="familylinks">
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<div class="parentlink"><strong>Parent topic:</strong> <a href="mrs_01_0241.html">Alarm Reference (Applicable to Versions Earlier Than MRS 3.x)</a></div>
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</div>
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</div>
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