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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_14007"></a><a name="alm_14007"></a>
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<h1 class="topictitle1">ALM-14007 HDFS NameNode Memory Usage Exceeds the Threshold</h1>
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<div id="body8662426"><div class="section" id="alm_14007__en-us_topic_0191813906_section439002"><h4 class="sectiontitle">Description</h4><p id="alm_14007__en-us_topic_0191813906_p53582808">The system checks the HDFS NameNode memory usage every 30 seconds and compares the actual memory usage with the threshold. The HDFS NameNode memory usage has a default threshold. This alarm is generated when the HDFS NameNode memory usage exceeds the threshold.</p>
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<p id="alm_14007__en-us_topic_0191813906_p45240216">This alarm is cleared when the HDFS NameNode 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_14007__en-us_topic_0191813906_section3951024"><h4 class="sectiontitle">Attribute</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="alm_14007__en-us_topic_0191813906_table40578897" frame="border" border="1" rules="all"><thead align="left"><tr id="alm_14007__en-us_topic_0191813906_row57539933"><th align="left" class="cellrowborder" valign="top" width="33.33333333333333%" id="mcps1.3.2.2.1.4.1.1"><p id="alm_14007__en-us_topic_0191813906_p30222983">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_14007__en-us_topic_0191813906_p32142578">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_14007__en-us_topic_0191813906_p53412038">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_14007__en-us_topic_0191813906_row31407785"><td class="cellrowborder" valign="top" width="33.33333333333333%" headers="mcps1.3.2.2.1.4.1.1 "><p id="alm_14007__en-us_topic_0191813906_p61002694">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_14007__en-us_topic_0191813906_p42271171">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_14007__en-us_topic_0191813906_p1412808">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_14007__en-us_topic_0191813906_section35559222"><h4 class="sectiontitle">Parameters</h4>
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<div class="tablenoborder"><table cellpadding="4" cellspacing="0" summary="" id="alm_14007__en-us_topic_0191813906_table47328638" frame="border" border="1" rules="all"><thead align="left"><tr id="alm_14007__en-us_topic_0191813906_row27247099"><th align="left" class="cellrowborder" valign="top" width="50%" id="mcps1.3.3.2.1.3.1.1"><p id="alm_14007__en-us_topic_0191813906_p59531373">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_14007__en-us_topic_0191813906_p57311924">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_14007__en-us_topic_0191813906_row11754296"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14007__en-us_topic_0191813906_p12573920">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_14007__en-us_topic_0191813906_p11854613">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_14007__en-us_topic_0191813906_row39582655"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14007__en-us_topic_0191813906_p52078514">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_14007__en-us_topic_0191813906_p57610085">Specifies the role for which the alarm is generated.</p>
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</td>
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</tr>
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<tr id="alm_14007__en-us_topic_0191813906_row48728718"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14007__en-us_topic_0191813906_p54712068">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_14007__en-us_topic_0191813906_p2492560">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_14007__en-us_topic_0191813906_row22433040"><td class="cellrowborder" valign="top" width="50%" headers="mcps1.3.3.2.1.3.1.1 "><p id="alm_14007__en-us_topic_0191813906_p5136981">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_14007__en-us_topic_0191813906_p13442339">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_14007__en-us_topic_0191813906_section51597550"><h4 class="sectiontitle">Impact on the System</h4><p id="alm_14007__en-us_topic_0191813906_p15087649">If the memory usage of the HDFS NameNode is too high, data read/write performance of HDFS will be affected.</p>
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</div>
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<div class="section" id="alm_14007__en-us_topic_0191813906_section61724767"><h4 class="sectiontitle">Possible Causes</h4><p id="alm_14007__en-us_topic_0191813906_p14140023">The HDFS NameNode memory is insufficient.</p>
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</div>
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<div class="section" id="alm_14007__en-us_topic_0191813906_section18651996"><h4 class="sectiontitle">Procedure</h4><ol id="alm_14007__en-us_topic_0191813906_ol12060007155049"><li class="tableheading" id="alm_14007__en-us_topic_0191813906_li4840004155049"><span>Delete unnecessary files.</span><p><ol type="a" id="alm_14007__en-us_topic_0191813906_ol40420929"><li id="alm_14007__en-us_topic_0191813906_li54597003">Use the client on the cluster node and run the <strong id="alm_14007__b188171349194016">hdfs dfs -rm -r</strong> <em id="alm_14007__i1782254917407">file or directory path</em> command to delete unnecessary files. </li><li id="alm_14007__en-us_topic_0191813906_li5659087">Wait 5 minutes and check whether the alarm is cleared.<ul class="subitemlist" id="alm_14007__en-us_topic_0191813906_ul50931783"><li id="alm_14007__en-us_topic_0191813906_li55732864">If yes, no further action is required.</li><li id="alm_14007__en-us_topic_0191813906_li31833731">If no, go to <a href="#alm_14007__en-us_topic_0191813906_li572522141314">2</a>.</li></ul>
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</li></ol>
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</p></li><li id="alm_14007__en-us_topic_0191813906_li572522141314"><a name="alm_14007__en-us_topic_0191813906_li572522141314"></a><a name="en-us_topic_0191813906_li572522141314"></a><span>Collect fault information.</span><p><ol type="a" id="alm_14007__en-us_topic_0191813906_en-us_topic_0191813935_ol6089206913036"><li id="alm_14007__en-us_topic_0191813906_en-us_topic_0191813935_li4478836213036">On MRS Manager, choose <span class="menucascade" id="alm_14007__menucascade125641112174110"><b><span class="uicontrol" id="alm_14007__uicontrol45581912174120">System</span></b> > <b><span class="uicontrol" id="alm_14007__uicontrol1156410126417">Export Log</span></b></span>.</li><li id="alm_14007__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_14007__en-us_topic_0191813906_section33650236"><h4 class="sectiontitle">Reference</h4><p id="alm_14007__en-us_topic_0191813906_p66727538">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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