https://community.cloudera.com/t5/Archives-of-Support-Questions/Secondary-Namenode-Connection-refused/m-p/100731#M13536 <P>am getting the below mentioned critical alerts in HDFS, please could you let me know whether secondary node process is mandatory for carrying out the activities or can it be ignored? if its mandatory let me know how to resolve this issue?</P><P>Connection failed to <A href="http://sandbox.hortonworks.com:50090" rel="nofollow noopener noreferrer" target="_blank">http://sandbox.hortonworks.com:50090</A> (&lt;urlopen error [Errno 111] Connection refused&gt;)</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="1084-secondarynamenode.jpg" style="width: 2259px;"><img src="https://community.cloudera.com/t5/image/serverpage/image-id/23782i91CE335C7A00A863/image-size/medium?v=v2&amp;px=400" role="button" title="1084-secondarynamenode.jpg" alt="1084-secondarynamenode.jpg" /></span></P> Fri, 16 Sep 2022 09:54:43 GMT haisure 2022-09-16T09:54:43Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Secondary-Namenode-Connection-refused/m-p/100731#M13536 <P>am getting the below mentioned critical alerts in HDFS, please could you let me know whether secondary node process is mandatory for carrying out the activities or can it be ignored? if its mandatory let me know how to resolve this issue?</P><P>Connection failed to <A href="http://sandbox.hortonworks.com:50090" rel="nofollow noopener noreferrer" target="_blank">http://sandbox.hortonworks.com:50090</A> (&lt;urlopen error [Errno 111] Connection refused&gt;)</P><P><span class="lia-inline-image-display-wrapper lia-image-align-inline" image-alt="1084-secondarynamenode.jpg" style="width: 2259px;"><img src="https://community.cloudera.com/t5/image/serverpage/image-id/23782i91CE335C7A00A863/image-size/medium?v=v2&amp;px=400" role="button" title="1084-secondarynamenode.jpg" alt="1084-secondarynamenode.jpg" /></span></P> Fri, 16 Sep 2022 09:54:43 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Secondary-Namenode-Connection-refused/m-p/100731#M13536 haisure 2022-09-16T09:54:43Z https://community.cloudera.com/t5/Archives-of-Support-Questions/Secondary-Namenode-Connection-refused/m-p/100732#M13537 <P>Its not needed on a single node. In the latest sandbox, this process has been turned off (maintenance mode) to conserve resources.</P><P>On the <A href="http://hortonworks.com/products/hortonworks-sandbox/#install">sandbox page</A>, see <A href="http://hortonworks.com/wp-content/uploads/2015/10/ReleaseNotes_10_27_2015.pdf">here</A> for sandbox release notes for the current sandbox under section "Services not started automatically". </P><PRE>HDFS SecondaryNameNode *Since on a single node, secondary namenode is not needed, it is not started. </PRE><P>For more details on what secondary name node does see <A href="https://wiki.apache.org/hadoop/FAQ#What_is_the_purpose_of_the_secondary_name-node.3F">here</A></P><P>If you are bored and have some time, <A href="https://www.youtube.com/watch?v=hEqQMLSXQlY">this video</A> also helps explain in way you won't soon forget <span class="lia-unicode-emoji" title=":slightly_smiling_face:">🙂</span></P> Fri, 25 Dec 2015 01:33:41 GMT https://community.cloudera.com/t5/Archives-of-Support-Questions/Secondary-Namenode-Connection-refused/m-p/100732#M13537 abajwa 2015-12-25T01:33:41Z