Marcus, One known issue in 0.18.3 is HADOOP-5465.
Copy&Paste from https://issues.apache.org/jira/browse/HADOOP-4489?focusedCommentId=12693 956&page=com.atlassian.jira.plugin.system.issuetabpanels%3Acomment-tabpa nel#action_12693956 Hairong said: " This bug might be caused by HADOOP-5465. Once a datanode hits HADOOP-5465, NameNode sends an empty replication request to the data node on every reply to a heartbeat, thus not a single scheduled block deletion request can be sent to the data node." (Also, if you're always writing from one of the nodes, that node is more likely to get full.) Nigel, not sure if this is the issue, but it would be nice to have 0.18.4 out. Koji -----Original Message----- From: Marcus Herou [mailto:marcus.he...@tailsweep.com] Sent: Tuesday, April 07, 2009 12:45 AM To: hadoop-u...@lucene.apache.org Subject: Very assymetric data allocation Hi. We are running Hadoop 0.18.3 and noticed a strange issue when one of our machines went out of disk yesterday. If you can see the table below it would display that the server "mapredcoord" is 66.91% allocated and the others are almost empty. How can that be ? Any information about this would be very helpful. mapredcoord is as well our jobtracker. //Marcus Node Last Contact Admin State Size (GB) Used (%) Used (%) Remaining (GB) Blocks mapredcoord<http://mapredcoord:50076/browseDirectory.jsp?namenodeInfoPor t=50070&dir=%2F>2In Service416.6966.91 90.9419806 mapreduce2<http://mapreduce2:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>2In Service416.696.71 303.54456 mapreduce3<http://mapreduce3:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>2In Service416.690.44 351.693975 mapreduce4<http://mapreduce4:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>0In Service416.690.25 355.821549 mapreduce5<http://mapreduce5:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>2In Service416.690.42 347.683995 mapreduce6<http://mapreduce6:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>0In Service416.690.43 352.73982 mapreduce7<http://mapreduce7:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>0In Service416.690.5 351.914079 mapreduce8<http://mapreduce8:50076/browseDirectory.jsp?namenodeInfoPort= 50070&dir=%2F>1In Service416.690.48 350.154169 -- Marcus Herou CTO and co-founder Tailsweep AB +46702561312 marcus.he...@tailsweep.com http://www.tailsweep.com/ http://blogg.tailsweep.com/
