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[HDFS-7742] favoring decommissioning node for replication can cause a block to stay underreplicated for long periods - HDFS - [issue]
...When choosing a source node to replicate a block from, a decommissioning node is favored. The reason for the favoritism is that decommissioning nodes aren't servicing any writes so in-theory...
http://issues.apache.org/jira/browse/HDFS-7742    Author: Nathan Roberts, 2015-03-28, 01:18
[HDFS-7645] Rolling upgrade is restoring blocks from trash multiple times - HDFS - [issue]
...When performing an HDFS rolling upgrade, the trash directory is getting restored twice when under normal circumstances it shouldn't need to be restored at all. iiuc, the only time these bloc...
http://issues.apache.org/jira/browse/HDFS-7645    Author: Nathan Roberts, 2015-03-27, 14:29
[YARN-3388] userlimit isn't playing well with DRF calculator - YARN - [issue]
...When there are multiple active users in a queue, it should be possible for those users to make use of capacity up-to max_capacity (or close). The resources should be fairly distributed among...
http://issues.apache.org/jira/browse/YARN-3388    Author: Nathan Roberts, 2015-03-26, 20:07
[MAPREDUCE-3094] org.apache.hadoop.streaming.TestUlimit.testCommandLine fails intermittantly in 20.205.0 - MapReduce - [issue]
...11/09/24 00:22:10 INFO mapred.TaskInProgress: Error from attempt_20110924002157563_0001_m_000000_0: java.lang.RuntimeException: PipeMapRed.waitOutputThreads(): subprocess failed with code 13...
http://issues.apache.org/jira/browse/MAPREDUCE-3094    Author: Nathan Roberts, 2015-03-20, 00:40
[YARN-3309] Capacity scheduler can wait a very long time for node locality - YARN - [issue]
...The capacity scheduler will delay scheduling a container on a rack-local node in hopes that a node-local opportunity will come along (YARN-80). It does this by counting the number of missed ...
http://issues.apache.org/jira/browse/YARN-3309    Author: Nathan Roberts, 2015-03-10, 01:27
[YARN-2809] Implement workaround for linux kernel panic when removing cgroup - YARN - [issue]
...Some older versions of linux have a bug that can cause a kernel panic when the LCE attempts to remove a cgroup. It is a race condition so it's a bit rare but on a few thousand node cluster i...
http://issues.apache.org/jira/browse/YARN-2809    Author: Nathan Roberts, 2015-02-17, 08:12
[YARN-1975] Used resources shows escaped html in CapacityScheduler and FairScheduler page - YARN - [issue]
...Used resources displays as <memory:1111, vCores;> with capacity scheduler...
http://issues.apache.org/jira/browse/YARN-1975    Author: Nathan Roberts, 2015-01-22, 14:24
[HDFS-6407] new namenode UI, lost ability to sort columns in datanode tab - HDFS - [issue]
...old ui supported clicking on column header to sort on that column. The new ui seems to have dropped this very useful feature.There are a few tables in the Namenode UI to display  datano...
http://issues.apache.org/jira/browse/HDFS-6407    Author: Nathan Roberts, 2015-01-16, 19:17
[HDFS-5535] Umbrella jira for improved HDFS rolling upgrades - HDFS - [issue]
...In order to roll a new HDFS release through a large cluster quickly and safely, a few enhancements are needed in HDFS. An initial High level design document will be attached to this jira, an...
http://issues.apache.org/jira/browse/HDFS-5535    Author: Nathan Roberts, 2014-12-18, 19:10
[YARN-2904] Use linux cgroups to enhance container tear down - YARN - [issue]
...If we are launching yarn containers within cgroups, linux provides some guarantees that can help completely tear down a container.  Specifically, linux guarantees that tasks can't escap...
http://issues.apache.org/jira/browse/YARN-2904    Author: Nathan Roberts, 2014-11-25, 21:20
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB