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[HDFS-8791] block ID-based DN storage layout can be very slow for datanode on ext4 - HDFS - [issue]
...We are seeing cases where the new directory layout causes the datanode to basically cause the disks to seek for 10s of minutes. This can be when the datanode is running du, and it can also b...
http://issues.apache.org/jira/browse/HDFS-8791    Author: Nathan Roberts, 2015-08-04, 22:58
[HDFS-8404] Pending block replication can get stuck using older genstamp - HDFS - [issue]
...If an under-replicated block gets into the pending-replication list, but later the  genstamp of that block ends up being newer than the one originally submitted for replication, the blo...
http://issues.apache.org/jira/browse/HDFS-8404    Author: Nathan Roberts, 2015-07-31, 23:55
[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, 2015-07-31, 18:19
[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, 2015-07-22, 23:59
[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, 2015-06-24, 00:41
[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
[HDFS-6166] revisit balancer so_timeout - HDFS - [issue]
...HDFS-5806 changed the socket read timeout for the balancer connection to DN to 60 seconds. This works as long as balancer bandwidth is such that it's safe to assume that the DN will easily c...
http://issues.apache.org/jira/browse/HDFS-6166    Author: Nathan Roberts, 2014-03-31, 22:09
[HDFS-5806] balancer should set SoTimeout to avoid indefinite hangs - HDFS - [issue]
...Simple patch to avoid the balancer hanging when datanode stops responding to requests....
http://issues.apache.org/jira/browse/HDFS-5806    Author: Nathan Roberts, 2014-03-29, 16:25
[HDFS-5446] Consider supporting a mechanism to allow datanodes to drain outstanding work during rolling upgrade - HDFS - [issue]
...Rebuilding write pipelines is expensive and this can happen many times during a rolling restart of datanodes (i.e. during a rolling upgrade). It seems like it might help if datanodes could b...
http://issues.apache.org/jira/browse/HDFS-5446    Author: Nathan Roberts, 2014-02-13, 13:50
[HDFS-5788] listLocatedStatus response can be very large - HDFS - [issue]
...Currently we limit the size of listStatus requests to a default of 1000 entries. This works fine except in the case of listLocatedStatus where the location information can be quite large. As...
http://issues.apache.org/jira/browse/HDFS-5788    Author: Nathan Roberts, 2014-01-25, 13:38
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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