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[HDFS-4656] DN heartbeat loop can be briefly tight - HDFS - [issue]
...The DN hearbeat loop looks roughly like this:if (now - timeOfLastHeartbeat > configuredHeartbeatInterval) {  // do heartbeat}timeToWait = configuredHeartbeatInterval - (now - ti...
http://issues.apache.org/jira/browse/HDFS-4656    Author: Aaron T. Myers, 2013-04-04, 00:48
[HDFS-4655] DNA_FINALIZE is logged as being an unknown command by the DN when received from the standby NN - HDFS - [issue]
...This is harmless since the alternative is just to log the command as being ignored, but this bug results in a somewhat concerning error message appearing in the logs....
http://issues.apache.org/jira/browse/HDFS-4655    Author: Aaron T. Myers, 2013-04-02, 15:07
[HDFS-4614] FSNamesystem#getContentSummary should use getPermissionChecker helper method - HDFS - [issue]
...HDFS-4222 added this helper method and called it in most places, but missed one....
http://issues.apache.org/jira/browse/HDFS-4614    Author: Aaron T. Myers, 2013-03-20, 14:04
[HDFS-4591] HA clients can fail to fail over while Standby NN is performing long checkpoint - HDFS - [issue]
...Clients know to fail over to talk to the Active NN when they perform an RPC to the Standby NN and it throws a StandbyException. However, most places in the code that check if the NN is in th...
http://issues.apache.org/jira/browse/HDFS-4591    Author: Aaron T. Myers, 2013-03-14, 14:05
[HDFS-3256] HDFS considers blocks under-replicated if topology script is configured with only 1 rack - HDFS - [issue]
...HDFS treats the mere presence of a topology script being configured as evidence that there are multiple racks. If there is in fact only a single rack, the NN will try to place the blocks on ...
http://issues.apache.org/jira/browse/HDFS-3256    Author: Aaron T. Myers, 2013-03-14, 12:40
[HDFS-1564] Make dfs.datanode.du.reserved configurable per volume - HDFS - [issue]
...In clusters with DNs which have heterogeneous data dir volumes, it would be nice if dfs.datanode.du.reserved could be configured per-volume....
http://issues.apache.org/jira/browse/HDFS-1564    Author: Aaron T. Myers, 2013-03-08, 06:08
[HDFS-3266] DFSTestUtil#waitCorruptReplicas doesn't sleep between checks - HDFS - [issue]
...DFSTestUtil#waitCorruptReplicas runs a loop waiting for an expected number of corrupt replicas. Unfortunately, it doesn't sleep between iterations of this loop, causing tests to occasionally...
http://issues.apache.org/jira/browse/HDFS-3266    Author: Aaron T. Myers, 2013-03-07, 12:42
[HDFS-3727] When using SPNEGO, NN should not try to log in using KSSL principal - HDFS - [issue]
...When performing a checkpoint with security enabled, the NN will attempt to relogin from its keytab before making an HTTP request back to the 2NN to fetch the newly-merged image. However, it ...
http://issues.apache.org/jira/browse/HDFS-3727    Author: Aaron T. Myers, 2013-03-06, 09:55
Re: are the HDFS javadocs published on the website? - HDFS - [mail # dev]
...That sounds like a good plan to me.   Aaron T. Myers Software Engineer, Cloudera   On Sat, Feb 23, 2013 at 6:11 PM, Andrew Wang wrote:  ...
   Author: Aaron T. Myers, 2013-02-25, 19:19
[HDFS-4462] 2NN will fail to checkpoint after an HDFS upgrade from a pre-federation version of HDFS - HDFS - [issue]
...The 2NN currently has logic to detect when its on-disk FS metadata needs an upgrade with respect to the NN's metadata (i.e. the layout versions are different) and in this case it will procee...
http://issues.apache.org/jira/browse/HDFS-4462    Author: Aaron T. Myers, 2013-02-06, 12:40
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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