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[HDFS-6764] DN heartbeats may become clumped together - HDFS - [issue]
...DNs send heartbeats on a fixed schedule based on the last time a heartbeat was sent.  If the NN takes longer to respond than the heartbeat interval then DNs do not sleep until the next ...
http://issues.apache.org/jira/browse/HDFS-6764    Author: Daryn Sharp, 2014-07-29, 17:00
[HDFS-6220] Webhdfs should differentiate remote exceptions - HDFS - [issue]
...Webhdfs's validateResponse should use a distinct exception for json decoded exceptions than it does for servlet exceptions.  Ex. A servlet generated 404 with a json payload should be di...
http://issues.apache.org/jira/browse/HDFS-6220    Author: Daryn Sharp, 2014-07-03, 06:28
[HDFS-6358] WebHdfs DN's DFSClient should not use a retry policy - HDFS - [issue]
...DFSClient retries on the DN are useless.  The webhdfs client is going to timeout before the retries complete.  The DFSClient will also continue to run until it timeouts....
http://issues.apache.org/jira/browse/HDFS-6358    Author: Daryn Sharp, 2014-07-03, 06:28
[HDFS-6221] Webhdfs should recover from dead DNs - HDFS - [issue]
...We've repeatedly observed the jetty acceptor thread silently dying in the DNs.  The webhdfs servlet may also "disappear" and jetty returns non-json 404s.One approach to make webhdfs mor...
http://issues.apache.org/jira/browse/HDFS-6221    Author: Daryn Sharp, 2014-07-03, 06:28
[HDFS-6313] WebHdfs may use the wrong NN when configured for multiple HA NNs - HDFS - [issue]
...WebHdfs resolveNNAddr will return a union of addresses for all HA configured NNs.  The client may access the wrong NN....
http://issues.apache.org/jira/browse/HDFS-6313    Author: Daryn Sharp, 2014-06-30, 09:18
[HDFS-6222] Remove background token renewer from webhdfs - HDFS - [issue]
...The background token renewer is a source of problems for long-running daemons.  Webhdfs should lazy fetch a new token when it receives an InvalidToken exception....
http://issues.apache.org/jira/browse/HDFS-6222    Author: Daryn Sharp, 2014-06-21, 16:19
[HDFS-6312] WebHdfs HA failover is broken on secure clusters - HDFS - [issue]
...When webhdfs does a failover, it blanks out the delegation token.  This will cause subsequent operations against the other NN to acquire a new token.  Tasks cannot acquire a token ...
http://issues.apache.org/jira/browse/HDFS-6312    Author: Daryn Sharp, 2014-06-20, 16:18
[HDFS-5477] Block manager as a service - HDFS - [issue]
...The block manager needs to evolve towards having the ability to run as a standalone service to improve NN vertical and horizontal scalability.  The goal is reducing the memory footprint...
http://issues.apache.org/jira/browse/HDFS-5477    Author: Daryn Sharp, 2014-06-19, 21:48
[HDFS-5453] Support fine grain locking in FSNamesystem - HDFS - [issue]
...The namesystem currently uses a course grain lock to control access.  This prevents concurrent writers in different branches of the tree, and prevents readers from accessing branches th...
http://issues.apache.org/jira/browse/HDFS-5453    Author: Daryn Sharp, 2014-06-19, 13:30
[HDFS-6305] WebHdfs response decoding may throw RuntimeExceptions - HDFS - [issue]
...WebHdfs does not guard against exceptions while decoding the response payload.  The json parser will throw RunTime exceptions on malformed responses.  The json decoding routines do...
http://issues.apache.org/jira/browse/HDFS-6305    Author: Daryn Sharp, 2014-05-15, 19:20
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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