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[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
[HDFS-6401] WebHdfs should always use the network failover policy - HDFS - [issue]
...Webhdfs only uses the network failover policy if HA is enabled.  The policy adds retries for exceptions such as connect failures which are always useful.  The proxy also provides s...
http://issues.apache.org/jira/browse/HDFS-6401    Author: Daryn Sharp, 2014-05-14, 18:14
[HDFS-4437] Clients should not retain leases on moved files - HDFS - [issue]
...Moving open files and/or parent directories of open files will rewrite the leases to the new path.  The client is not notified so future stream operations will fail.  However, as l...
http://issues.apache.org/jira/browse/HDFS-4437    Author: Daryn Sharp, 2014-05-12, 19:16
[HDFS-6359] WebHdfs NN servlet issues redirects in safemode or standby - HDFS - [issue]
...Webhdfs does not check for safemode or standby during issuing a redirect for open/create/checksum calls....
http://issues.apache.org/jira/browse/HDFS-6359    Author: Daryn Sharp, 2014-05-08, 15:40
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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