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[HDFS-6773] MiniDFSCluster can run dramatically faster - HDFS - [issue]
...The mini cluster is unnecessarily running with durable edit logs.  The following change cut runtime of a single test from ~30s to ~10s.EditLogFileOutputStream.setShouldSkipFsyncForTesti...
http://issues.apache.org/jira/browse/HDFS-6773    Author: Daryn Sharp, 2014-08-01, 20:36
[HDFS-3905] Secure cluster cannot use hftp to an insecure cluster - HDFS - [issue]
...HDFS-3873 fixed the case where all exceptions acquiring tokens for hftp were ignored.  Jobs would be submitted sans tokens, and then the tasks would eventually all fail trying to get th...
http://issues.apache.org/jira/browse/HDFS-3905    Author: Daryn Sharp, 2014-07-30, 00:02
[HDFS-6763] Standby NN stalls after processing edits - HDFS - [issue]
...FSImage#loadEdits calls updateCountForQuota to recalculate & verify quotas for the entire namespace.  A standby NN using shared edits calls this method every minute.  The stand...
http://issues.apache.org/jira/browse/HDFS-6763    Author: Daryn Sharp, 2014-07-29, 17:17
[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-6326] WebHdfs ACL compatibility is broken - HDFS - [issue]
...2.4 ACL support is completely incompatible with <2.4 webhdfs servers.  The NN throws an IllegalArgumentException exception.hadoop fs -ls webhdfs://nn/Found 21 itemsls: Invalid value ...
http://issues.apache.org/jira/browse/HDFS-6326    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
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