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[HDFS-5239] Allow FSNamesystem lock fairness to be configurable - HDFS - [issue]
...The fairness of the FSNamesystem#fsLock is hardcoded to true.  Using an unfair lock provides a negligible increase to throughput.  However this is due to bottlenecks elsewhere in t...
http://issues.apache.org/jira/browse/HDFS-5239    Author: Daryn Sharp, 2014-09-04, 00:41
[HDFS-4232] NN fails to write a fsimage with stale leases - HDFS - [issue]
...The reading of a fsimage will ignore leases for non-existent files, but the writing of an image will fail if there are leases for non-existent files.  If the image contains leases that ...
http://issues.apache.org/jira/browse/HDFS-4232    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-4248] Renames may remove file leases - HDFS - [issue]
...Renames of directories may incorrectly remove the paths in leases under the tree being moved....
http://issues.apache.org/jira/browse/HDFS-4248    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-4247] saveNamespace should be tolerant of dangling lease - HDFS - [issue]
...Dangling leases to non-existent paths cause the NN to fail to start....
http://issues.apache.org/jira/browse/HDFS-4247    Author: Daryn Sharp, 2014-09-04, 00:24
[HDFS-3990] NN's health report has severe performance problems - HDFS - [issue]
...The dfshealth page will place a read lock on the namespace while it does a dns lookup for every DN.  On a multi-thousand node cluster, this often results in 10s+ load time for the healt...
http://issues.apache.org/jira/browse/HDFS-3990    Author: Daryn Sharp, 2014-09-04, 00:19
[HDFS-4532] RPC call queue may fill due to current user lookup - HDFS - [issue]
...Audit logging need to invoke UGI.getCurrentUser to log the user performing an operation.  This is a synch'ed method, so audit logging is effectively serializing the completion of concur...
http://issues.apache.org/jira/browse/HDFS-4532    Author: Daryn Sharp, 2014-09-03, 23:55
[HDFS-4542] Webhdfs doesn't support secure proxy users - HDFS - [issue]
...Webhdfs doesn't ever send the DoAsParam in the REST calls for proxy users.  Proxy users on a non-secure cluster "work" because the server sees them as the effective user, not a proxy us...
http://issues.apache.org/jira/browse/HDFS-4542    Author: Daryn Sharp, 2014-09-03, 23:55
[HDFS-6965] NN continues to issue block locations for DNs with full disks - HDFS - [issue]
...Encountered issues where DNs have less space than a full block and reject incoming transfers.  The NN continues giving out locations for these nodes for some period of time.  It do...
http://issues.apache.org/jira/browse/HDFS-6965    Author: Daryn Sharp, 2014-08-28, 20:43
[HDFS-6773] MiniDFSCluster should skip edit log fsync by default - 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, 2014-08-27, 21:44
[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
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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