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[HDFS-13523] Support observer nodes in MiniDFSCluster - HDFS - [issue]
...MiniDFSCluster should support Observer nodes so that we can write decent integration tests....
http://issues.apache.org/jira/browse/HDFS-13523    Author: Erik Krogen , 2018-10-12, 05:48
[HDFS-13977] NameNode can kill itself if it tries to send too many txns to a QJM simultaneously - HDFS - [issue]
...Problem & LogsWe recently encountered an issue on a large cluster (running 2.7.4) in which the NameNode killed itself because it was unable to communicate with the JNs via QJM. We discov...
http://issues.apache.org/jira/browse/HDFS-13977    Author: Erik Krogen , 2018-10-10, 21:09
[HDFS-13791] Limit logging frequency of edit tail related statements - HDFS - [issue]
...There are a number of log statements that occur every time new edits are tailed by a Standby NameNode. When edits are tailing only on the order of every tens of seconds, this is fine. With t...
http://issues.apache.org/jira/browse/HDFS-13791    Author: Erik Krogen , 2018-09-27, 17:24
[HDFS-13930] Fix crlf line endings in HDFS-12943 branch - HDFS - [issue]
...One of the merge commits introduced the wrong line endings to some *.cmd files. Looks like it was commit 1363eff69c3 that broke it.The tree is:* |   1363eff69c3 2018-09-17 Merge commit ...
http://issues.apache.org/jira/browse/HDFS-13930    Author: Erik Krogen , 2018-09-24, 17:59
[HADOOP-15726] Create utility to limit frequency of log statements - Hadoop - [issue]
...There is a common pattern of logging a behavior that is normally extraneous. Under some circumstances, such a behavior becomes common, flooding the logs and making it difficult to see what e...
http://issues.apache.org/jira/browse/HADOOP-15726    Author: Erik Krogen , 2018-09-20, 17:01
[HDFS-13904] ContentSummary does not always respect processing limit, resulting in long lock acquisitions - HDFS - [issue]
...HDFS-4995 added a config dfs.content-summary.limit which allows for an administrator to set a limit on the number of entries processed during a single acquisition of the FSNamesystemLock dur...
http://issues.apache.org/jira/browse/HDFS-13904    Author: Erik Krogen , 2018-09-07, 21:57
[HDFS-13872] Only some protocol methods should perform msync wait - HDFS - [issue]
...Currently the implementation of msync added in HDFS-13767 waits until the server has caught up to the client-specified transaction ID regardless of what the inbound RPC is. This particularly...
http://issues.apache.org/jira/browse/HDFS-13872    Author: Erik Krogen , 2018-09-06, 21:43
[HDFS-13265] MiniDFSCluster should set reasonable defaults to reduce resource consumption - HDFS - [issue]
...MiniDFSCluster takes its defaults from DFSConfigKeys defaults, but many of these are not suitable for a unit test environment. For example, the default handler thread count of 10 is definite...
http://issues.apache.org/jira/browse/HDFS-13265    Author: Erik Krogen , 2018-09-04, 14:53
[HDFS-12421] Balancer to emit standard metrics - HDFS - [issue]
...The Balancer currently prints some statistics about its operation to stdout while it is running. This is fine if the balancer is manually run via CLI by an operator, but for the more common ...
http://issues.apache.org/jira/browse/HDFS-12421    Author: Erik Krogen , 2018-08-09, 20:20
[HDFS-13789] Reduce logging frequency of QuorumJournalManager#selectInputStreams - HDFS - [issue]
...As part of HDFS-13150, a logging statement was added to indicate whenever an edit tail is performed via the RPC mechanism. To enable low latency tailing, the tail frequency must be set very ...
http://issues.apache.org/jira/browse/HDFS-13789    Author: Erik Krogen , 2018-08-08, 20:12