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[HDFS-8008] Support client-side back off when the datanodes are congested - HDFS - [issue]
...HDFS-7270 introduces the mechanism for DataNode to signal congestions. DFSClient should be able to recognize the signals and back off....
http://issues.apache.org/jira/browse/HDFS-8008    Author: Haohui Mai, 2015-04-02, 15:56
[HDFS-7270] Add congestion signaling capability to DataNode write protocol - HDFS - [issue]
...When a client writes to HDFS faster than the disk bandwidth of the DNs, it  saturates the disk bandwidth and put the DNs unresponsive. The client only backs off by aborting / recovering...
http://issues.apache.org/jira/browse/HDFS-7270    Author: Haohui Mai, 2015-04-01, 01:03
[HDFS-7486] Consolidate XAttr-related implementation into a single class - HDFS - [issue]
...This jira proposes to consolidate XAttr-related implementation in FSNamesystem and FSDirectory into a single class....
http://issues.apache.org/jira/browse/HDFS-7486    Author: Haohui Mai, 2015-03-31, 03:23
[HDFS-7985] WebHDFS should be always enabled - HDFS - [issue]
...Since 2.7 the HTML 5 UI depends on WebHDFS. Disabling WebHDFS will break the UI, thus WebHDFS should be always enabled....
http://issues.apache.org/jira/browse/HDFS-7985    Author: Haohui Mai, 2015-03-25, 17:39
[HDFS-7279] Use netty to implement DatanodeWebHdfsMethods - HDFS - [issue]
...Currently the DN implements all related webhdfs functionality using jetty. As the current jetty version the DN used (jetty 6) lacks of fine-grained buffer and connection management, DN often...
http://issues.apache.org/jira/browse/HDFS-7279    Author: Haohui Mai, 2015-03-20, 23:55
[HDFS-7697] Mark the PB OIV tool as experimental - HDFS - [issue]
...As par HDFS-6673, we need to document the applicable scope of the new PB OIV tool so that it won't catch users by surprise....
http://issues.apache.org/jira/browse/HDFS-7697    Author: Haohui Mai, 2015-03-19, 15:23
[HDFS-7945] The WebHdfs system on DN does not honor the length parameter - HDFS - [issue]
...HDFS-7279 introduces a new WebHdfs server on the DN. The new server does not honor the length parameter....
http://issues.apache.org/jira/browse/HDFS-7945    Author: Haohui Mai, 2015-03-19, 15:23
[HDFS-7406] SimpleHttpProxyHandler puts incorrect "Connection: Close" header - HDFS - [issue]
...tcpdump reveals that SimpleHttpProxyHandler puts incorrect values of the Connection header:Connection: io.netty.channel.ChannelFutureListener$1@36866933which should beConnection: close...
http://issues.apache.org/jira/browse/HDFS-7406    Author: Haohui Mai, 2015-03-17, 18:51
Re: upstream jenkins build broken? - HDFS - [mail # dev]
...+1 for git clean.Colin, can you please get it in ASAP? Currently due to the jenkinsissues, we cannot close the 2.7 blockers.Thanks,HaohuiOn Mon, Mar 16, 2015 at 11:54 AM, Colin P. McCabe &nb...
   Author: Haohui Mai, 2015-03-16, 20:44
[HDFS-7191] WebHDFS prematurely closes connections under high concurrent loads - HDFS - [issue]
...We're seeing the DN prematurely closes APPEND connections:{noformat]2014-09-22 23:53:12,721 WARN org.apache.hadoop.hdfs.web.resources.ExceptionHandler: INTERNAL_SERVER_ERRORjava.nio.channels...
http://issues.apache.org/jira/browse/HDFS-7191    Author: Haohui Mai, 2015-03-14, 00:31
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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