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[HDFS-7748] Separate ECN flags from the Status in the DataTransferPipelineAck - HDFS - [issue]
...Prior to the discussions on HDFS-7270, the old clients might fail to talk to the newer server when ECN is turned on. This jira proposes to separate the ECN flags in a separate protobuf field...
http://issues.apache.org/jira/browse/HDFS-7748    Author: Haohui Mai, 2015-03-28, 16:35
[HDFS-7060] Contentions of the monitor of FsDatasetImpl block DN's heartbeat - HDFS - [issue]
...We're seeing the heartbeat is blocked by the monitor of FsDatasetImpl when the DN is under heavy load of writes:   java.lang.Thread.State: BLOCKED (on object monitor)   &...
http://issues.apache.org/jira/browse/HDFS-7060    Author: Haohui Mai, 2015-03-28, 09:31
[HDFS-8009] Signal congestion on the DataNode - HDFS - [issue]
...The DataNode should signal congestion (i.e. "I'm too busy") in the PipelineAck using the mechanism introduced in HDFS-7270....
http://issues.apache.org/jira/browse/HDFS-8009    Author: Haohui Mai, 2015-03-28, 00:36
[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, 2015-03-28, 00:14
[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, 2015-03-28, 00:14
[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-7966] New Data Transfer Protocol via HTTP/2 - HDFS - [issue]
...The current Data Transfer Protocol (DTP) implements a rich set of features that span across multiple layers, including: Connection pooling and authentication (session layer) Encryption (pres...
http://issues.apache.org/jira/browse/HDFS-7966    Author: Haohui Mai, 2015-03-25, 04:59
[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
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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