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[HDFS-7435] PB encoding of block reports is very inefficient - HDFS - [issue]
...Block reports are encoded as a PB repeating long.  Repeating fields use an ArrayList with default capacity of 10.  A block report containing tens or hundreds of thousand of longs (...
http://issues.apache.org/jira/browse/HDFS-7435    Author: Daryn Sharp, 2014-11-24, 20:06
[HDFS-4882] Prevent the Namenode's LeaseManager from looping forever in checkLeases - HDFS - [issue]
...Scenario:1. cluster with 4 DNs2. the size of the file to be written is a little more than one block3. write the first block to 3 DNs, DN1->DN2->DN34. all the data packets of first bloc...
http://issues.apache.org/jira/browse/HDFS-4882    Author: Zesheng Wu, 2014-11-24, 19:51
[HDFS-7419] Improve error messages for DataNode hot swap drive feature - HDFS - [issue]
...When DataNode fails to add a volume, it adds one failure message to errorMessageBuilder in DataNode#refreshVolumes. However, the detailed error messages are not logged in DataNode's log and ...
http://issues.apache.org/jira/browse/HDFS-7419    Author: Lei, 2014-11-24, 19:51
[HDFS-7433] DatanodeMap lookups & DatanodeID hashCodes are inefficient - HDFS - [issue]
...The datanode map is currently a TreeMap.  For many thousands of datanodes, tree lookups are ~10X more expensive than a HashMap.  Insertions and removals are up to 100X more expensi...
http://issues.apache.org/jira/browse/HDFS-7433    Author: Daryn Sharp, 2014-11-24, 19:40
[HDFS-7430] Refactor the BlockScanner to use O(1) memory and use multiple threads - HDFS - [issue]
...We should update the BlockScanner to use a constant amount of memory by keeping track of what block was scanned last, rather than by tracking the scan status of all blocks in memory.  A...
http://issues.apache.org/jira/browse/HDFS-7430    Author: Colin Patrick McCabe, 2014-11-24, 19:23
[HDFS-7412] Move RetryCache to NameNodeRpcServer - HDFS - [issue]
...The concept of RetryCache belongs to the RPC layer.It would be nice to separate it from the implementation of FSNameSystem....
http://issues.apache.org/jira/browse/HDFS-7412    Author: Haohui Mai, 2014-11-24, 19:21
[HDFS-7436] Consolidate implementation of concat() - HDFS - [issue]
...The implementation of concat() scatters across both FSNameSystem and FSDirectory. This jira proposes to consolidate the implementation in a single class....
http://issues.apache.org/jira/browse/HDFS-7436    Author: Haohui Mai, 2014-11-24, 19:18
[HDFS-7428] Include path in the XML output of oiv - HDFS - [issue]
...When generating the XML output using hadoop oiv -p XML the path of a file is not printed, just the file name. While the complete path can be derived by parsing INodeDirectorySection and...
http://issues.apache.org/jira/browse/HDFS-7428    Author: Gautam Gopalakrishnan, 2014-11-24, 19:09
[HDFS-7342] Lease Recovery doesn't happen some times - HDFS - [issue]
...In some cases, LeaseManager tries to recover a lease, but is not able to. HDFS-4882 describes a possibility of that. We should fix this...
http://issues.apache.org/jira/browse/HDFS-7342    Author: Ravi Prakash, 2014-11-24, 18:53
[HDFS-7312] Update DistCp v1 to optionally not use tmp location - HDFS - [issue]
...DistCp v1 currently copies files to a tmp location and then renames that to the specified destination.  This can cause performance issues on filesystems such as S3.  A -skiptmp fla...
http://issues.apache.org/jira/browse/HDFS-7312    Author: Joseph Prosser, 2014-11-24, 18:14
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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