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[HDFS-7923] The DataNodes should rate-limit their full block reports by asking the NN on heartbeat messages - HDFS - [issue]
...The DataNodes should rate-limit their full block reports.  They can do this by first sending a heartbeat message to the NN with an optional boolean set which requests permission to send...
http://issues.apache.org/jira/browse/HDFS-7923    Author: Colin Patrick McCabe, 2015-03-12, 21:21
[HDFS-7846] Create off-heap BlocksMap and BlockData structures - HDFS - [issue]
...Create off-heap BlocksMap, BlockInfo, and DataNodeInfo structures.  The BlocksMap will use the off-heap hash table....
http://issues.apache.org/jira/browse/HDFS-7846    Author: Colin Patrick McCabe, 2015-03-10, 21:00
[HDFS-7844] Create an off-heap hash table implementation - HDFS - [issue]
...Create an off-heap hash table implementation....
http://issues.apache.org/jira/browse/HDFS-7844    Author: Colin Patrick McCabe, 2015-03-10, 13:07
[HDFS-7909] Improve TestMemoryManager and TestProbingHashTable - HDFS - [issue]
...Improve TestMemoryManager and TestProbingHashTable.  Use parameterized tests rather than separate functions to test on-heap and off-heap variants.  Add more coverage to TestMemoryM...
http://issues.apache.org/jira/browse/HDFS-7909    Author: Colin Patrick McCabe, 2015-03-09, 23:11
[HDFS-7430] Rewrite 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, 2015-03-09, 08:42
[HDFS-6695] Investigate using Java 7's nonblocking file I/O in BlockReaderLocal to implement read timeouts - HDFS - [issue]
...In BlockReaderLocal, the "read" system call could block for a long time if the disk drive is having problems, or there is a huge amount of I/O contention.  This might cause poor latency...
http://issues.apache.org/jira/browse/HDFS-6695    Author: Colin Patrick McCabe, 2015-03-06, 21:35
[HDFS-7845] Compress block reports - HDFS - [issue]
...We should optionally compress block reports using a low-cpu codec such as lz4 or snappy....
http://issues.apache.org/jira/browse/HDFS-7845    Author: Colin Patrick McCabe, 2015-03-03, 17:29
[HDFS-7817] libhdfs3: fix strerror_r detection - HDFS - [issue]
...The signature of strerror_r is not quite detected correctly in libhdfs3.  The code assumes that int foo = strerror_r will fail to compile with the GNU type signature, but this is not th...
http://issues.apache.org/jira/browse/HDFS-7817    Author: Colin Patrick McCabe, 2015-03-02, 19:52
[HDFS-7848] Use off-heap BlocksMap, BlockInfo, etc. in FSNamesystem - HDFS - [issue]
...Use off-heap BlocksMap, BlockInfo, etc. in FSNamesystem...
http://issues.apache.org/jira/browse/HDFS-7848    Author: Colin Patrick McCabe, 2015-02-26, 03:04
[HDFS-7807] libhdfs htable.c: fix htable resizing, add unit test - HDFS - [issue]
...libhdfs htable.c: fix htable resizing, add unit test...
http://issues.apache.org/jira/browse/HDFS-7807    Author: Colin Patrick McCabe, 2015-02-24, 15:21
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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