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[HDFS-7938] OpensslSecureRandom.c pthread_threadid_np usage signature is wrong on 32-bit Mac - HDFS - [issue]
...In OpensslSecureRandom.c, pthread_threadid_np is being used with an unsigned long, but the type signature requires a uint64_t....
http://issues.apache.org/jira/browse/HDFS-7938    Author: Colin Patrick McCabe, 2015-03-30, 17:50
[HDFS-6450] Support non-positional hedged reads in HDFS - HDFS - [issue]
...HDFS-5776 added support for hedged positional reads.  We should also support hedged non-position reads (aka regular reads)....
http://issues.apache.org/jira/browse/HDFS-6450    Author: Colin Patrick McCabe, 2015-03-26, 21:12
[HDFS-7965] TestTracing#testWriteTraceHooks is flaky - HDFS - [issue]
...TestTracing#testWriteTraceHooks is flaky.  It seems to be timing out in trunk....
http://issues.apache.org/jira/browse/HDFS-7965    Author: Colin Patrick McCabe, 2015-03-26, 18:50
[HDFS-7847] Modify NNThroughputBenchmark to be able to operate on a remote NameNode - HDFS - [issue]
...Modify NNThroughputBenchmark to be able to operate on a NN that is not in process. A followon Jira will modify it some more to allow quantifying native and java heap sizes, and some latency ...
http://issues.apache.org/jira/browse/HDFS-7847    Author: Colin Patrick McCabe, 2015-03-20, 11:53
[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
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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