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[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
[HDFS-7693] libhdfs: add hdfsFile cache - HDFS - [issue]
...Add an hdfsFile cache inside libhdfs....
http://issues.apache.org/jira/browse/HDFS-7693    Author: Colin Patrick McCabe, 2015-02-20, 21:33
[HDFS-7744] Fix potential NPE in DFSInputStream after setDropBehind or setReadahead is called - HDFS - [issue]
...Fix a potential NPE in DFSInputStream after setDropBehind or setReadahead is called.  These functions clear the blockReader, but don't set blockEnd to -1, which could lead to DFSInputSt...
http://issues.apache.org/jira/browse/HDFS-7744    Author: Colin Patrick McCabe, 2015-02-17, 08:12
[HDFS-7492] If multiple threads call FsVolumeList#checkDirs at the same time, we should only do checkDirs once and give the results to all waiting threads - HDFS - [issue]
...checkDirs is called when we encounter certain I/O errors.  It's rare to get just a single I/O error... normally you start getting many errors when a disk is going bad.  For this re...
http://issues.apache.org/jira/browse/HDFS-7492    Author: Colin Patrick McCabe, 2015-02-13, 22:27
[HDFS-7790] Do not create optional fields in DFSInputStream unless they are needed - HDFS - [issue]
...DFSInputStream#oneByteBuffer and DFSInputStream#extendedReadBuffers are only used some of the time, and they are always used under the positional lock.  Let's create them on demand to s...
http://issues.apache.org/jira/browse/HDFS-7790    Author: Colin Patrick McCabe, 2015-02-13, 15:25
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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