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[HDFS-8088] Reduce the number of HTrace spans generated by HDFS reads - HDFS - [issue]
...HDFS generates too many trace spans on read right now.  Every call to read() we make generates its own span, which is not very practical for things like HBase or Accumulo that do many s...
http://issues.apache.org/jira/browse/HDFS-8088    Author: Colin Patrick McCabe, 2015-04-16, 21:19
[HDFS-7054] Make DFSOutputStream tracing more fine-grained - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-7054    Author: Colin Patrick McCabe, 2015-04-10, 21:30
[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, 2015-04-06, 20:48
[HDFS-7055] Add tracing to DFSInputStream - HDFS - [issue]
...Add tracing to DFSInputStream....
http://issues.apache.org/jira/browse/HDFS-7055    Author: Colin Patrick McCabe, 2015-04-06, 20:43
[HDFS-6917] Add an hdfs debug command to validate blocks, call recoverlease, etc. - HDFS - [issue]
...HDFS should have a debug command which could validate HDFS block files, call recoverLease, and have some other functionality.  These commands would be purely for debugging and would app...
http://issues.apache.org/jira/browse/HDFS-6917    Author: Colin Patrick McCabe, 2015-04-03, 18:56
[HDFS-8026] Trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk - HDFS - [issue]
...We should trace FSOutputSummer#writeChecksumChunks rather than DFSOutputStream#writeChunk.  When tracing writeChunk, we get a new trace span every 512 bytes; when tracing writeChecksumC...
http://issues.apache.org/jira/browse/HDFS-8026    Author: Colin Patrick McCabe, 2015-04-02, 15:57
[HDFS-7446] HDFS inotify should have the ability to determine what txid it has read up to - HDFS - [issue]
...HDFS inotify should have the ability to determine what txid it has read up to.  This will allow users who want to avoid missing any events to record this txid and use it to resume readi...
http://issues.apache.org/jira/browse/HDFS-7446    Author: Colin Patrick McCabe, 2015-04-02, 00:19
[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, 2015-04-01, 20:27
[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, 2015-04-01, 20:27
[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
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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