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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, 2015-06-29, 18:04
[HDFS-8589] Fix unused imports in BPServiceActor and BlockReportLeaseManager - HDFS - [issue]
...Fix unused imports in BPServiceActor and BlockReportLeaseManager...
http://issues.apache.org/jira/browse/HDFS-8589    Author: Colin Patrick McCabe, 2015-06-18, 22:39
[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, 2015-06-17, 02:34
[HDFS-8469] Lockfiles are not being created for datanode storage directories - HDFS - [issue]
...Lockfiles are not being created for datanode storage directories.  Due to a mixup, we are initializing the StorageDirectory class with shared=true (an option which was only intended for...
http://issues.apache.org/jira/browse/HDFS-8469    Author: Colin Patrick McCabe, 2015-06-16, 01:44
[HDFS-7326] Add documentation for hdfs debug commands - HDFS - [issue]
...We should add documentation for hdfs debug commands....
http://issues.apache.org/jira/browse/HDFS-7326    Author: Colin Patrick McCabe, 2015-06-10, 14:00
[HDFS-8521] Add @VisibleForTesting annotation to {{BlockPoolSlice#selectReplicaToDelete}} - HDFS - [issue]
...Add @VisibleForTesting annotation to BlockPoolSlice#selectReplicaToDelete...
http://issues.apache.org/jira/browse/HDFS-8521    Author: Colin Patrick McCabe, 2015-06-03, 15:25
[HDFS-3488] BlockPoolSliceScanner#getNewBlockScanTime does not handle numbers > 31 bits properly - HDFS - [issue]
...This code does not handle the case where period > 2**31 properly:    long period = Math.min(scanPeriod,                   ...
http://issues.apache.org/jira/browse/HDFS-3488    Author: Colin Patrick McCabe, 2015-05-22, 12:52
[HDFS-8380] Always call addStoredBlock on blocks which have been shifted from one storage to another - HDFS - [issue]
...We should always call addStoredBlock on blocks which have been shifted from one storage to another....
http://issues.apache.org/jira/browse/HDFS-8380    Author: Colin Patrick McCabe, 2015-05-14, 16:48
[HDFS-6750] The DataNode should use its shared memory segment to mark short-circuit replicas that have been unlinked as stale - HDFS - [issue]
...The DataNode should mark short-circuit replicas that have been unlinked as stale.  This would prevent replicas that had been deleted from lingering in the DFSClient cache.  (At lea...
http://issues.apache.org/jira/browse/HDFS-6750    Author: Colin Patrick McCabe, 2015-05-12, 20:24
[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, 2015-05-06, 17:56
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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