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[HDFS-8989] Allow rate-limiting the DirectoryScanner via time-slicing - HDFS - [issue]
...When the inodes and directory entries for HDFS block and meta files are not in the cache, the DirectoryScanner can create enormous disk load via generating many seeks.  This can effecti...
http://issues.apache.org/jira/browse/HDFS-8989    Author: Colin Patrick McCabe, 2015-08-28, 21:27
[HDFS-8965] Harden edit log reading code against out of memory errors - HDFS - [issue]
...We should harden the edit log reading code against out of memory errors.  Now that each op has a length prefix and a checksum, we can validate the checksum before trying to load the Op ...
http://issues.apache.org/jira/browse/HDFS-8965    Author: Colin Patrick McCabe, 2015-08-28, 07:08
[HDFS-8924] Add pluggable interface for reading replicas in DFSClient - HDFS - [issue]
...We should add a pluggable interface for reading replicas in the DFSClient.  This could be used to implement short-circuit reads on systems without file descriptors, or for other optimiz...
http://issues.apache.org/jira/browse/HDFS-8924    Author: Colin Patrick McCabe, 2015-08-22, 05:56
[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, 2015-08-17, 22:38
[HDFS-5021] FSShell delete and FSShell rename should operate on symlinks, not their targets - HDFS - [issue]
...Currently FSShell delete and FSShell rename don't behave as expected on symlinks.  If you have /a/b/c as a link to /a/b/d, and you try to delete /a/b/c, the target /a/b/d will be delete...
http://issues.apache.org/jira/browse/HDFS-5021    Author: Colin Patrick McCabe, 2015-08-17, 17:11
[HDFS-8850] VolumeScanner thread exits with exception if there is no block pool to be scanned but there are suspicious blocks - HDFS - [issue]
...The VolumeScanner threads inside the BlockScanner exit with an exception if there is no block pool to be scanned but there are suspicious blocks....
http://issues.apache.org/jira/browse/HDFS-8850    Author: Colin Patrick McCabe, 2015-08-14, 09:02
[HDFS-7915] The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error - HDFS - [issue]
...The DataNode can sometimes allocate a ShortCircuitShm slot and fail to tell the DFSClient about it because of a network error.  In DataXceiver#requestShortCircuitFds, the DataNode can s...
http://issues.apache.org/jira/browse/HDFS-7915    Author: Colin Patrick McCabe, 2015-08-14, 02:19
[HDFS-7278] Add a command that allows sysadmins to manually trigger full block reports from a DN - HDFS - [issue]
...We should add a command that allows sysadmins to manually trigger full block reports from a DN....
http://issues.apache.org/jira/browse/HDFS-7278    Author: Colin Patrick McCabe, 2015-08-14, 02:16
[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, 2015-08-12, 13:19
[HDFS-4817] make HDFS advisory caching configurable on a per-file basis - HDFS - [issue]
...HADOOP-7753 and related JIRAs introduced some performance optimizations for the DataNode.  One of them was readahead.  When readahead is enabled, the DataNode starts reading the ne...
http://issues.apache.org/jira/browse/HDFS-4817    Author: Colin Patrick McCabe, 2015-07-16, 09:48
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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