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[HDFS-4839] add NativeIO#mkdirs, that provides an error message on failure - HDFS - [issue]
...It would be nice to have a variant of mkdirs that provided an error message explaining why it failed.  This would make it easier to debug certain failing unit tests that rely on mkdir /...
http://issues.apache.org/jira/browse/HDFS-4839    Author: Colin Patrick McCabe, 2013-12-16, 01:48
[HDFS-5656] add some configuration keys to hdfs-default.xml - HDFS - [issue]
...Some configuration keys like dfs.client.read.shortcircuit are not present in hdfs-default.xml as they should be....
http://issues.apache.org/jira/browse/HDFS-5656    Author: Colin Patrick McCabe, 2013-12-13, 20:19
[HDFS-5521] skip checksums when reading a cached block via non-local reads - HDFS - [issue]
...The DataNode needs to skip checksumming when reading a cached block via non-local reads.  This is like HDFS-5182, but for non-short-circuit....
http://issues.apache.org/jira/browse/HDFS-5521    Author: Colin Patrick McCabe, 2013-12-05, 21:00
[HDFS-4997] libhdfs doesn't return correct error codes in most cases - HDFS - [issue]
...libhdfs has some code to translate Java exceptions into C error codes.  Unfortunately, the exceptions are returned to us in "dotted" format, but the code is expecting them to be in "sla...
http://issues.apache.org/jira/browse/HDFS-4997    Author: Colin Patrick McCabe, 2013-12-04, 13:39
[HDFS-5430] Support TTL on CacheDirectives - HDFS - [issue]
...It would be nice if CacheBasedPathDirectives would support an expiration time, after which they would be automatically removed by the NameNode.  This time would probably be in wall-bloc...
http://issues.apache.org/jira/browse/HDFS-5430    Author: Colin Patrick McCabe, 2013-11-28, 13:40
[HDFS-5556] add some more NameNode cache statistics, cache pool stats - HDFS - [issue]
...Add some more NameNode cache statistics and also cache pool statistics....
http://issues.apache.org/jira/browse/HDFS-5556    Author: Colin Patrick McCabe, 2013-11-28, 13:40
[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, 2013-11-27, 21:00
[HDFS-5543] fix narrow race condition in TestPathBasedCacheRequests - HDFS - [issue]
...TestPathBasedCacheRequests has a narrow race condition in testWaitForCachedReplicasInDirectory where an assert checking the number of bytes cached may fail.  The reason is because waitF...
http://issues.apache.org/jira/browse/HDFS-5543    Author: Colin Patrick McCabe, 2013-11-22, 13:27
[HDFS-5451] Add byte and file statistics to PathBasedCacheEntry - HDFS - [issue]
...It would be nice to have message at DEBUG level that described all the decisions we made for cache entries.  That way we could turn on this debugging to get more information.  We s...
http://issues.apache.org/jira/browse/HDFS-5451    Author: Colin Patrick McCabe, 2013-11-21, 13:27
[HDFS-5511] improve CacheManipulator interface to allow better unit testing - HDFS - [issue]
...The CacheManipulator interface has been helpful in allowing us to stub out mlock in cases where we don't want to test it.  We should move  the getMemlockLimit and getOperatingSyste...
http://issues.apache.org/jira/browse/HDFS-5511    Author: Colin Patrick McCabe, 2013-11-20, 13:27
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