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[HDFS-5634] allow BlockReaderLocal to switch between checksumming and not - HDFS - [issue]
...BlockReaderLocal should be able to switch between checksumming and non-checksumming, so that when we get notifications that something is mlocked (see HDFS-5182), we can avoid checksumming wh...
http://issues.apache.org/jira/browse/HDFS-5634    Author: Colin Patrick McCabe, 2013-12-20, 22:19
[HDFS-5676] fix inconsistent synchronization of CachingStrategy - HDFS - [issue]
...Currently, the synchronization for CachingStrategy is a little inconsistent.  DFSOutputStream#setDropBehind modifies the strategy object, but there's nothing protecting that object agai...
http://issues.apache.org/jira/browse/HDFS-5676    Author: Colin Patrick McCabe, 2013-12-19, 19:54
[HDFS-5431] support cachepool-based limit management in path-based caching - HDFS - [issue]
...We should support cachepool-based limit management in path-based caching....
http://issues.apache.org/jira/browse/HDFS-5431    Author: Colin Patrick McCabe, 2013-12-18, 14:58
[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
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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