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[HDFS-5000] DataNode configuration should allow specifying storage type - HDFS - [issue]
...The DataNode configuration should allow the administrator to optionally specify the storage type for each storage directory.The DataNode should send the storage type with the block report....
http://issues.apache.org/jira/browse/HDFS-5000    Author: Arpit Agarwal, 2015-04-28, 22:03
[HDFS-6929] NN periodically unlinks lazy persist files with missing replicas from namespace - HDFS - [issue]
...Occasional data loss is expected when using the lazy persist flag due to node restarts. The NN will optionally unlink lazy persist files from the namespace to avoid them from showing up as c...
http://issues.apache.org/jira/browse/HDFS-6929    Author: Arpit Agarwal, 2015-04-28, 11:12
[HDFS-8163] Using monotonicNow for block report scheduling causes test failures on recently restarted systems - HDFS - [issue]
...BPServiceActor#blockReport has the following check:  List<DatanodeCommand> blockReport() throws IOException {    // send block report if timer has expired.&nbs...
http://issues.apache.org/jira/browse/HDFS-8163    Author: Arpit Agarwal, 2015-04-22, 14:41
[HDFS-8157] Writes to RAM DISK reserve locked memory for block files - HDFS - [issue]
...Per discussion on HDFS-6919, the first step is that writes to RAM disk will reserve locked memory via the FsDatasetCache....
http://issues.apache.org/jira/browse/HDFS-8157    Author: Arpit Agarwal, 2015-04-21, 06:07
[HDFS-6919] Enforce a single limit for RAM disk usage and replicas cached via locking - HDFS - [issue]
...The DataNode can have a single limit for memory usage which applies to both replicas cached via CCM and replicas on RAM disk.See comments 1, 2 and 3 for discussion....
http://issues.apache.org/jira/browse/HDFS-6919    Author: Arpit Agarwal, 2015-04-21, 02:11
[HDFS-8192] Eviction should key off used locked memory instead of ram disk free space - HDFS - [issue]
...Followup to HDFS-8157, eviction from RAM disk should be triggered when locked memory is low. More details later....
http://issues.apache.org/jira/browse/HDFS-8192    Author: Arpit Agarwal, 2015-04-21, 02:05
[HDFS-8152] Refactoring of lazy persist storage cases - HDFS - [issue]
...Add a builder pattern to make it easier to test new configurations....
http://issues.apache.org/jira/browse/HDFS-8152    Author: Arpit Agarwal, 2015-04-20, 16:33
[HDFS-8144] Split TestLazyPersistFiles into multiple tests - HDFS - [issue]
...TestLazyPersistFiles has grown too large and includes both NN and DN tests. We can split up related tests into smaller files to keep the test case manageable....
http://issues.apache.org/jira/browse/HDFS-8144    Author: Arpit Agarwal, 2015-04-16, 16:36
[HDFS-7596] NameNode should prune dead storages from storageMap - HDFS - [issue]
...The NameNode must be able to prune storages that are no longer reported by the DataNode and that have no blocks associated. These stale storages can skew the balancer behavior.Detailed discu...
http://issues.apache.org/jira/browse/HDFS-7596    Author: Arpit Agarwal, 2015-04-10, 21:30
[HDFS-6581] Write to single replica in memory - HDFS - [issue]
...Per discussion with the community on HDFS-5851, we will implement writing to a single replica in DN memory via DataTransferProtocol.This avoids some of the issues with short-circuit writes, ...
http://issues.apache.org/jira/browse/HDFS-6581    Author: Arpit Agarwal, 2015-04-10, 03:47
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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