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[HDFS-6900] Eliminate DU thread per block pool slice - HDFS - [issue]
...We use one DU thread per block pool slice to compute disk usage information. In addition to the thread overhead this results in the disk usage information being out of date for up to 10 minu...
http://issues.apache.org/jira/browse/HDFS-6900    Author: Arpit Agarwal, 2014-08-26, 00:16
[HDFS-6933] Skip checksum verification when reading from memory - HDFS - [issue]
...Checksum verification can be skipped when reading from replicas on local RAM disk....
http://issues.apache.org/jira/browse/HDFS-6933    Author: Arpit Agarwal, 2014-08-25, 11:49
[HDFS-6910] Initial prototype implementation for replicas in memory using tmpfs - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-6910    Author: Arpit Agarwal, 2014-08-23, 22:13
[HDFS-6918] Investigate eviction from RAM disk via file truncation - HDFS - [issue]
...We proposed evicting blocks from RAM disk by just deleting the file. Assuming the client completes its read quickly the block will be deleted when the client closes its handle.Colin Patrick ...
http://issues.apache.org/jira/browse/HDFS-6918    Author: Arpit Agarwal, 2014-08-23, 21:58
[HDFS-6899] Allow changing MiniDFSCluster volumes per DN and capacity per volume - HDFS - [issue]
...MiniDFSCluster hardcodes the number of directories per volume to two. Propose removing the hard-coded restriction.It would be useful to limit the capacity of individual storage directories f...
http://issues.apache.org/jira/browse/HDFS-6899    Author: Arpit Agarwal, 2014-08-23, 16:07
[HDFS-5851] Support memory as a storage medium - HDFS - [issue]
...Memory can be used as a storage medium for smaller/transient files for fast write throughput.More information/design will be added later....
http://issues.apache.org/jira/browse/HDFS-5851    Author: Arpit Agarwal, 2014-08-23, 06:45
[HDFS-6758] block writer should pass the expected block size to DataXceiverServer - HDFS - [issue]
...DataXceiver initializes the block size to the default block size for the cluster. This size is later used by the FsDatasetImpl when applying VolumeChoosingPolicy.    block.set...
http://issues.apache.org/jira/browse/HDFS-6758    Author: Arpit Agarwal, 2014-08-21, 20:44
[HDFS-6907] Source files missing license headers - HDFS - [issue]
...The following files were committed without license headers as flagged by Jenkins. !????? /home/jenkins/jenkins-slave/workspace/PreCommit-HDFS-Build/trunk/hadoop-hdfs-project/hadoop-hdfs...
http://issues.apache.org/jira/browse/HDFS-6907    Author: Arpit Agarwal, 2014-08-21, 19:13
[HDFS-5151] Add test case for commitBlockSynchronization with invalid Storage - HDFS - [issue]
...Per title, we need a new test case to cover this....
http://issues.apache.org/jira/browse/HDFS-5151    Author: Arpit Agarwal, 2014-08-20, 18:07
[expand - 1 more] - Re: [DISCUSS] Switch to log4j 2 - HDFS - [mail # dev]
...The block state change logs are indeed too noisy at INFO and I've not foundthem useful when troubleshooting. Just filed HDFS-6860 to fix that.This is orthogal to SLF4J migration however movi...
   Author: Arpit Agarwal, 2014-08-17, 18:16
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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