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[HDFS-6934] Move checksum computation off the hot path when writing to RAM disk - HDFS - [issue]
...Since local RAM is considered reliable we can avoid writing checksums on the hot path when replicas are being written to a local RAM disk.The checksum can be computed by the lazy writer when...
http://issues.apache.org/jira/browse/HDFS-6934    Author: Arpit Agarwal, 2014-10-28, 14:21
[HDFS-6988] Add configurable limit for percentage-based eviction threshold - HDFS - [issue]
...Per feedback from Colin Patrick McCabe on HDFS-6930, we can make the eviction thresholds configurable. The hard-coded thresholds may not be appropriate for very large RAM disks....
http://issues.apache.org/jira/browse/HDFS-6988    Author: Arpit Agarwal, 2014-10-23, 03:00
[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, 2014-10-22, 16:11
[HDFS-7112] LazyWriter should use either async IO or one thread per physical disk - HDFS - [issue]
...The LazyWriter currently uses synchronous IO and a single thread. This limits the throughput to that of a single disk. Using either async overlapped IO or one thread per physical disk will i...
http://issues.apache.org/jira/browse/HDFS-7112    Author: Arpit Agarwal, 2014-10-18, 03:05
[HDFS-7090] Use unbuffered writes when persisting in-memory replicas - HDFS - [issue]
...The LazyWriter thread just uses FileUtils.copyFile to copy block files to persistent storage. It would be better to use unbuffered writes to avoid churning page cache....
http://issues.apache.org/jira/browse/HDFS-7090    Author: Arpit Agarwal, 2014-10-18, 03:04
[HDFS-7171] Fix Jenkins failures in HDFS-6581 branch - HDFS - [issue]
...Jenkins flagged a few failures with the latest merge patch.Test results: https://builds.apache.org/job/PreCommit-HDFS-Build/8269//testReport/Findbugs warnings: https://builds.apache.org/job/...
http://issues.apache.org/jira/browse/HDFS-7171    Author: Arpit Agarwal, 2014-10-18, 03:04
[HDFS-7129] Metrics to track usage of memory for writes - HDFS - [issue]
...A few metrics to evaluate feature usage and suggest improvements. Thanks to Suresh Srinivas for some of these suggestions. Number of times a block in memory was read (before being ejected) A...
http://issues.apache.org/jira/browse/HDFS-7129    Author: Arpit Agarwal, 2014-10-18, 03:03
[HDFS-7159] Use block storage policy to set lazy persist preference - HDFS - [issue]
...Now that HDFS-6584 feature is ready and supports block storage policies on both files and directories, we can make use of Storage Policies to store the LAZY_PERSIST preference.This only affe...
http://issues.apache.org/jira/browse/HDFS-7159    Author: Arpit Agarwal, 2014-10-18, 03:03
[HDFS-7155] Bugfix in createLocatedFileStatus caused by bad merge - HDFS - [issue]
...FsDirectory.createLocatedFileStatus fails to initialize the blockSize.Likely caused by a bad merge....
http://issues.apache.org/jira/browse/HDFS-7155    Author: Arpit Agarwal, 2014-10-18, 03:02
[HDFS-6932] Balancer and Mover tools should ignore replicas on RAM_DISK - HDFS - [issue]
...Per title, balancer and mover should just ignore replicas on RAM disk instead of attempting to move them to other nodes....
http://issues.apache.org/jira/browse/HDFS-6932    Author: Arpit Agarwal, 2014-10-18, 02:59
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