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[HDFS-5376] Incremental rescanning of cached blocks and cache entries - HDFS - [issue]
...CacheReplicationMonitor#rescan is invoked whenever a new cache entry is added or removed. This involves a complete rescan of all cache entries and cached blocks, which is potentially expensi...
http://issues.apache.org/jira/browse/HDFS-5376    Author: Andrew Wang , 2018-09-04, 23:15
[HDFS-11096] Support rolling upgrade between 2.x and 3.x - HDFS - [issue]
...trunk has a minimum software version of 3.0.0-alpha1. This means we can't rolling upgrade between branch-2 and trunk.This is a showstopper for large deployments. Unless there are very compel...
http://issues.apache.org/jira/browse/HDFS-11096    Author: Andrew Wang , 2018-07-03, 18:08
Releases table needs to be cleaned up - Hadoop - [mail # dev]
...Hi folks,https://hadoop.apache.org/releases.htmlThe table of releases here is supposed to only contain one row per releaseline. We've got a lot of old dupes at this point, e.g. 3.0.2, 2.9.0,...
   Author: Andrew Wang , 2018-07-02, 14:12
site doc cleanup - Hadoop - [mail # dev]
...It seems aggressive to delete docs just because a line hasn't had a recentrelease. We don't have a formal EOL policy for release lines, and oldreleases (particularly old clients) are still u...
   Author: Andrew Wang , 2018-07-02, 08:29
[expand - 1 more] - HADOOP-15124 review - Hadoop - [mail # dev]
...I think it's fine to ask for review help on the dev list, sometimes JIRAsare missed or get stuck. It also helps sometimes to git blame the filesyou're touching and see who is a likely review...
   Author: Andrew Wang , 2018-06-27, 05:21
[HDFS-13616] Batch listing of multiple directories - HDFS - [issue]
...One of the dominant workloads for external metadata services is listing of partition directories. This can end up being bottlenecked on RTT time when partition directories contain a small nu...
http://issues.apache.org/jira/browse/HDFS-13616    Author: Andrew Wang , 2018-06-19, 13:31
[ANNOUNCE] New Apache Hadoop PMC: Sean Mackrory - Hadoop - [mail # gen]
...Welcome and congratulations Sean!On Thu, Jun 14, 2018 at 12:11 PM Yufei Gu  wrote:> Congratulations Sean!!>> Best,>> Yufei>> `This is not a contribution`>>>...
   Author: Andrew Wang , 2018-06-14, 19:12
[YARN-6142] Support rolling upgrade between 2.x and 3.x - YARN - [issue]
...Counterpart JIRA to HDFS-11096. We need to: examine YARN and MR's  JACC report for binary and source incompatibilities run the PB differ that Sean wrote for HDFS-11096 for the YARN PBs....
http://issues.apache.org/jira/browse/YARN-6142    Author: Andrew Wang , 2018-05-29, 22:12
[HDFS-13611] Unsafe use of Text as a ConcurrentHashMap key in PBHelperClient - HDFS - [issue]
...Follow on to HDFS-13601, a bug spotted by Todd Lipcon: since Text is mutable, it's not safe to use as a hash map key....
http://issues.apache.org/jira/browse/HDFS-13611    Author: Andrew Wang , 2018-05-26, 14:39
[HDFS-13601] Optimize ByteString conversions in PBHelper - HDFS - [issue]
...While doing some profiling of the NN with JMC, I saw a lot of time being spent on String->ByteString conversions. These are often the same strings being converted over and over again, mea...
http://issues.apache.org/jira/browse/HDFS-13601    Author: Andrew Wang , 2018-05-23, 07:21