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[HDFS-5591] Checkpointing should use monotonic time when calculating period - HDFS - [issue]
...Both StandbyCheckpointer and SecondaryNameNode use Time.now rather than Time.monotonicNow to calculate how long it's been since the last checkpoint. This can lead to issues when the system t...
http://issues.apache.org/jira/browse/HDFS-5591    Author: Andrew Wang, 2014-04-02, 14:32
[HDFS-5988] Bad fsimage always generated after upgrade - HDFS - [issue]
...Internal testing revealed an issue where, after upgrading from an earlier release, we always fail to save a correct PB-based fsimage (namely, missing inodes leading to an inconsistent namesp...
http://issues.apache.org/jira/browse/HDFS-5988    Author: Andrew Wang, 2014-03-25, 20:48
[HDFS-6151] HDFS should refuse to cache blocks >=2GB - HDFS - [issue]
...If you try to cache a block that's >=2GB, the DN will silently fail to cache it since MappedByteBuffer uses a signed int to represent size. Blocks this large are rare, but we should log o...
http://issues.apache.org/jira/browse/HDFS-6151    Author: Andrew Wang, 2014-03-24, 20:46
[HDFS-6093] Expose more caching information for debugging by users - HDFS - [issue]
...When users submit a new cache directive, it's unclear if the NN has recognized it and is actively trying to cache it, or if it's hung for some other reason. It'd be nice to expose a "pending...
http://issues.apache.org/jira/browse/HDFS-6093    Author: Andrew Wang, 2014-03-20, 21:25
[HDFS-6068] Disallow snapshot names that are also invalid directory names - HDFS - [issue]
...There are a number of restrictions on valid names in HDFS. For example, you can't name a directory "." or "..", or something containing a ":".However, I can happily create a snapshot named "...
http://issues.apache.org/jira/browse/HDFS-6068    Author: Andrew Wang, 2014-03-19, 14:59
[HDFS-6122] Rebalance cached replicas between datanodes - HDFS - [issue]
...It'd be nice if the NameNode was able to rebalance cache usage among datanodes. This would help avoid situations where the only three DNs with a replica are full and there is still cache spa...
http://issues.apache.org/jira/browse/HDFS-6122    Author: Andrew Wang, 2014-03-19, 01:46
[HDFS-6079] Timeout for getFileBlockStorageLocations does not work - HDFS - [issue]
...DistributedFileSystem#getFileBlockStorageLocations has a config value which lets clients set a timeout, but it's not being enforced correctly....
http://issues.apache.org/jira/browse/HDFS-6079    Author: Andrew Wang, 2014-03-13, 14:56
[HDFS-6070] Cleanup use of ReadStatistics in DFSInputStream - HDFS - [issue]
...Trivial little code cleanup related to DFSInputStream#ReadStatistics to use update methods rather than reaching in directly....
http://issues.apache.org/jira/browse/HDFS-6070    Author: Andrew Wang, 2014-03-11, 14:59
Re: problem with HDFS caching in Hadoop 2.3 - HDFS - [mail # dev]
...How was this cluster configured? Run dfsadmin -report to see the aggregateconfigured cache capacity as seen by the NN. You need to configure some GBsof cache on each DN and also raise the ul...
   Author: Andrew Wang, 2014-03-10, 06:34
Re: [VOTE] Merge HDFS-5535 Rolling Upgrade Improvement - HDFS - [mail # dev]
...Can we get an updated design doc posted to the JIRA? I'm not -1 oranything, but I asked for this on the JIRA just before the merge votestarted, and would like to see it posted soon.On Mon, M...
   Author: Andrew Wang, 2014-03-03, 18:57
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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