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[HDFS-2115] Transparent compression in HDFS - HDFS - [issue]
...In practice, we find that a lot of users store text data in HDFS without using any compression codec. Improving usability of compressible formats like Avro/RCFile helps with this, but we cou...
http://issues.apache.org/jira/browse/HDFS-2115    Author: Todd Lipcon, 2015-03-10, 18:11
[HDFS-2956] calling fetchdt without a --renewer argument throws NPE - HDFS - [issue]
...If I call "bin/hdfs fetchdt /tmp/mytoken" without a "--renewer foo" argument, then it will throw a NullPointerException:Exception in thread "main" java.lang.NullPointerException   ...
http://issues.apache.org/jira/browse/HDFS-2956    Author: Todd Lipcon, 2015-03-10, 08:54
[HDFS-1787] "Not enough xcievers" error should propagate to client - HDFS - [issue]
...We find that users often run into the default transceiver limits in the DN. Putting aside the inherent issues with xceiver threads, it would be nice if the "xceiver limit exceeded" error pro...
http://issues.apache.org/jira/browse/HDFS-1787    Author: Todd Lipcon, 2015-03-10, 06:55
[HDFS-2174] Complete decoupling of failure states between edits and image dirs - HDFS - [issue]
...After HDFS-1073, there is no reason to couple the failure state of edits dirs and image dirs. However, there is still a small amount of coupling in that image dirs are restored only when edi...
http://issues.apache.org/jira/browse/HDFS-2174    Author: Todd Lipcon, 2015-03-10, 01:54
[HDFS-2213] DataNode gets stuck while shutting down minicluster - HDFS - [issue]
...I've seen a couple times where a unit test has timed out. jstacking shows the cluster is stuck trying to shut down one of the DataNode HTTP servers. The DataNodeBlockScanner thread also seem...
http://issues.apache.org/jira/browse/HDFS-2213    Author: Todd Lipcon, 2015-03-10, 01:51
[HDFS-2173] saveNamespace should not throw IOE when only one storage directory fails to write VERSION file - HDFS - [issue]
...This JIRA tracks a TODO in TestSaveNamespace. Currently, if, while writing the VERSION files in the storage directories, one of the directories fails, the entire operation throws IOE. This i...
http://issues.apache.org/jira/browse/HDFS-2173    Author: Todd Lipcon, 2015-03-10, 01:50
[HDFS-1497] Write pipeline sequence numbers should be sequential with no skips or duplicates - HDFS - [issue]
...In HDFS-895 we discovered that multiple hflush() calls in a row without intervening writes could cause a skip in sequence number. This doesn't seem to have any direct consequences, but we sh...
http://issues.apache.org/jira/browse/HDFS-1497    Author: Todd Lipcon, 2015-03-01, 08:08
[HDFS-3267] TestBlocksWithNotEnoughRacks races with DN startup - HDFS - [issue]
...In TestBlocksWithNotEnoughRacks.testCorruptBlockRereplicatedAcrossRacks, it restarts a DN, and then proceeds to call "waitCorruptReplicas". But, because of HDFS-3266, it doesn't actually wai...
http://issues.apache.org/jira/browse/HDFS-3267    Author: Todd Lipcon, 2015-03-01, 07:27
[HDFS-1148] Convert FSDataset to ReadWriteLock - HDFS - [issue]
...In benchmarking HDFS-941 I noticed that for the random read workload, the FSDataset lock is highly contended. After converting it to a ReentrantReadWriteLock, I saw a ~25% improvement on bot...
http://issues.apache.org/jira/browse/HDFS-1148    Author: Todd Lipcon, 2015-02-23, 15:11
Re: Datanode synchronization is horrible. I’m thinking we can use ReentrantReadWriteLock for synchronization. What do you guys think? - HDFS - [mail # dev]
...You might also be interested inhttps://issues.apache.org/jira/browse/HDFS-1148 which I worked on a bit anumber of years back. Per the last comment in that JIRA, I don't think it'svery valuab...
   Author: Todd Lipcon, 2015-02-17, 22:30
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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