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[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
[HDFS-2882] DN continues to start up, even if block pool fails to initialize - HDFS - [issue]
...I started a DN on a machine that was completely out of space on one of its drives. I saw the following:2012-02-02 09:56:50,499 FATAL org.apache.hadoop.hdfs.server.datanode.DataNode: Initiali...
http://issues.apache.org/jira/browse/HDFS-2882    Author: Todd Lipcon, 2015-02-13, 19:59
[HDFS-3519] Checkpoint upload may interfere with a concurrent saveNamespace - HDFS - [issue]
...TestStandbyCheckpoints failed in precommit build 2620 due to the following issue: both nodes were in Standby state, and configured to checkpoint "as fast as possible" NN1 starts to save its ...
http://issues.apache.org/jira/browse/HDFS-3519    Author: Todd Lipcon, 2015-01-23, 15:23
[HDFS-956] Improper synchronization in some FSNamesystem methods - HDFS - [issue]
...There are some methods in FSNamesystem that check isInSafeMode while not synchronized, and then proceed to perform operations. Thus the actual operations can occur after the NN has entered s...
http://issues.apache.org/jira/browse/HDFS-956    Author: Todd Lipcon, 2015-01-20, 00:48
[HDFS-2825] Add test hook to turn off the writer preferring its local DN - HDFS - [issue]
...Currently, the default block placement policy always places the first replica in the pipeline on the local node if there is a valid DN running there. In some network designs, within-rack ban...
http://issues.apache.org/jira/browse/HDFS-2825    Author: Todd Lipcon, 2014-12-16, 19:19
[HDFS-3342] SocketTimeoutException in BlockSender.sendChunks could have a better error message - HDFS - [issue]
...Currently, if a client connects to a DN and begins to read a block, but then stops calling read() for a long period of time, the DN will log a SocketTimeoutException "480000 millis timeout w...
http://issues.apache.org/jira/browse/HDFS-3342    Author: Todd Lipcon, 2014-10-31, 15:15
[HDFS-4176] EditLogTailer should call rollEdits with a timeout - HDFS - [issue]
...When the EditLogTailer thread calls rollEdits() on the active NN via RPC, it currently does so without a timeout. So, if the active NN has frozen (but not actually crashed), this call can ha...
http://issues.apache.org/jira/browse/HDFS-4176    Author: Todd Lipcon, 2014-10-30, 07:58
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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