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[HDFS-7788] Post-2.6 namenode may not start up with an image containing inodes created with an old release. - HDFS - [issue]
...Before HDFS-4305, which was fixed in 2.1.0-beta, clients could specify arbitrarily small preferred block size for a file including 0. This was normally done by faulty clients or failed creat...
http://issues.apache.org/jira/browse/HDFS-7788    Author: Kihwal Lee, 2015-02-22, 15:25
[HDFS-7809] Block and lease recovery failure caused by snapshot issue - HDFS - [issue]
...On a cluster running 2.5, we have observed a decommissioning failure due to a file that had been under construction for 3 days.  It turned out that the file was abandoned and a lease re...
http://issues.apache.org/jira/browse/HDFS-7809    Author: Kihwal Lee, 2015-02-18, 20:39
[HDFS-7795] Show warning if not all favored nodes were chosen by namenode - HDFS - [issue]
...Namenode may not choose all of fovored nodes specified by a client. In that case, it will be nice if a relevant message is shown to the client....
http://issues.apache.org/jira/browse/HDFS-7795    Author: Kihwal Lee, 2015-02-18, 15:30
Erratic Jenkins behavior - HDFS - [mail # dev]
...I am sure many of us have seen strange jenkins behavior out of the precommit builds. - build artifacts missing- serving build artifact belonging to another build. This also causes wrong prec...
   Author: Kihwal Lee, 2015-02-05, 17:50
[HDFS-6651] Deletion failure can leak inodes permanently - HDFS - [issue]
...As discussed in HDFS-6618, if a deletion of tree fails in the middle, any collected inodes and blocks will not be removed from INodeMap and BlocksMap. Since fsimage is saved by iterating ove...
http://issues.apache.org/jira/browse/HDFS-6651    Author: Kihwal Lee, 2015-02-03, 15:22
[HDFS-7603] The background replication queue initialization may not let others run - HDFS - [issue]
...The background replication queue initialization processes configured number of blocks at a time and releases the namesystem write lock.  This was to let namenode start serving right aft...
http://issues.apache.org/jira/browse/HDFS-7603    Author: Kihwal Lee, 2015-01-30, 15:26
[HDFS-7373] Clean up temporary files after fsimage transfer failures - HDFS - [issue]
...When a fsimage (e.g. checkpoint) transfer fails, a temporary file is left in each storage directory.  If the size of name space is large, these files can take up quite a bit of space....
http://issues.apache.org/jira/browse/HDFS-7373    Author: Kihwal Lee, 2015-01-28, 16:58
[HDFS-7615] Remove longReadLock - HDFS - [issue]
...As discussed in HDFS-7097, longReadLock can be removed for reducing the chance of writer starvation....
http://issues.apache.org/jira/browse/HDFS-7615    Author: Kihwal Lee, 2015-01-16, 15:41
[HDFS-7533] Datanode sometimes does not shutdown on receiving upgrade shutdown command - HDFS - [issue]
...When datanode is told to shutdown via the dfsadmin command during rolling upgrade, it may not shutdown.  This is because not all writers have responder running, but sendOOB() tries anyw...
http://issues.apache.org/jira/browse/HDFS-7533    Author: Kihwal Lee, 2015-01-13, 15:34
[HDFS-7443] Datanode upgrade to BLOCKID_BASED_LAYOUT fails if duplicate block files are present in the same volume - HDFS - [issue]
...When we did an upgrade from 2.5 to 2.6 in a medium size cluster, about 4% of datanodes were not coming up.  They treid data file layout upgrade for BLOCKID_BASED_LAYOUT introduced in HD...
http://issues.apache.org/jira/browse/HDFS-7443    Author: Kihwal Lee, 2014-12-20, 15:27
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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