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[HDFS-5796] The file system browser in the namenode UI requires SPNEGO. - HDFS - [issue]
...After HDFS-5382, the browser makes webhdfs REST calls directly, requiring SPNEGO to work between user's browser and namenode.  This won't work if the cluster's security infrastructure i...
http://issues.apache.org/jira/browse/HDFS-5796    Author: Kihwal Lee, 2015-01-25, 11:16
[HDFS-7587] Edit log corruption can happen if append fails with a quota violation - HDFS - [issue]
...We have seen a standby namenode crashing due to edit log corruption. It was complaining that OP_CLOSE cannot be applied because the file is not under-construction.When a client was trying to...
http://issues.apache.org/jira/browse/HDFS-7587    Author: Kihwal Lee, 2015-01-20, 23:00
[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-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, 2015-01-16, 02:43
[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
[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, 2014-12-20, 15:18
[HDFS-7097] Allow block reports to be processed during checkpointing on standby name node - HDFS - [issue]
...On a reasonably busy HDFS cluster, there are stream of creates, causing data nodes to generate incremental block reports.  When a standby name node is checkpointing, RPC handler threads...
http://issues.apache.org/jira/browse/HDFS-7097    Author: Kihwal Lee, 2014-11-26, 16:56
[HDFS-4080] Add a separate logger for block state change logs to enable turning off those logs - HDFS - [issue]
...Although the block-level logging in namenode is useful for debugging, it can add a significant overhead to busy hdfs clusters since they are done while the namespace write lock is held. One ...
http://issues.apache.org/jira/browse/HDFS-4080    Author: Kihwal Lee, 2014-11-21, 18:55
[HDFS-5558] LeaseManager monitor thread can crash if the last block is complete but another block is not. - HDFS - [issue]
...As mentioned in HDFS-5557, if a file has its last and penultimate block not completed and the file is being closed, the last block may be completed but the penultimate one might not. If this...
http://issues.apache.org/jira/browse/HDFS-5558    Author: Kihwal Lee, 2014-11-19, 23:16
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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