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[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, 2014-12-19, 04:42
[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, 2014-12-19, 03:44
[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, 2014-12-16, 18:42
[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-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, 2014-11-20, 21:53
[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
[HDFS-7394] Log at INFO level, not WARN level, when InvalidToken is seen in ShortCircuitCache - HDFS - [issue]
...For long running clients, getting an InvalidToken exception is expected and the client refetches a block token when it happens.  The related events are logged at INFO except the ones in...
http://issues.apache.org/jira/browse/HDFS-7394    Author: Kihwal Lee, 2014-11-17, 15:25
[HDFS-7304] TestFileCreation#testOverwriteOpenForWrite hangs - HDFS - [issue]
...The test case times out. It has been observed in multiple pre-commit builds....
http://issues.apache.org/jira/browse/HDFS-7304    Author: Kihwal Lee, 2014-11-12, 05:23
[HDFS-7217] Better batching of IBRs - HDFS - [issue]
...After HDFS-2691 (pipeline recovery in HA), the number of IBR(incremental block report)s have doubled.  Since processing of IBR requires exclusive FSNamesystem write lock, this can be a ...
http://issues.apache.org/jira/browse/HDFS-7217    Author: Kihwal Lee, 2014-11-07, 07:20
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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