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[HDFS-5438] Flaws in block report processing can cause data loss - HDFS - [issue]
...The incremental block reports from data nodes and block commits are asynchronous. This becomes troublesome when the gen stamp for a block is changed during a write pipeline recovery. If an i...
http://issues.apache.org/jira/browse/HDFS-5438    Author: Kihwal Lee, 2014-09-04, 00:41
[HDFS-5346] Avoid unnecessary call to getNumLiveDataNodes() for each block during IBR processing - HDFS - [issue]
...When initial block reports are being processed, checkMode() is called from incrementSafeBlockCount(). This causes the replication queues to be initialized in the middle of processing a block...
http://issues.apache.org/jira/browse/HDFS-5346    Author: Kihwal Lee, 2014-09-04, 00:41
[HDFS-5557] Write pipeline recovery for the last packet in the block may cause rejection of valid replicas - HDFS - [issue]
...When a block is reported from a data node while the block is under construction (i.e. not committed or completed), BlockManager calls BlockInfoUnderConstruction.addReplicaIfNotPresent() to u...
http://issues.apache.org/jira/browse/HDFS-5557    Author: Kihwal Lee, 2014-09-04, 00:41
[HDFS-5071] Change hdfs-nfs parent project to hadoop-project - HDFS - [issue]
...https://builds.apache.org/job/Hadoop-Hdfs-trunk/HDFS trunk build has been failing for a while due to failures in HDFS-NFS....
http://issues.apache.org/jira/browse/HDFS-5071    Author: Kihwal Lee, 2014-09-04, 00:36
[HDFS-4186] logSync() is called with the write lock held while releasing lease - HDFS - [issue]
...As pointed out in HDFS-4138, when the lease monitor calls internalReleaseLease(), it acquires the namespace write lock. Inside internalReleaseLease(), if a block recovery is needed, the leas...
http://issues.apache.org/jira/browse/HDFS-4186    Author: Kihwal Lee, 2014-09-04, 00:22
[HDFS-4181] LeaseManager tries to double remove and prints extra messages - HDFS - [issue]
...When checkLeases() runs, internalReleaseLease() is called on the expired ones. When it returns true, the lease is already removed, yet it is tried again in checkLease(). This causes unnecess...
http://issues.apache.org/jira/browse/HDFS-4181    Author: Kihwal Lee, 2014-09-04, 00:19
[HDFS-4090] getFileChecksum() result incompatible when called against zero-byte files. - HDFS - [issue]
...When getFileChecksum() is called against a zero-byte file, the branch-1 client returns MD5MD5CRC32FileChecksum with crcPerBlock=0, bytePerCrc=0 and md5=70bc8f4b72a86921468bf8e8441dce51, wher...
http://issues.apache.org/jira/browse/HDFS-4090    Author: Kihwal Lee, 2014-09-04, 00:19
[HDFS-4075] Reduce recommissioning overhead - HDFS - [issue]
...When datanodes are recommissioned, {BlockManager#processOverReplicatedBlocksOnReCommission()} is called for each rejoined node and excess blocks are added to the invalidate list. The pr...
http://issues.apache.org/jira/browse/HDFS-4075    Author: Kihwal Lee, 2014-09-04, 00:19
[HDFS-4477] Secondary namenode may retain old tokens - HDFS - [issue]
...Upon inspection of a fsimage created by a secondary namenode, we've discovered it contains very old tokens. These are probably the ones that were not explicitly canceled.  It may be rel...
http://issues.apache.org/jira/browse/HDFS-4477    Author: Kihwal Lee, 2014-09-04, 00:00
[HDFS-4714] Log short messages in Namenode RPC server for exceptions meant for clients - HDFS - [issue]
...Namenode can slow down significantly if a rogue client/job issues massive number of requests that will fail. E.g. permission denied, quota overage, etc.  The major contributing factor i...
http://issues.apache.org/jira/browse/HDFS-4714    Author: Kihwal Lee, 2014-09-04, 00:00
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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