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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-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, 2014-09-04, 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-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, 2014-09-04, 00:19
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