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[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
[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
[HDFS-4807] DFSOutputStream.createSocketForPipeline() should not include timeout extension on connect - HDFS - [issue]
...In createSocketForPipeline(), connect() is called with a timeout set to (socket_timeout + read_extension * num_datanodes). Since it is simply connecting to a single node, it does not make se...
http://issues.apache.org/jira/browse/HDFS-4807    Author: Kihwal Lee, 2014-09-04, 00:00
[HDFS-4998] TestUnderReplicatedBlocks fails intermittently - HDFS - [issue]
...Looking at branch-2.1-beta jenkins build, this test case seems flaky.First, addToInvalidates() is called against a block on a datanode. This removes the dn from the BlockInfo in blocksMap. A...
http://issues.apache.org/jira/browse/HDFS-4998    Author: Kihwal Lee, 2014-09-03, 23:53
[HDFS-6601] Issues in finalizing rolling upgrade when there is a layout version change - HDFS - [issue]
...After HDFS-6545, we have noticed a couple of issues. The storage dir's VERSION file is not properly updated. This becomes a problem when there is a layout version change.  We can have t...
http://issues.apache.org/jira/browse/HDFS-6601    Author: Kihwal Lee, 2014-09-03, 21:34
[HDFS-6293] Issues with OIV processing PB-based fsimages - HDFS - [issue]
...There are issues with OIV when processing fsimages in protobuf. Due to the internal layout changes introduced by the protobuf-based fsimage, OIV consumes excessive amount of memory.  We...
http://issues.apache.org/jira/browse/HDFS-6293    Author: Kihwal Lee, 2014-09-03, 21:34
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