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[HDFS-4605] Implement block-size independent file checksum - HDFS - [issue]
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...The value of current getFileChecksum() is block-size dependent. Since FileChecksum is mainly intended for comparing content of files, removing this dependency will make FileCheckum in HDFS r...
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http://issues.apache.org/jira/browse/HDFS-4605
Author: Kihwal Lee,
2013-03-19, 04:14
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[HDFS-4186] logSync() is called with the write lock held while releasing lease - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-4186
Author: Kihwal Lee,
2013-03-11, 20:44
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[HDFS-4495] Allow client-side lease renewal to be retried beyond soft-limit - HDFS - [issue]
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...The current lease renewal code in DFSClient gives up after several retries, if the soft limit exceeds. This causes the client to abort. Without this self destruction behavior, lease re...
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http://issues.apache.org/jira/browse/HDFS-4495
Author: Kihwal Lee,
2013-02-14, 14:05
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[HDFS-4080] Add a separate logger for block state change logs to enable turning off those logs - HDFS - [issue]
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...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 ...
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http://issues.apache.org/jira/browse/HDFS-4080
Author: Kihwal Lee,
2013-02-06, 17:05
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[HDFS-4075] Reduce recommissioning overhead - HDFS - [issue]
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...When datanodes are recommissioned, {BlockManager#processOverReplicatedBlocksOnReCommission()} is called for each rejoined node and excess blocks are added to the invalidate list. The pr...
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http://issues.apache.org/jira/browse/HDFS-4075
Author: Kihwal Lee,
2013-02-06, 17:05
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[HDFS-4181] LeaseManager tries to double remove and prints extra messages - HDFS - [issue]
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...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...
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http://issues.apache.org/jira/browse/HDFS-4181
Author: Kihwal Lee,
2013-02-06, 17:05
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[HDFS-4090] getFileChecksum() result incompatible when called against zero-byte files. - HDFS - [issue]
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...When getFileChecksum() is called against a zero-byte file, the branch-1 client returns MD5MD5CRC32FileChecksum with crcPerBlock=0, bytePerCrc=0 and md5=70bc8f4b72a86921468bf8e8441dce51, wher...
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http://issues.apache.org/jira/browse/HDFS-4090
Author: Kihwal Lee,
2013-02-06, 17:05
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[HDFS-4191] Track new transactions per thread so that unnecessary logSync() calls can be avoided - HDFS - [issue]
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...With this fix, logSync() can be called anytime by a thread without affecting the batched syncs metrics. As discussed in HDFS-4186, we will put this feature only to trunk first and let it soa...
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http://issues.apache.org/jira/browse/HDFS-4191
Author: Kihwal Lee,
2012-12-12, 00:54
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[HDFS-4254] testAllEditsDirsFailOnFlush makes subsequent test cases fail (0.23.6 only) - HDFS - [issue]
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...This jira is about a broken test case in branch-0.23 only.After HDFS-4233, testAllEditsDirsFailOnFlush started making subsequent cases in the same file fail. This is because MiniDFSCluster w...
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http://issues.apache.org/jira/browse/HDFS-4254
Author: Kihwal Lee,
2012-12-01, 12:42
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[HDFS-4233] NN keeps serving even after no journals started while rolling edit - HDFS - [issue]
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...We've seen namenode keeps serving even after rollEditLog() failure. Instead of taking a corrective action or regard this condition as FATAL, it keeps on serving and modifying its file system...
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http://issues.apache.org/jira/browse/HDFS-4233
Author: Kihwal Lee,
2012-12-01, 00:14
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