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[HADOOP-959] TestCheckpoint fails on Windows - Hadoop - [issue]
...The new unit test that tests periodic checkpointing fails on Windows. The problem is that the method FSEditLog.purgeEditLog() uses renameTo() to atomically move edits.new to editsFile.rename...
http://issues.apache.org/jira/browse/HADOOP-959    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-885] Reduce CPU usage on namenode: gettimeofday - Hadoop - [issue]
...On a 900 node idle cluster, the namenode spends about  20% of CPU. Most of this CPU is spent processing pure heartbeats. No jobs are running on this cluster and all nodes are alive and ...
http://issues.apache.org/jira/browse/HADOOP-885    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-807] splitting DFS version number - Hadoop - [issue]
...In the current code, there is a enum named DFS_CURRENT_VERSION. It is being used for three different purposes:1. It is stored in the fsimage and represents the format of the fsimage.2. It is...
http://issues.apache.org/jira/browse/HADOOP-807    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-829] Separate the datanode contents that is written to the fsimage vs the contents used in over-the-wire communication - Hadoop - [issue]
...In the existing implementation, the Namenode has a data structure called DatanodeDescriptor. It is used to serialize contents of the Datanode while writing it to the fsimage. The same serial...
http://issues.apache.org/jira/browse/HADOOP-829    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1073] DFS Scalability: high CPU usage in choosing replication targets and file open - Hadoop - [issue]
...I have a test cluster that has about 1600 data nodes. randomWriter fails to run because of map tasks fail with "connection timeout" message. The namenode quickly gets to 100% CPU usage. The ...
http://issues.apache.org/jira/browse/HADOOP-1073    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-812] Make DfsPath a public class - Hadoop - [issue]
...I would like to get the filesize of a particular HDFS file from an external program. This functionality is exported through the DfsPath class. I would like to make this class a public class....
http://issues.apache.org/jira/browse/HADOOP-812    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-814] Increase dfs scalability by optimizing locking on namenode. - Hadoop - [issue]
...The current dfs namenode encounters locking bottlenecks when the number of datanodes is large. The namenode uses a single global lock to protect access to data structures. One key area is he...
http://issues.apache.org/jira/browse/HADOOP-814    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-764] The memory consumption of processReport() in the namenode can be reduced - Hadoop - [issue]
...The FSNamesystem.processReport() method converts the blocklist for a datanode into an array by calling node.getBlocks(). Although this memory allocation is transient, it could possibly requi...
http://issues.apache.org/jira/browse/HADOOP-764    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-752] Possible locking issues in HDFS Namenode - Hadoop - [issue]
...I have been investigating the cause of random Namenode memory corruptions/memory overflows, etc. Please comment. 1. The functions datanodeReport() and DFSNodesStatus() do not acquire th...
http://issues.apache.org/jira/browse/HADOOP-752    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-665]  hadoop -rmr  does NOT process multiple arguments and does not complain - Hadoop - [issue]
...hadoop dfs -rmr /user/arkady/fuchun /user/arkady/fuchun_h /user/arkady/log /user/arkady/t /user/arkady/t106/10/31 20:15:31 INFO conf.Configuration: parsing jar:file:/nfs/ystools/vol/ystools/...
http://issues.apache.org/jira/browse/HADOOP-665    Author: dhruba borthakur, 2009-07-08, 16:42
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