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[HADOOP-6149] FileStatus can support a fileid per path - Hadoop - [issue]
...FileStatus should expose a id that uniquely identifies a file. This helps in developing applications that work correctly even when files are moved from one directory to another....
http://issues.apache.org/jira/browse/HADOOP-6149    Author: dhruba borthakur, 2013-04-19, 23:31
[HADOOP-923] DFS Scalability: datanode heartbeat timeouts cause cascading timeouts of other datanodes - Hadoop - [issue]
...The datanode sends a heartbeat to the namenode every 3 seconds. The namenode processes the heartbeat and sends  a list of block-to-be-replicated and blocks-to-be-deleted as part of the ...
http://issues.apache.org/jira/browse/HADOOP-923    Author: dhruba borthakur, 2012-09-18, 18:18
[HADOOP-7460] Support for pluggable Trash policies - Hadoop - [issue]
...It would be beneficial to make the Trash policy pluggable. One primary use-case for this is to archive files (in some remote store) when they get removed by Trash emptier....
http://issues.apache.org/jira/browse/HADOOP-7460    Author: dhruba borthakur, 2012-07-15, 22:18
[HADOOP-2330] Preallocate transaction log to improve namenode transaction logging performance - Hadoop - [issue]
...In the current implementation, the transaction log is opened in "append" mode and every new transaction is written to the end of the log. This means that new blocks get allocated to the edit...
http://issues.apache.org/jira/browse/HADOOP-2330    Author: dhruba borthakur, 2012-06-15, 22:50
[HADOOP-970] Reduce CPU usage of hadoop ipc package - Hadoop - [issue]
...There are a couple of optimizations that could be done to reduce CPU consumption.1. The method Server.cleanupConnections() could be invoked less often.2. The method Server.cleanupConnections...
http://issues.apache.org/jira/browse/HADOOP-970    Author: dhruba borthakur, 2011-07-16, 18:26
[HADOOP-1117] DFS Scalability: When the namenode is restarted it consumes 80% CPU - Hadoop - [issue]
...When the namenode is restarted, the datanodes register and each block is inserted into neededReplication. When the namenode exists, safemode it sees starts processing neededReplication. It p...
http://issues.apache.org/jira/browse/HADOOP-1117    Author: dhruba borthakur, 2011-05-16, 21:32
[HADOOP-1126] Optimize CPU usage when cluster restarts - Hadoop - [issue]
...When the namenode restarts, all datanodes report their blocks to the namenode. The namenode inserts these blocks into neededReplication(). When safemode exists, pendingTransfers removes them...
http://issues.apache.org/jira/browse/HADOOP-1126    Author: dhruba borthakur, 2010-02-02, 06:16
[HADOOP-994] DFS Scalability : a BlockReport that returns large number of blocks-to-be-deleted cause datanode to lost connectivity to namenode - Hadoop - [issue]
...The Datanode periodically invokes a block report RPC to the Namenode. This RPC returns the number of blocks that are to be invalidated by the Datanode. The Datanode then starts to delete all...
http://issues.apache.org/jira/browse/HADOOP-994    Author: dhruba borthakur, 2009-10-27, 01:27
[HADOOP-774] Datanodes fails to heartbeat when a directory with a large number of blocks is deleted - Hadoop - [issue]
...If a user removes a few files that are huge, it causes the namenode to send BlockInvalidate command to the relevant Datanodes. The Datanode process the blockInvalidate command as part of its...
http://issues.apache.org/jira/browse/HADOOP-774    Author: dhruba borthakur, 2009-10-27, 01:27
[HADOOP-645] Map-reduce task does not finish correctly when -reducer NONE is specified - Hadoop - [issue]
...Map-reduce task does not finish correctly when -reducer NONE is specified, The NONE option means that the reducer should not be generating any output. Using this option causes an exception i...
http://issues.apache.org/jira/browse/HADOOP-645    Author: dhruba borthakur, 2009-07-08, 17:05
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