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[HADOOP-1178] NullPointer Exception in org.apache.hadoop.dfs.NameNode.isDir on namenode restart - Hadoop - [issue]
...On a namenode restart, I sometimes get the following exception. The problem is that the RPC server is initialized before the namenode data structures are initialized. This means that an RPC ...
http://issues.apache.org/jira/browse/HADOOP-1178    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1187] DFS Scalability: avoid scanning entire list of datanodes in getAdditionalBlocks - Hadoop - [issue]
...A new block allocations for a file scans the list of all known datanodes to find if the client that is a also a cluster node. If so, then it tries to allocate a replica locally. This check c...
http://issues.apache.org/jira/browse/HADOOP-1187    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1139] All block trasitions should be logged at log level INFO - Hadoop - [issue]
...The namenode records block trasitions in its log file. It is seen that some of the block transition messages were being logged at debug level. These should be done at INFO level....
http://issues.apache.org/jira/browse/HADOOP-1139    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1180] NNbench test should be able to test the checksumfilesystem as well as the raw filesystem - Hadoop - [issue]
...The NNbench test should have the option of testing a file system with checksums turned on and with checksums turned off. The original behaviour of nnbench test was to test hdfs without check...
http://issues.apache.org/jira/browse/HADOOP-1180    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1184] Decommission fails if a block that needs replication has only one replica - Hadoop - [issue]
...If the only replica of a block resides on a node being decommissioned, then the decommission command does not complete. The blocks do not get added to neededReplication because neededReplica...
http://issues.apache.org/jira/browse/HADOOP-1184    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1133] Tools to analyze and debug namenode on a production cluster - Hadoop - [issue]
...I would like to have a tool that dumps namenode data structures to a log file. This is especially useful in debugging a production cluster where attaching a debugger to the namenode is not a...
http://issues.apache.org/jira/browse/HADOOP-1133    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1135] A block report processing may incorrectly cause the namenode to delete blocks - Hadoop - [issue]
...When a block report arrives at the namenode, the namenode goes through all the blocks on that datanode. If a block is not valid it is marked for deletion. The blocks-to-be-deleted are sent t...
http://issues.apache.org/jira/browse/HADOOP-1135    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1138] Datanodes that are dead for a long long time should not show up in the UI - Hadoop - [issue]
...Proposal 1:If a include files is used, then show all nodes (dead/alive) that are listed in the includes file. If there isn't an include file, then display only nodes that have pinged this in...
http://issues.apache.org/jira/browse/HADOOP-1138    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1149] DFS Scalability: high cpu usage in addStoredBlock - Hadoop - [issue]
...I have seen addStoredBlock() consume lots of CPU. One possible cause is that it invokes proccessOverReplicatedBlock. The logic to find and purge over-replicated blocks can be done much less ...
http://issues.apache.org/jira/browse/HADOOP-1149    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1108] Checksumed file system should  retry reading if a different replica is found when handle ChecksumException - Hadoop - [issue]
...Currently there is bug in the code where a checksumed file system throws an exception if a different replica is found but retry otherwise when handle ChecksumException....
http://issues.apache.org/jira/browse/HADOOP-1108    Author: dhruba borthakur, 2009-07-08, 16:42
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