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[HADOOP-1113] namenode slowdown when orphan block(s) left in neededReplication - Hadoop - [issue]
...There were about 200 files that had some under-replicated blocks. A "dfs -setrep 4" followed by a "dfs -setrep 3" was done on these files. Most of the replications took place but the namenod...
http://issues.apache.org/jira/browse/HADOOP-1113    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1122] Divide-by-zero exception in chooseTarget - Hadoop - [issue]
...2007-03-15 20:18:02,542 INFO org.apache.hadoop.ipc.Server: IPC Server handler 6 on 8020 call error: java.io.IOException: java.lang.ArithmeticException: / by zerojava.io.IOException: java.lan...
http://issues.apache.org/jira/browse/HADOOP-1122    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1241] Null PointerException in processReport when namenode is restarted - Hadoop - [issue]
...INFO org.apache.hadoop.ipc.Server: IPC Server handler 0 on 8020 call error: java.io.IOException: java.lang.NullPointerExceptionjava.io.IOException: java.lang.NullPointerException  ...
http://issues.apache.org/jira/browse/HADOOP-1241    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1086] spurious data corruption detected because bad crc file - Hadoop - [issue]
...A bunch of files were  moved from one directory to another but their crc files did not get moved appropriately. Following this move, an application  tries to access these files but...
http://issues.apache.org/jira/browse/HADOOP-1086    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1039] Reduce the time taken by TestCheckpoint - Hadoop - [issue]
...TestCheckpoint starts and kills MiniDFSCluster about 7 times. Each restart of the MiniDFScluster incurs about 15 seconds of wait time. This increases the total time needed to run TestCheckpo...
http://issues.apache.org/jira/browse/HADOOP-1039    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-1009] Infinite loop in chooseTarget - Hadoop - [issue]
...I am seeing the namenode hangs with 99% CPU usage. The stack trace invariably shows the following stack trace. java.util.Random.next(int) @bci=35, line=141 (Compiled frame; information may b...
http://issues.apache.org/jira/browse/HADOOP-1009    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-922] Optimize small reads and seeks - Hadoop - [issue]
...A seek on a DFSInputStream causes causes the next read to re-open the socket connection to the datanode and fetch the remainder of the block all over again. This is not optimal.A small read ...
http://issues.apache.org/jira/browse/HADOOP-922    Author: dhruba borthakur, 2009-07-08, 16:42
[HADOOP-947] isReplicationInProgress() is very heavyweight - Hadoop - [issue]
...Suppose a decommission is in progress. The namenode receives a heartbeat from the being-decommissioned node and then invokes isReplicationInProgress() to determine if the decommissioned is c...
http://issues.apache.org/jira/browse/HADOOP-947    Author: dhruba borthakur, 2009-07-08, 16:42
[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
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