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[HDFS-6696] Name node cannot start if the path of a file under construction contains ".snapshot" - HDFS - [issue]
...Using -renameReserved to rename ".snapshot" in a pre-hdfs-snapshot feature fsimage during upgrade only works, if there is nothing under construction under the renamed directory.  I am n...
http://issues.apache.org/jira/browse/HDFS-6696    Author: Kihwal Lee, 2014-07-25, 00:45
[HDFS-6599] 2.4 addBlock is 10 to 20 times slower compared to 0.23 - HDFS - [issue]
...From one of our busiest 0.23 clusters:"AddBlockAvgTime" : 0.9514711501719515"CreateAvgTime" : 1.7564162389174"CompleteAvgTime" : 1.3310406035056548"BlockReceivedAndDeletedAvgTime" : 0.661210...
http://issues.apache.org/jira/browse/HDFS-6599    Author: Kihwal Lee, 2014-07-21, 06:42
[HDFS-5522] Datanode disk error check may be incorrectly skipped - HDFS - [issue]
...After HDFS-4581 and HDFS-4699, checkDiskError() is not called when network errors occur during processing data node requests.  This appears to create problems when a disk is having prob...
http://issues.apache.org/jira/browse/HDFS-5522    Author: Kihwal Lee, 2014-07-16, 08:56
[HDFS-6651] Deletion failure can leak inodes permanently. - HDFS - [issue]
...As discussed in HDFS-6618, if a deletion of tree fails in the middle, any collected inodes and blocks will not be removed from INodeMap and BlocksMap. Since fsimage is saved by iterating ove...
http://issues.apache.org/jira/browse/HDFS-6651    Author: Kihwal Lee, 2014-07-11, 02:23
[HDFS-6663] Admin command to track file and locations from block id - HDFS - [issue]
...A dfsadmin command that allows finding out the file and the locations given a block number will be very useful in debugging production issues.   It may be possible to add this feature t...
http://issues.apache.org/jira/browse/HDFS-6663    Author: Kihwal Lee, 2014-07-10, 19:11
[HDFS-6618] FSNamesystem#delete drops the FSN lock between removing INodes from the tree and deleting them from the inode map - HDFS - [issue]
...After HDFS-6527, we have not seen the edit log corruption for weeks on multiple clusters until yesterday. Previously, we would see it within 30 minutes on a cluster.But the same condition wa...
http://issues.apache.org/jira/browse/HDFS-6618    Author: Kihwal Lee, 2014-07-10, 15:55
[HDFS-6622] Rename and AddBlock may race and produce invalid edits - HDFS - [issue]
...While investigating HDFS-6618, we have discovered that rename happening in the middle of getAdditionalBlock() can lead to logging of invalid edit entry.In  getAdditionalBlock() , the pa...
http://issues.apache.org/jira/browse/HDFS-6622    Author: Kihwal Lee, 2014-07-10, 15:55
Re: Jenkins build fails - HDFS - [mail # dev]
...Now builds are failing because of this. Please make sure build works with"-Pnative".[exec] CMake Error at/usr/share/cmake-2.8/Modules/FindPackageHandleStandardArgs.cmake:108(message): &...
   Author: Kihwal Lee, 2014-07-09, 17:58
[HDFS-6088] Add configurable maximum block count for datanode - HDFS - [issue]
...Currently datanode resources are protected by the free space check and the balancer.  But datanodes can run out of memory simply storing too many blocks. If the sizes of blocks are smal...
http://issues.apache.org/jira/browse/HDFS-6088    Author: Kihwal Lee, 2014-07-03, 06:28
[HDFS-6527] Edit log corruption due to defered INode removal - HDFS - [issue]
...We have seen a SBN crashing with the following error:[Edit log tailer] ERROR namenode.FSEditLogLoader:Encountered exception on operation AddBlockOp[path=/xxx,penultimateBlock=NULL, lastBlock...
http://issues.apache.org/jira/browse/HDFS-6527    Author: Kihwal Lee, 2014-06-30, 23:34
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