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[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-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
[HDFS-6329] WebHdfs does not work if HA is enabled on NN but logical URI is not configured. - HDFS - [issue]
...After HDFS-6100, namenode unconditionally puts the logical name (name service id) as the token service when redirecting webhdfs requests to datanodes, if it detects HA.For HA configurations ...
http://issues.apache.org/jira/browse/HDFS-6329    Author: Kihwal Lee, 2014-06-30, 09:18
[HDFS-6215] Wrong error message for upgrade - HDFS - [issue]
...UPGRADE is printed instead of -upgrade.File system image contains an old layout version -51.An upgrade to version -56 is required.Please restart NameNode with the "-rollingUpgrade started" o...
http://issues.apache.org/jira/browse/HDFS-6215    Author: Kihwal Lee, 2014-06-30, 09:18
[HDFS-6601] Issues in finalizing rolling upgrade when there is a layout version change - HDFS - [issue]
...After HDFS-6545, we have noticed a couple of issues. The storage dir's VERSION file is not properly updated. This becomes a problem when there is a layout version change.  We can have t...
http://issues.apache.org/jira/browse/HDFS-6601    Author: Kihwal Lee, 2014-06-29, 16:19
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