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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-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-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-5583] Make DN send an OOB Ack on shutdown before restarting - HDFS - [issue]
...Add an ability for data nodes to send an OOB response in order to indicate an upcoming upgrade-restart. Client should ignore the pipeline error from the node for a configured amount of time ...
http://issues.apache.org/jira/browse/HDFS-5583    Author: Kihwal Lee, 2014-06-27, 23:38
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NEW: Monitor These Apps!
elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB