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[HDFS-3122] Block recovery with closeFile flag true can race with blockReport. Due to this blocks are getting marked as corrupt. - HDFS - [issue]
...Block Report can race with Block Recovery with closeFile flag true. Block report generated just before block recovery at DN side and due to N/W problems, block report got delayed to NN....
http://issues.apache.org/jira/browse/HDFS-3122    Author: Uma Maheswara Rao G, 2014-04-25, 15:32
[HDFS-6246] Remove 'dfs.support.append' flag from trunk code - HDFS - [issue]
...we added "dfs.support.append' flag long ago to control the issues with append feature.  Now in trunk and hadoop-2, by default we enabled and using it for long time.  So, I propose ...
http://issues.apache.org/jira/browse/HDFS-6246    Author: Uma Maheswara Rao G, 2014-04-25, 14:40
[HDFS-2695] ReadLock should be enough for FsNameSystem#renewLease. - HDFS - [issue]
...When checking the issue HDFS-1241, found this point.Since renewLease is not updating any nameSystem related data, can we make this lock to read lock?am i missing some thing here?...
http://issues.apache.org/jira/browse/HDFS-2695    Author: Uma Maheswara Rao G, 2014-02-15, 19:02
[HDFS-5789] Some of snapshot APIs missing checkOperation double check in fsn - HDFS - [issue]
...HDFS-4591 introduced double checked for HA state while taking fsn lock.checkoperation made before actually taking lock and after the lock again.This pattern missed in some of the snapshot AP...
http://issues.apache.org/jira/browse/HDFS-5789    Author: Uma Maheswara Rao G, 2014-01-25, 13:38
Re: NameNode be formated while namenode is running - HDFS - [mail # dev]
...Seems like you are hitting https://issues.apache.org/jira/browse/HDFS-1690 ?   On Wed, Jan 15, 2014 at 6:58 AM, Stanley Shi  wrote:  ...
   Author: Uma Maheswara Rao G, 2014-01-15, 03:47
[HDFS-5724] modifyCacheDirective logging audit log command wrongly as addCacheDirective - HDFS - [issue]
...modifyCacheDirective: if (isAuditEnabled() && isExternalInvocation()) {        logAuditEvent(success, "addCacheDirective", null, null, null);  ...
http://issues.apache.org/jira/browse/HDFS-5724    Author: Uma Maheswara Rao G, 2014-01-08, 14:46
[HDFS-5665] Remove the unnecessary writeLock while initializing CacheManager in FsNameSystem Ctor - HDFS - [issue]
...I just saw the below piece of code in Fsnamesystem ctor. writeLock();      try {        this.cacheManager = new CacheManager(this, conf, blo...
http://issues.apache.org/jira/browse/HDFS-5665    Author: Uma Maheswara Rao G, 2013-12-17, 15:01
[HDFS-5443] Delete 0-sized block when deleting an under-construction file that is included in snapshot - HDFS - [issue]
...Namenode can stuck in safemode on restart if it crashes just after addblock logsync and after taking snapshot for such file. This issue is reported by Prakash and Sathish.On looking into the...
http://issues.apache.org/jira/browse/HDFS-5443    Author: Uma Maheswara Rao G, 2013-12-11, 14:40
[HDFS-5474] Deletesnapshot can make Namenode in safemode on NN restarts. - HDFS - [issue]
...When we deletesnapshot, we are deleting the blocks associated to that snapshot and after that we do logsync to editlog about deleteSnapshot.There can be a chance that blocks removed from blo...
http://issues.apache.org/jira/browse/HDFS-5474    Author: Uma Maheswara Rao G, 2013-12-11, 14:40
[HDFS-4516] Client crash after block allocation and NN switch before lease recovery for the same file can cause readers to fail forever - HDFS - [issue]
...If client crashes just after allocating block( blocks not yet created in DNs) and NN also switched after this, then new Namenode will not know about locs.Further details will be in comment....
http://issues.apache.org/jira/browse/HDFS-4516    Author: Uma Maheswara Rao G, 2013-11-22, 02:23
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