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[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
[HDFS-2815] Namenode is not coming out of safemode when we perform ( NN crash + restart ) .  Also FSCK report shows blocks missed. - HDFS - [issue]
...When tested the HA(internal) with continuous switch with some 5mins gap, found some blocks missed and namenode went into safemode after next switch.   After the analysis, i found t...
http://issues.apache.org/jira/browse/HDFS-2815    Author: Uma Maheswara Rao G, 2013-11-12, 13:14
Re: BKJM - anyone using it? - HDFS - [mail # dev]
...Hi Todd,  Did you see the JIRA HDFS-4265 ? which is under HDFS-3399 Recently Rakesh has updated the patch.  Regards, Uma   On Wed, Nov 6, 2013 at 1:36 AM, Todd Lipcon  wr...
   Author: Uma Maheswara Rao G, 2013-11-06, 04:35
[HDFS-1611] Some logical issues need to address. - HDFS - [issue]
...Title: Some code level logical issues.Description:1. DFSClient:    Consider the below case, if we enable only info, then below log will never be logged. if (ClientDatanod...
http://issues.apache.org/jira/browse/HDFS-1611    Author: Uma Maheswara Rao G, 2013-09-27, 07:18
[HDFS-4482] ReplicationMonitor thread can exit with NPE due to the race between delete and replication of same file. - HDFS - [issue]
...Trace:java.lang.NullPointerException at org.apache.hadoop.hdfs.server.namenode.FSDirectory.getFullPathName(FSDirectory.java:1442) at org.apache.hadoop.hdfs.server.namenode.INode.getFullPathN...
http://issues.apache.org/jira/browse/HDFS-4482    Author: Uma Maheswara Rao G, 2013-08-30, 12:33
RE: mvn eclipse:eclipse failure on windows - HDFS - [mail # dev]
...Hi Chris,  mvn test works fine for me via commandline. But I am trying with eclipse.  Looks like, 2 things missing in eclipse, 1. /hadoop-common/target/bin is not coming in library...
   Author: Uma Maheswara Rao G, 2013-07-18, 04:43
RE: data loss after cluster wide power loss - HDFS - [mail # dev]
...Hi Dave,   Looks like your analysis is correct. I have faced similar issue some time back.  See the discussion link: http://markmail.org/message/ruev3aa4x5zh2l4w#query:+page:1+mid:...
   Author: Uma Maheswara Rao G, 2013-07-02, 07:31
[HDFS-4525] Provide an API for knowing that whether file is closed or not. - HDFS - [issue]
...Currently recoverLease API will return true if file is already closed. Otherwise it will trigger internalLease recovery and return false. It may take some time to really complete this recove...
http://issues.apache.org/jira/browse/HDFS-4525    Author: Uma Maheswara Rao G, 2013-05-31, 22:56
[HDFS-1944]  Reading of the previously synced data will fail if the last block got corrupted. - HDFS - [issue]
...For example a file can comprise 5 blcoks . In that we have written 4.5 blocks and invoked sync.    Reading of this 4.5 blocks will be successful at this point of time.   ...
http://issues.apache.org/jira/browse/HDFS-1944    Author: Uma Maheswara Rao G, 2013-05-09, 00:44
[HDFS-3091] Update the usage limitations of ReplaceDatanodeOnFailure policy in the config description for the smaller clusters. - HDFS - [issue]
...When verifying the HDFS-1606 feature, Observed couple of issues.Presently the ReplaceDatanodeOnFailure policy satisfies even though we dont have enough DN to replcae in cluster and will be r...
http://issues.apache.org/jira/browse/HDFS-3091    Author: Uma Maheswara Rao G, 2013-03-15, 02:28
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