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[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
[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
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