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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
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
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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