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[HDFS-4526] If persistBlocks enabled in Namenode, hflush call can avoid persisting blocks with fsync - HDFS - [issue]
...If persists blocks enabled/in HA, evenry getAdditionalBlock will persist the blocks.So, if user calls Hflush, then client can simply ensure data flushed to DNs and need not worry about fsync...
http://issues.apache.org/jira/browse/HDFS-4526    Author: Uma Maheswara Rao G, 2013-03-05, 08:54
RE: [Vote] Merge branch-trunk-win to trunk - HDFS - [mail # dev]
...+1 (non-binding)   Thanks a lot for the work done by Suresh and team of community! I don't think there will be much problems because of platform dependancy as our development is with Ja...
   Author: Uma Maheswara Rao G, 2013-03-01, 05:20
[HDFS-3222] DFSInputStream#openInfo should not silently get the length as 0 when locations length is zero for last partial block. - HDFS - [issue]
...I have seen one situation with Hbase cluster.Scenario is as follows:1)1.5 blocks has been written and synced.2)Suddenly cluster has been restarted.Reader opened the file and trying to get th...
http://issues.apache.org/jira/browse/HDFS-3222    Author: Uma Maheswara Rao G, 2013-02-20, 07:27
[HDFS-3791] Backport HDFS-173 to Branch-1 :  Recursively deleting a directory with millions of files makes NameNode unresponsive for other commands until the deletion completes - HDFS - [issue]
...Backport HDFS-173. see the comment for more details...
http://issues.apache.org/jira/browse/HDFS-3791    Author: Uma Maheswara Rao G, 2012-12-03, 07:33
[HDFS-3399] BookKeeper option support for NN HA - HDFS - [issue]
...Here is the JIRA to BookKeeper support issues with NN HA. We can file all the BookKeeperJournalManager issues under this JIRA for more easy tracking....
http://issues.apache.org/jira/browse/HDFS-3399    Author: Uma Maheswara Rao G, 2012-11-21, 11:42
[HDFS-4190] Read complete block into memory once in BlockScanning and reduce concurrent disk access - HDFS - [issue]
...When we perform bulk write operations to DFS we observed that block scan is one bottleneck for concurrent disk access.To see real load on disks, keep single data node and local client flushi...
http://issues.apache.org/jira/browse/HDFS-4190    Author: Uma Maheswara Rao G, 2012-11-19, 12:06
[HDFS-3623] BKJM: zkLatchWaitTimeout hard coded to 6000. Make use of ZKSessionTimeout instead. - HDFS - [issue]
...if (!zkConnectLatch.await(6000, TimeUnit.MILLISECONDS)) {we can make use of session timeout instead of hardcoding this value....
http://issues.apache.org/jira/browse/HDFS-3623    Author: Uma Maheswara Rao G, 2012-11-16, 13:21
[HDFS-3616] TestWebHdfsWithMultipleNameNodes fails with ConcurrentModificationException in DN shutdown - HDFS - [issue]
...I have seen this in precommit build #2743java.util.ConcurrentModificationException at java.util.HashMap$HashIterator.nextEntry(HashMap.java:793) at java.util.HashMap$EntryIterator.next(HashM...
http://issues.apache.org/jira/browse/HDFS-3616    Author: Uma Maheswara Rao G, 2012-10-27, 15:00
RE: The lease hard limit is 1 hour and in another client want to append to a file need to wait for 1 hour? - HDFS - [mail # dev]
...Hi,   I am assuming that your actual client crashed. and another Client wants to  append to same file which not closed by previous client.  Generally we will append to the fil...
   Author: Uma Maheswara Rao G, 2012-10-18, 09:17
RE: [DISCUSS] Increasing the default block size - HDFS - [mail # dev]
...+1 for increasing it to higher value by defaut (128/256MB)  Most of the deployment which I worked are configured with 256MB and workin g well. ________________________________________ F...
   Author: Uma Maheswara Rao G, 2012-10-16, 06:23
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