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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
[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
[HDFS-2494] [webhdfs] When Getting the file using OP=OPEN with DN http address, ESTABLISHED sockets are growing. - HDFS - [issue]
...As part of the reliable test,Scenario:Initially check the socket count. ---there are aroud 42 sockets are there.open the file with DataNode http address using op=OPEN request parameter about...
http://issues.apache.org/jira/browse/HDFS-2494    Author: Uma Maheswara Rao G, 2012-09-12, 03:04
[HDFS-3287] 'hdfs -format' should be able to initialize non-file journal managers. - HDFS - [issue]
...This is the JIRA to support the formatting of shared dirs.for more details see HDFS-3275....
http://issues.apache.org/jira/browse/HDFS-3287    Author: Uma Maheswara Rao G, 2012-08-01, 14:07
[HDFS-2827] Cannot save namespace after renaming a directory above a file with an open lease - HDFS - [issue]
...When i execute the following operations and wait for checkpoint to complete.fs.mkdirs(new Path("/test1"));FSDataOutputStream create = fs.create(new Path("/test/abc.txt")); //dont closefs.ren...
http://issues.apache.org/jira/browse/HDFS-2827    Author: Uma Maheswara Rao G, 2012-07-10, 19:13
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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