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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
[HDFS-2434] TestNameNodeMetrics.testCorruptBlock fails intermittently - HDFS - [issue]
...java.lang.AssertionError: Bad value for metric CorruptBlocks expected:<1> but was:<0> at org.junit.Assert.fail(Assert.java:91) at org.junit.Assert.failNotEquals(Assert.java:645) ...
http://issues.apache.org/jira/browse/HDFS-2434    Author: Uma Maheswara Rao G, 2013-03-07, 12:42
[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
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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