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RE: removing datanodes from clustes. - HDFS - [mail # user]
...Hi Yogesh..  FYI. Please go through following..  http://tech.zhenhua.info/2011/04/how-to-decommission-nodesblacklist.html   http://hadoop-karma.blogspot.in/2011/01/hadoop-cook...
   Author: Brahma Reddy Battula, 2012-09-12, 04:46
[HDFS-3600] DataNode is not responding After throwing java.lang.OutOfMemoryError: Direct buffer memory - HDFS - [issue]
...Scenario:=========Started NN with four DN'swritten client program such that it will keep on write,append and read dta with 10 thread.After 4 hours ,got OOME.Then DN listed under Dead it's no...
http://issues.apache.org/jira/browse/HDFS-3600    Author: Brahma Reddy Battula, 2012-08-28, 03:40
[HDFS-3586] Blocks are not getting replicate even DN's are availble. - HDFS - [issue]
...Scenario:=========Started four DN's(Say DN1,DN2,DN3 and DN4)writing files with RF=3..formed pipeline with DN1->DN2->DN3.Since DN3 network is very slow.it's not able to send acks.Again ...
http://issues.apache.org/jira/browse/HDFS-3586    Author: Brahma Reddy Battula, 2012-08-14, 13:12
overreplicated blocks are not getting removed - HDFS - [mail # user]
...Hi All,  I ended up with over-replicated blocks which are not getting deleted..  I did like following..  Started hadoop cluster with three DN's  Written 1k files with RF ...
   Author: Brahma Reddy Battula, 2012-08-07, 15:23
Reg:upgrade from 20.205 to hadoop2 - HDFS - [mail # user]
...Hi All,  I had cluster running with 20.205 version with 1GB data. Then I upgraded to  hadoop2(Upgrade was successful).After up-gradation I am not able to read 1 00 blocks..Then I g...
   Author: Brahma Reddy Battula, 2012-07-26, 14:51
[HDFS-3526] Standy NameNode is entering into Safemode even after HDFS-2914 due to resources low - HDFS - [issue]
...Scenario:=========Start ANN SNN with One DNMake 100% disk full for SNNNow restart SNN..Here SNN is going safemode..But it shouldnot happen according to HDFS-2914...
http://issues.apache.org/jira/browse/HDFS-3526    Author: Brahma Reddy Battula, 2012-07-26, 06:41
[expand - 1 more] - RE: Starting NameNode with finalize option - HDFS - [mail # user]
...Hi  I got cause...   I ran like following  ./hadoop daemon.sh start namenode -finalize so logs are redirected to out f ile and i was not able give input(i.e Y or N). That's wh...
   Author: Brahma Reddy Battula, 2012-07-24, 15:02
[HDFS-3605] Block mistakenly marked corrupt during edit log catchup phase of failover - HDFS - [issue]
...Open file for appendWrite data and sync.After next log roll and editlog tailing in standbyNN close the append stream.Call append multiple times on the same file, before next editlog roll.Now...
http://issues.apache.org/jira/browse/HDFS-3605    Author: Brahma Reddy Battula, 2012-07-19, 14:02
[expand - 2 more] - RE: Multiple SLF4J bindings - HDFS - [mail # user]
...HI Mohammad Tariq,    Yes..you are correct.. (i.e Proper configuration and dns  resolution is very important in order to get hbase working)     _____________________...
   Author: Brahma Reddy Battula, 2012-07-12, 13:16
[HDFS-3584] Blocks are getting marked as corrupt with append operation under high load. - HDFS - [issue]
...Scenario:========= 1. There are 2 clients cli1 and cli2 cli1 write a file F1 and not closed2. The cli2 will call append on unclosed file and triggers a leaserecovery3. Cli1 is closed4. Lease...
http://issues.apache.org/jira/browse/HDFS-3584    Author: Brahma Reddy Battula, 2012-07-11, 18:12
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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