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[HDFS-3618] SSH fencing option may incorrectly succeed if nc (netcat) command not present - HDFS - [issue]
...Started NN's and zkfc's in Suse11.Suse11 will have netcat installation and netcat -z will work(but nc -z wn't work)..While executing following command, got command not found hence rc will be...
http://issues.apache.org/jira/browse/HDFS-3618    Author: Brahma Reddy Battula, 2013-08-14, 10:19
[HDFS-2906] NullPointerExeception in BlockReceiver on DataNode restart. - HDFS - [issue]
...Scenario:1) Start the cluster with one NN and two DN's.2) Keep restart one DN for every 10mins.3) Let's keep the clients to write the data continuosly.Observed below trace.2012-02-07 01:03:4...
http://issues.apache.org/jira/browse/HDFS-2906    Author: Brahma Reddy Battula, 2013-07-26, 06:15
[HDFS-3436] adding new datanode to existing  pipeline fails in case of Append/Recovery - HDFS - [issue]
...Scenario:=========1. Cluster with 4 DataNodes.2. Written file to 3 DNs, DN1->DN2->DN33. Stopped DN3,Now Append to file is failing due to addDatanode2ExistingPipeline is failed. CL...
http://issues.apache.org/jira/browse/HDFS-3436    Author: Brahma Reddy Battula, 2013-05-07, 13:40
RE: Put a file to Hadoop with WebHDFS ? - HDFS - [mail # user]
... you need to give the datanode http port,Like below   curl -i -X PUT -T /home/levi/3 "http://localhost:50075/webhdfs/v1/levi/3?op=CREATE"   Syntax for writing file using webhd...
   Author: Brahma Reddy Battula, 2013-03-20, 04:00
[HDFS-3384] DataStreamer thread should be closed immediatly when failed to setup a PipelineForAppendOrRecovery - HDFS - [issue]
...Scenraio:=========write a filecorrupt block manuallycall append..2012-04-19 09:33:10,776 INFO  hdfs.DFSClient (DFSOutputStream.java:createBlockOutputStream(1059)) - Exception in createB...
http://issues.apache.org/jira/browse/HDFS-3384    Author: Brahma Reddy Battula, 2013-03-13, 05:07
RE: How to get Under-replicated blocks information [Location] - HDFS - [mail # user]
...you get the block locations(hoping that you are asking about which node) by two ways..  i) ./hadoop fsck / -files -blocks -locations.(Commandline) ii) NameNode UI..(GO to UI and click o...
   Author: Brahma Reddy Battula, 2013-02-27, 10:33
[HDFS-3980] NPE in HttpURLConnection.java while starting SecondaryNameNode. - HDFS - [issue]
...Scenario:========I started secure cluster by going thru following..https://ccp.cloudera.com/display/CDHDOC/CDH3+Security+Guide..Here SecondaryNamenode is getting shutdown by throwing NPE..Pl...
http://issues.apache.org/jira/browse/HDFS-3980    Author: Brahma Reddy Battula, 2012-10-30, 07:12
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
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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