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[HDFS-7643] Test case to ensure lazy persist files cannot be truncated - HDFS - [issue]
...Task to add test case for HDFS-7634. Ensure that an attempt to truncate a file created with LAZY_PERSIST policy is failed by the NameNode. For reference see TestLazyPersistFiles#testAppendIs...
http://issues.apache.org/jira/browse/HDFS-7643    Author: Arpit Agarwal, 2015-01-25, 01:58
[HDFS-5423] Verify initializations of LocatedBlock/RecoveringBlock - HDFS - [issue]
...Tracking Jira to make sure we verify initialization of LocatedBlock and RecoveringBlock, possibly reorg the constructors to make missing initialization of StorageIDs less likely....
http://issues.apache.org/jira/browse/HDFS-5423    Author: Arpit Agarwal, 2015-01-21, 19:53
[HDFS-5264] Consider renaming StorageID - HDFS - [issue]
...We should consider renaming StorageID to something else since we have changed the meaning of the field. Previously it was used to identify the single logical storage attached to a datanode a...
http://issues.apache.org/jira/browse/HDFS-5264    Author: Arpit Agarwal, 2015-01-21, 06:23
[HDFS-7649] Multihoming docs should emphasize using hostnames in configurations - HDFS - [issue]
...The docs should emphasize that master and slave configurations should hostnames wherever possible.Link to current docs: https://hadoop.apache.org/docs/r2.6.0/hadoop-project-dist/hadoop-hdfs/...
http://issues.apache.org/jira/browse/HDFS-7649    Author: Arpit Agarwal, 2015-01-21, 04:36
[HDFS-7596] NameNode should prune dead storages from storageMap - HDFS - [issue]
...The NameNode must be able to prune storages that are no longer reported by the DataNode and that have no blocks associated. These stale storages can skew the balancer behavior.Detailed discu...
http://issues.apache.org/jira/browse/HDFS-7596    Author: Arpit Agarwal, 2015-01-12, 15:04
[HDFS-5153] Datanode should send block reports for each storage in a separate message - HDFS - [issue]
...When the number of blocks on the DataNode grows large we start running into a few issues: Block reports take a long time to process on the NameNode. In testing we have seen that a block repo...
http://issues.apache.org/jira/browse/HDFS-5153    Author: Arpit Agarwal, 2015-01-08, 23:35
[HDFS-7572] TestLazyPersistFiles#testDnRestartWithSavedReplicas is flaky on Windows - HDFS - [issue]
...Error MessageExpected: is <DISK>     but: was <RAM_DISK>Stacktracejava.lang.AssertionError: Expected: is <DISK>     but: was <RAM_DISK> ...
http://issues.apache.org/jira/browse/HDFS-7572    Author: Arpit Agarwal, 2015-01-06, 21:12
[HDFS-6919] Enforce a single limit for RAM disk usage and replicas cached via locking - HDFS - [issue]
...The DataNode can have a single limit for memory usage which applies to both replicas cached via CCM and replicas on RAM disk.See comments 1, 2 and 3 for discussion....
http://issues.apache.org/jira/browse/HDFS-6919    Author: Arpit Agarwal, 2014-12-16, 15:45
[HDFS-6101] TestReplaceDatanodeOnFailure fails occasionally - HDFS - [issue]
...Exception details in a comment below.The failure repros on both OS X and Linux if I run the test ~10 times in a loop....
http://issues.apache.org/jira/browse/HDFS-6101    Author: Arpit Agarwal, 2014-12-16, 11:13
[HDFS-7503] Namenode restart after large deletions can cause slow processReport (due to logging) - HDFS - [issue]
...If a large directory is deleted and namenode is immediately restarted, there are a lot of blocks that do not belong to any file. This results in a log:2014-11-08 03:11:45,584 INFO BlockState...
http://issues.apache.org/jira/browse/HDFS-7503    Author: Arpit Agarwal, 2014-12-15, 21:54
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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