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[HDFS-6830] BlockInfo.addStorage fails when DN changes the storage for a block replica - HDFS - [issue]
...The call to removeStorageInfo is wrong because the block is still in the DatanodeStorage's list of blocks and the callee does not expect it to be.      } else { &nbs...
http://issues.apache.org/jira/browse/HDFS-6830    Author: Arpit Agarwal, 2015-03-27, 21:32
[HDFS-5682] Heterogeneous Storage phase 2 - APIs to expose Storage Types - HDFS - [issue]
...Phase 1 (HDFS-2832) added support to present the DataNode as a collection of discrete storages of different types.This Jira is to track phase 2 of the Heterogeneous Storage work which involv...
http://issues.apache.org/jira/browse/HDFS-5682    Author: Arpit Agarwal, 2015-03-27, 19:36
[HDFS-7944] Minor cleanup of BlockPoolManager#getAllNamenodeThreads - HDFS - [issue]
...BlockPoolManager#getAllNamenodeThreads can avoid unnecessary list to array conversion and vice versa by returning an unmodifiable list.Since NN addition/removal is relatively rare we can jus...
http://issues.apache.org/jira/browse/HDFS-7944    Author: Arpit Agarwal, 2015-03-17, 23:03
[HDFS-7896] HDFS Slow disk detection - HDFS - [issue]
...HDFS should detect slow disks. To start with we can flag this information via the NameNode web UI. Alternatively DNs can avoid using slow disks for writes....
http://issues.apache.org/jira/browse/HDFS-7896    Author: Arpit Agarwal, 2015-03-14, 07:05
[HDFS-7924] NameNode goes into infinite lease recovery - HDFS - [issue]
...We encountered an HDFS lease recovery issue. All DataNodes+NameNodes were restarted while a client was running. A block was created on the NN but it had not yet been created on DNs. The NN t...
http://issues.apache.org/jira/browse/HDFS-7924    Author: Arpit Agarwal, 2015-03-13, 08:11
[HDFS-7757] Misleading error messages in FSImage.java - HDFS - [issue]
...If a quota violation is detected while loading an image, the NameNode logs scary error messages indicating a bug. However the quota violation state is very easy to get into e.g. Copy a 2MB f...
http://issues.apache.org/jira/browse/HDFS-7757    Author: Arpit Agarwal, 2015-03-04, 15:35
[HDFS-7192] DN should ignore lazyPersist hint if the writer is not local - HDFS - [issue]
...The DN should ignore allowLazyPersist hint to DataTransferProtocol#writeBlock if the writer is not local.Currently we don't restrict memory writes to local clients. For in-cluster clients th...
http://issues.apache.org/jira/browse/HDFS-7192    Author: Arpit Agarwal, 2015-03-02, 16:55
[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, 2015-02-20, 17:46
[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, 2015-02-17, 23:43
Re: Erratic Jenkins behavior - HDFS - [mail # dev]
...Sorry I donĀ¹t have much insight into this either. Our Jenkins setup is abit of a black box to me.Too few of us have access to the build hosts and it makes debuggingdifficult. Perhaps we shou...
   Author: Arpit Agarwal, 2015-02-09, 20:26
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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