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Re: Debugging/Modifying HDFS from Eclipse - HDFS - [mail # user]
...MiniDFSCluster is used everywhere in HDFS's unit tests. You can easily find examples in the source code of HDFS (e.g., org.apache.hadoop.hdfs.TestDFSMkdirs). You can also test simple HA setu...
   Author: Jing Zhao, 2013-12-05, 23:00
Re: Deprecate BackupNode - HDFS - [mail # dev]
...+1. BackupNode also brings extra work for the recent https/http policy work, since we need to make sure the checkpoint works for all the policy/security combinations. We should deprecate it ...
   Author: Jing Zhao, 2013-12-04, 23:25
Re: Deprecate hftp / hsftp - HDFS - [mail # dev]
...+1  So I've reviewed most of Haohui's patch for developing swebhdfs, fixing https setup for hsftp, and supporting HA in webhdfs. For both webhdfs and swebhdfs we have run system tests o...
   Author: Jing Zhao, 2013-11-27, 02:01
[HDFS-5145] Revisit the needEnter() check in SafeModeInfo#canLeave() - HDFS - [issue]
...The current code in SafeModeInfo#canLeave checks needEnter() again. This may be unnecessary as per discussion in HDFS-5140. Let's revisit SafeModeInfo#canLeave in this jira....
http://issues.apache.org/jira/browse/HDFS-5145    Author: Jing Zhao, 2013-11-11, 18:51
[HDFS-4213] When the client calls hsync, allows the client to update the file length in the NameNode - HDFS - [issue]
...As per discussion in HDFS-3960 and HDFS-2802, when clients that need strong consistency update the file length at the NameNode, a special sync/flush is required for getting the length of the...
http://issues.apache.org/jira/browse/HDFS-4213    Author: Jing Zhao, 2013-11-10, 23:54
[HDFS-5371] Let client retry the same NN when "dfs.client.test.drop.namenode.response.number" is enabled - HDFS - [issue]
...Currently when dfs.client.test.drop.namenode.response.number is enabled for testing, the client will start failover and try the other NN. But in most of the testing cases we do not need to t...
http://issues.apache.org/jira/browse/HDFS-5371    Author: Jing Zhao, 2013-11-09, 13:36
[HDFS-5384] Add a new TransitionState to indicate NN is in transition from standby state to active state - HDFS - [issue]
...Currently in HA setup, when a NameNode is transitioning from standby to active, the current code first sets the state of the NN to Active, then starts the active service, during which the NN...
http://issues.apache.org/jira/browse/HDFS-5384    Author: Jing Zhao, 2013-10-21, 22:29
Re: high availability - HDFS - [mail # user]
...I think a real fencing is not required in case that you're using QJM-based HA. If you are using ZKFC, a graceful fencing will first be triggered in which ZKFC will send a RPC request to the ...
   Author: Jing Zhao, 2013-10-15, 20:59
[HDFS-5327] Rename StandbyException to FailoverException - HDFS - [issue]
...After HDFS-5291, client's RPC level can determine whether to retry the same server or failover to another server based on the two types of exception: The new introduced RetriableException in...
http://issues.apache.org/jira/browse/HDFS-5327    Author: Jing Zhao, 2013-10-08, 23:41
[HDFS-5137] Improve WriteManager for processing stable write requests and commit requests - HDFS - [issue]
...WriteManager#handleCommit needs to block until all the data before the commitOffset has been received. This jira plans to improve the current concurrency implementation for this blocking cal...
http://issues.apache.org/jira/browse/HDFS-5137    Author: Jing Zhao, 2013-10-02, 00:49
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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