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[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-5080] BootstrapStandby not working with QJM when the existing NN is active - HDFS - [issue]
...Currently when QJM is used, running BootstrapStandby while the existing NN is active can get the following exception:FATAL ha.BootstrapStandby: Unable to read transaction ids 6175397-6175405...
http://issues.apache.org/jira/browse/HDFS-5080    Author: Jing Zhao, 2013-11-05, 20:01
[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
[HDFS-5217] Namenode log directory link is inaccessible in secure cluster - HDFS - [issue]
...Currently in a secured HDFS cluster, 401 error is returned when clicking the "NameNode Logs" link.Looks like the cause of the issue is that the httpServer does not correctly set the security...
http://issues.apache.org/jira/browse/HDFS-5217    Author: Jing Zhao, 2013-09-26, 01:15
[HDFS-5212] Refactor RpcMessage and NFS3Response to support different types of authentication information - HDFS - [issue]
...Currently the authentication information is hard coded in RpcMessage (and its subclasses) and NFS3Response (and its subclasses) as AuthFlavor value and empty byte array. We need to refactor ...
http://issues.apache.org/jira/browse/HDFS-5212    Author: Jing Zhao, 2013-09-25, 00:33
[HDFS-5045] Add more unit tests for retry cache to cover all AtMostOnce methods - HDFS - [issue]
http://issues.apache.org/jira/browse/HDFS-5045    Author: Jing Zhao, 2013-09-25, 00:33
[HDFS-4971] Move IO operations out of locking in OpenFileCtx - HDFS - [issue]
...Currently some IO operations (such as writing data to HDFS and dumping to local disk) in OpenFileCtx may hold a lock which can block processing incoming writing requests. This jira aims to o...
http://issues.apache.org/jira/browse/HDFS-4971    Author: Jing Zhao, 2013-09-24, 14:29
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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