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[HDFS-5633] Improve OfflineImageViewer to use less memory - HDFS - [issue]
...Currently after we rename a file/dir which is included in a snapshot, the file/dir can be linked with two different reference INodes. To avoid saving/loading the inode multiple times in/from...
http://issues.apache.org/jira/browse/HDFS-5633    Author: Jing Zhao, 2013-12-06, 13:41
[HDFS-5590] Block ID and generation stamp may be reused when persistBlocks is set to false - HDFS - [issue]
...In a cluster with non-HA setup and dfs.persist.blocks set to false, we may have data loss in the following case: client creates file1 and requests a block from NN and get blk_id1_gs1 client ...
http://issues.apache.org/jira/browse/HDFS-5590    Author: Jing Zhao, 2013-12-06, 13:41
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-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
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