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[HDFS-12979] StandbyNode should upload FsImage to ObserverNode after checkpointing. - HDFS - [issue]
...ObserverNode does not create checkpoints. So it's fsimage file can get very old making bootstrap of ObserverNode too long. A StandbyNode should copy latest fsimage to ObserverNode(s) along w...    Author: Konstantin Shvachko , 2019-05-22, 01:24
[HDFS-14502] keepResults option in NNThroughputBenchmark should call saveNamespace() - HDFS - [issue]
...-keepResults option is usually used to make it possible to rerun  NNThroughputBenchmark with existing namespace state -useExisting. E.g. first generate files with create command and the...    Author: Konstantin Shvachko , 2019-05-21, 18:08
[HDFS-14494] Move Server logging of StatedId inside receiveRequestState() - HDFS - [issue]
...HDFS-14270 introduced logging of the client and server StateIds in trace level. Unfortunately one of the arguments alignmentContext.getLastSeenStateId() holds a lock on FSEdits, which is cal...    Author: Konstantin Shvachko , 2019-05-15, 18:56
[HDFS-12943] Consistent Reads from Standby Node - HDFS - [issue]
...StandbyNode in HDFS is a replica of the active NameNode. The states of the NameNodes are coordinated via the journal. It is natural to consider StandbyNode as a read-only replica. As with an...    Author: Konstantin Shvachko , 2019-04-17, 18:06
[expand - 1 more] - [DISCUSS] Merging YARN-8200 to branch-3.0 and branch-2 - MapReduce - [mail # dev]
...Sounds like a good idea to me.This has been tested on branch-2 in production for some time and benchmarkslook good.Thanks,--KonstantinOn Fri, Mar 29, 2019 at 12:14 PM Jonathan Hung  wro...
   Author: Konstantin Shvachko , 2019-03-29, 22:11
[HDFS-14347] Restore a comment line mistakenly removed in ProtobufRpcEngine - HDFS - [issue]
...HDFS-12977 mistakenly removed the following comment line in ProtobufRpcEngine.Server.Server()-     * the range of ports used when port is 0 (an ephemeral port)+     * @pa...    Author: Konstantin Shvachko , 2019-03-12, 02:13
[HDFS-12977] Add stateId to RPC headers. - HDFS - [issue]
...stateId is a new field in the RPC headers of NameNode proto calls.stateId is the journal transaction Id, which represents LastSeenId for the clients and LastWrittenId for NameNodes. See more...    Author: Konstantin Shvachko , 2019-03-07, 23:39
[HDFS-13781] Unit tests for standby reads. - HDFS - [issue]
...Create more unit tests supporting standby reads feature. Let's come up with a list of tests that provide sufficient test coverage....    Author: Konstantin Shvachko , 2019-02-25, 22:55
[HDFS-13961] TestObserverNode refactoring - HDFS - [issue]
...TestObserverNode combines unit tests for ObserverNode. The tests are of different types. I propose to split them into separate modules, factor out common methods, and optimize it so that it ...    Author: Konstantin Shvachko , 2019-02-25, 22:55
[HDFS-14130] Make ZKFC ObserverNode aware - HDFS - [issue]
...Need to fix automatic failover with ZKFC. Currently it does not know about ObserverNodes trying to convert them to SBNs....    Author: Konstantin Shvachko , 2019-02-25, 22:51