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[HDFS-15323] StandbyNode fails transition to active due to insufficient transaction tailing - HDFS - [issue]
...StandbyNode is asked to transitionToActive(). If it fell too far behind in tailing journal transaction (from QJM) it can crash with IllegalStateException....    Author: Konstantin Shvachko , 2020-05-12, 16:13
[HDFS-15325] TestRefreshCallQueue is failing due to changed CallQueue constructor - HDFS - [issue]
...TestRefreshCallQueue.MockCallQueue cannot be instantiated, as it is missing a parameter in the constructor, which was added by HADOOP-17010....    Author: Konstantin Shvachko , 2020-05-03, 04:14
[HADOOP-17026] TestRefreshCallQueue is failing due to changed CallQueue constructor - Hadoop - [issue]    Author: Konstantin Shvachko , 2020-05-02, 19:53
[HDFS-15036] Active NameNode should not silently fail the image transfer - HDFS - [issue]
...Image transfer from Standby NameNode to  Active silently fails on Active, without any logging and not notifying the receiver side....    Author: Konstantin Shvachko , 2020-04-24, 22:22
[HDFS-15291] [SBN read] Implement CyclicalBlockingQueue to avoid requing RPC calls on Observer. - HDFS - [issue]
...RPC queue is currently based on LinkedBlockingQueue, which is FIFO.For Observer we delay execution of a call if its lastSeenStateId is larger than the stateId of the Observer. The delay impl...    Author: Konstantin Shvachko , 2020-04-21, 02:03
[HDFS-15290] NPE in HttpServer during NameNode startup - HDFS - [issue]
...When NameNode starts it first starts HttpServer, then starts loading fsImage and edits. While loading the namesystem field in NameNode is null. I saw that a StandbyNode sends a checkpoint re...    Author: Konstantin Shvachko , 2020-04-21, 01:33
[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 , 2020-04-20, 22:09
[HDFS-15118] [SBN Read] Slow clients when Observer reads are enabled but there are no Observers on the cluster. - HDFS - [issue]
...We see substantial degradation in performance of HDFS clients, when Observer reads are enabled via ObserverReadProxyProvider, but there are no ObserverNodes on the cluster....    Author: Konstantin Shvachko , 2020-03-23, 18:19
[HDFS-15111] stopStandbyServices() should log which service state it is transitioning from. - HDFS - [issue]
...Trying to transition Observer to Standby state. stopStandbyServices() logs that it is "Stopping services started for standby state". It should be "Stopping services started for observer stat...    Author: Konstantin Shvachko , 2020-03-02, 23:44
[HDFS-14731] [FGL] Remove redundant locking on NameNode. - HDFS - [issue]
...Currently NameNode has two global locks: FSNamesystemLock and FSDirectoryLock. An analysis shows that single FSNamesystemLock is sufficient to guarantee consistency of the NameNode state. FS...    Author: Konstantin Shvachko , 2020-02-28, 00:13