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[HDFS-13946] Log longest FSN write/read lock held stack trace - HDFS - [issue]
...FSN write/read lock log statement only prints longest lock held interval not its stack trace during suppress warning interval. Only current thread is printed, but it looks not so useful. Onc...    Author: Yiqun Lin , 2018-10-09, 17:25
[HDFS-13962] Add null check for add-replica pool to avoid lock acquiring - HDFS - [issue]
...This is a follow-up work for HDFS-13768. Mainly two places needed to update: Add null check for add-replica pool to avoid lock acquiring In ReplicaMap#addAndGet, it would be better to use Fo...    Author: Yiqun Lin , 2018-10-09, 02:58
[HDFS-13768]  Adding replicas to volume map makes DataNode start slowly - HDFS - [issue]
...We find DN starting so slowly when rolling upgrade our cluster. When we restart DNs, the DNs start so slowly and not register to NN immediately. And this cause a lots of following error:Data...    Author: Yiqun Lin , 2018-10-09, 02:21
[HDFS-13957] Fix incorrect option used in description of InMemoryAliasMap - HDFS - [issue]
...The incorrect option was used in description of InMemoryAliasMap.This is a LevelDB-based alias map that runs as a separate server in Namenode. The alias map itself can be created using the f...    Author: Yiqun Lin , 2018-10-05, 02:20
[HDFS-13928] Add the corner case testings for log roll - HDFS - [issue]
...We find some corner cases for log roll when doing jounalnode migration in our cluster. We use a online way for the migration. And there will cause some corner cases: Multiple in-progress  ed...    Author: Yiqun Lin , 2018-09-20, 09:28
[HDFS-13884] Improve the description of the setting dfs.image.compress - HDFS - [issue]
...In HDFS-1435, we introduced a new option to store fsimage compressed. And this can avoid that It consumes a lot of network bandwidth when SBN do uploads a new fsimage to ANN. When lots of ne...    Author: Yiqun Lin , 2018-09-10, 06:23
[HDFS-13831] Make block increment deletion number configurable - HDFS - [issue]
...When NN deletes a large directory, it will hold the write lock long time. For improving this, we remove the blocks in a batch way. So that other waiters have a chance to get the lock. But ri...    Author: Yiqun Lin , 2018-08-28, 23:37
[HDFS-13671] Namenode deletes large dir slowly caused by FoldedTreeSet#removeAndGet - HDFS - [issue]
...NameNode hung when deleting large files/blocks. The stack info:"IPC Server handler 4 on 8020" #87 daemon prio=5 os_prio=0 tid=0x00007fb505b27800 nid=0x94c3 runnable [0x00007fa861361000] ...    Author: Yiqun Lin , 2018-08-25, 11:44
[HDFS-11398] TestDataNodeVolumeFailure#testUnderReplicationAfterVolFailure still fails intermittently - HDFS - [issue]
...The test TestDataNodeVolumeFailure#testUnderReplicationAfterVolFailure still fails intermittently in trunk after HDFS-11316. The stack infos:testUnderReplicationAfterVolFailure(org.apache.ha...    Author: Yiqun Lin , 2018-08-08, 20:54
[HDFS-11261] Document missing NameNode metrics - HDFS - [issue]
...Found two missing metric names in One is introduced by HDFS-10872, another one is HDFS-10676. In HDFS-10872, it adds MutableRate metrics for FSNamesystemLock operations. In HDFS-1...    Author: Yiqun Lin , 2018-08-03, 20:49