caozhiqiang

HDFS-16663. Allow block reconstruction pending timeout refreshable to increase decommission performance

3

In [HDFS-16613](https://issues.apache.org/jira/browse/HDFS-16613), increase the value of dfs.namenode.replication.max-streams-hard-limit would maximize the IO performance of the decommissioning DN, which has a lot of EC blocks. Besides this, we also need to decrease...

HDFS-17556. Avoid adding block to neededReconstruction repeatedly in decommission

16

[HDFS-17556](https://issues.apache.org/jira/browse/HDFS-17556) In decommission and maintenance process, before added to BlockManager::neededReconstruction block will be check if it has been added. The check contains if block is in BlockManager::neededReconstruction or in PendingReconstructionBlocks::pendingReconstructions...

HDFS-17858. Fix TestDFSAdmin#testAllDatanodesReconfig fails

4

TestDFSAdmin::testAllDatanodesReconfig() always failed because the last startReconfiguration() need some time to finish.