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[HDFS-8432] Introduce a minimum compatible layout version to allow downgrade in more rolling upgrade use cases. - HDFS - [issue]
...Maintain the prior layout version during the upgrade window and reject attempts to use new features until after the upgrade has been finalized.  This guarantees that the prior software ...    Author: Chris Nauroth , 2020-07-10, 06:28
[ZOOKEEPER-2342] Migrate to Log4J 2. - ZooKeeper - [issue]
...ZOOKEEPER-1371 removed our source code dependency on Log4J.  It appears that this also removed the Log4J SLF4J binding jar from the runtime classpath.  Without any SLF4J binding ja...    Author: Chris Nauroth , 2020-05-04, 15:49
[HADOOP-13728] S3A can support short user-friendly aliases for configuration of credential providers. - Hadoop - [issue]
...This issue proposes to support configuration of the S3A credential provider chain using short aliases to refer to the common credential providers in addition to allowing full class names. &n...    Author: Chris Nauroth , 2020-04-09, 18:55
[HADOOP-13733] Support WASB connections through an HTTP proxy server. - Hadoop - [issue]
...WASB currently does not support use of an HTTP proxy server to connect to the Azure Storage back-end.  The Azure Storage SDK does support use of a proxy, so we can enhance WASB to read ...    Author: Chris Nauroth , 2020-04-09, 18:55
[HADOOP-13581] Expand FileSystem specification to describe differences between FileSystem and FileContext. - Hadoop - [issue]
...Sometimes there are behavioral differences between using the FileSystem API and using the FileContext API.  This issue proposes to enhance the specification to describe these difference...    Author: Chris Nauroth , 2020-04-09, 18:55
[HADOOP-13762] S3A: Set thread names with more specific information about the call. - Hadoop - [issue]
...Running jstack on a hung process and reading the stack traces is a helpful way to determine exactly what code in the process is stuck.  This would be even more helpful if we included mo...    Author: Chris Nauroth , 2020-04-09, 18:52
[HADOOP-13726] Enforce that FileSystem initializes only a single instance of the requested FileSystem. - Hadoop - [issue]
...The FileSystem cache is intended to guarantee reuse of instances by multiple call sites or multiple threads.  The current implementation does provide this guarantee, but there is a brie...    Author: Chris Nauroth , 2020-04-09, 18:52
[HADOOP-13625] Document FileSystem actions that trigger update of modification time. - Hadoop - [issue]
...Hadoop users and developers of Hadoop-compatible file systems have sometimes asked questions about which file system actions trigger an update of the path's modification time.  This iss...    Author: Chris Nauroth , 2020-04-09, 18:51
[HADOOP-13607] Specify and test contract for FileSystem#close. - Hadoop - [issue]
...This issue proposes to enhance the FileSystem specification by describing the expected semantics of FileSystem#close and adding corresponding contract tests.  Notable aspects are that t...    Author: Chris Nauroth , 2020-04-09, 18:51
[HDFS-11063] Set NameNode RPC server handler thread name with more descriptive information about the RPC call. - HDFS - [issue]
...We often run jstack on a NameNode process as a troubleshooting step if it is suffering high load or appears to be hanging.  By reading the stack trace, we can identify if a caller is bl...    Author: Chris Nauroth , 2020-04-09, 18:47