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[HADOOP-13426] More efficiently build IPC responses
...The call response buffer is allowed to dynamically grow until a max size is reached. Often times the full size of the response can be known in advance which avoids copies. This i...
, 2016-08-03, 15:01
[HADOOP-13429] Dispose of unnecessary SASL servers
...The IPC server retains a per-connection SASL server for the duration of the connection. This causes many unnecessary objects to be promoted to old gen. The SASL server should be ...
, 2016-08-02, 16:00
[HADOOP-9956] RPC listener inefficiently assigns connections to readers
...The socket listener and readers use a complex synchronization to update the reader's NIO Selector. Updating active selectors is not thread-safe so precautions are required.However, the...
, 2016-06-08, 03:28
[HADOOP-10940] RPC client does no bounds checking of responses
...The rpc client does no bounds checking of server responses. In the case of communicating with an older and incompatible RPC, this may lead to OOM issues and leaking of resources....
, 2016-06-05, 05:53
[HADOOP-10014] Symlink resolution is fundamentally broken for multi-layered filesystems
...Symlink resolution is performed on a per-filesystem basis. In a multi-layered filesystem, the symlinks need to be resolved relative to the highest level filesystem in the stack. ...
, 2016-06-05, 05:51
[HADOOP-9749] Remove synchronization for UGI.getCurrentUser
...HADOOP-7854 added synchronization to getCurrentUser due to ConcurrentModificationExceptions. This degrades NN call handler performance.The problem was not well understood at the time, ...
, 2016-06-05, 05:50
[HADOOP-9747] Reduce unnecessary UGI synchronization
...Jstacks of heavily loaded NNs show up to dozens of threads blocking in the UGI....
, 2016-06-05, 05:50
[HADOOP-9317] User cannot specify a kerberos keytab for commands
...UserGroupInformation only allows kerberos users to be logged in via the ticket cache when running hadoop commands. UGI allows a keytab to be used, but it's only exposed programatically...
, 2016-06-05, 05:49
[HADOOP-10942] Globbing optimizations and regression fix
...When globbing was commonized to support both filesystem and filecontext, it regressed a fix that prevents an intermediate glob that matches a file from throwing a confusing permissions excep...
, 2016-05-13, 20:31
[HADOOP-11780] Prevent IPC reader thread death
...Reader threads can die to a race condition with the responder thread. If the server's ipc handler cannot send a response in one write, it delegates sending the rest of the response to ...
, 2016-04-10, 16:20
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