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Colin Patrick McCabe
Arun C Murthy
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[HADOOP-13425] IPC layer optimizations
...Umbrella jira for y! optimizations to reduce object allocations, more efficiently use protobuf APIs, unified ipc and webhdfs callq to enable QoS, etc....
, 2016-08-24, 20:36
[HADOOP-13537] Support external calls in the RPC call queue
...Leveraging HADOOP-13465 will allow non-rpc calls to be added to the call queue. This is intended to support routing webhdfs calls through the call queue to provide a unified and protoc...
, 2016-08-23, 21:06
[HADOOP-13465] Design Server.Call to be extensible for unified call queue
...The RPC layer supports QoS but other protocols, ex. webhdfs, are completely unconstrained. Generalizing Server.Call to be extensible with simple changes to the handlers will enable uni...
, 2016-08-23, 20:52
[HADOOP-13052] ChecksumFileSystem mishandles crc file permissions
...CheckFileSystem does not override permission related calls to apply those operations to the hidden crc files. Clients may be unable to read the crcs if the file is created with strict ...
, 2016-08-23, 18:07
[HADOOP-13442] Optimize UGI group lookups
...UGI#getGroups and its usage is inefficient. The list is unnecessarily converted to multiple collections.For every invocation, the List<String> from the group provider is converte...
, 2016-08-18, 17:55
[HADOOP-12858] Reduce UGI getGroups overhead
...Group lookup generates excessive garbage with multiple conversions between collections and arrays....
, 2016-08-18, 17:55
[HADOOP-12861] RPC client fails too quickly when server connection limit is reached
...The NN's rpc server immediately closes new client connections when a connection limit is reached. The client rapidly retries a small number of times with no delay which causes clients to fai...
, 2016-08-18, 01:05
[HADOOP-13438] Optimize IPC server protobuf decoding
...The current use of the protobuf API uses an expensive code path. The builder uses the parser to instantiate a message, then copies the message into the builder. The parser is cre...
, 2016-08-08, 19:49
[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
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