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[HADOOP-10694] Remove synchronized input streams from Writable deserialization
...Writable deserialization is slowing down due to a synchronized block within DataInputBuffer$Buffer.ByteArrayInputStream::read() is synchronized and this shows up as a slow uncontested lock.H...
, 2016-05-11, 01:58
[HADOOP-12956] Inevitable Log4j2 migration via slf4j
...5 August 2015 --The Apache Logging Services™ Project Management Committee (PMC) has announced that the Log4j™ 1.x logging framework has reached its end of life (EOL) and is no longer officia...
, 2016-03-29, 17:34
[HADOOP-11771] Configuration::getClassByNameOrNull synchronizes on a static object
... IPC Client (1970436060) connection to cn106-10.l42scl.hortonworks.com/172.21.128.106:34530 from application_1442254312093_2976 [BLOCKED] [DAEMON]org.apache.hadoop.conf.Configuration.ge...
, 2015-11-14, 06:37
[HADOOP-11226] Add a configuration to set ipc.Client's traffic class with IPTOS_LOWDELAY|IPTOS_RELIABILITY
...During heavy shuffle, packet loss for IPC packets was observed from a machine.Avoid packet-loss and speed up transfer by using 0x14 QOS bits for the packets....
, 2015-09-24, 20:57
[HADOOP-10513] ReflectionUtils::CONSTRUCTOR_CACHE leaks class loaders
...Any code which uses custom class-loaders needs to be aware of the ReflectionUtils::CONSTRUCTOR_CACHE /** * Cache of constructors for each class. Pins the classes so they&n...
, 2015-07-30, 18:01
[HADOOP-11772] RPC Invoker relies on static ClientCache which has synchronized(this) blocks
... private static ClientCache CLIENTS=new ClientCache();... this.client = CLIENTS.getClient(conf, factory);Meanwhile in ClientCachepublic synchronized Client getClient(Confi...
, 2015-07-22, 23:10
[HADOOP-11029] FileSystem#Statistics uses volatile variables that must be updated on write or read calls.
...This code is there in the hot-path of IFile writer via RawLocalFileSystem.From a preliminary glance, the lock prefix calls are coming from a threadlocal.get() within FileSystem.Statistics &n...
, 2015-07-08, 19:54
[HADOOP-11867] FS API: Add a high-performance vectored Read to FSDataInputStream API
...The most significant way to read from a filesystem in an efficient way is to let the FileSystem implementation handle the seek behaviour underneath the API to be the most efficient as possib...
, 2015-06-17, 05:11
[HADOOP-11223] Offer a read-only conf alternative to new Configuration()
...new Configuration() is called from several static blocks across Hadoop.This is incredibly inefficient, since each one of those involves primarily XML parsing at a point where the JIT won't b...
, 2015-05-08, 21:24
[HADOOP-10681] Remove synchronized blocks from SnappyCodec and ZlibCodec buffering inner loop
...The current implementation of SnappyCompressor spends more time within the java loop of copying from the user buffer into the direct buffer allocated to the compressor impl, than the time it...
, 2015-04-16, 20:03
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