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[HADOOP-10513] ReflectionUtils::CONSTRUCTOR_CACHE leaks class loaders - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-10513    Author: Gopal V, 2015-07-30, 18:01
[HADOOP-11772] RPC Invoker relies on static ClientCache which has synchronized(this) blocks - Hadoop - [issue]
...  private static ClientCache CLIENTS=new ClientCache();...    this.client = CLIENTS.getClient(conf, factory);Meanwhile in ClientCachepublic synchronized Client getCl...
http://issues.apache.org/jira/browse/HADOOP-11772    Author: Gopal V, 2015-07-22, 23:10
[HADOOP-10694] Remove synchronized input streams from Writable deserialization - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-10694    Author: Gopal V, 2015-07-10, 11:02
[HADOOP-11029] FileSystem#Statistics uses volatile variables that must be updated on write or read calls. - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-11029    Author: Gopal V, 2015-07-08, 19:54
[HADOOP-11867] FS API: Add a high-performance vectored Read to FSDataInputStream API - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-11867    Author: Gopal V, 2015-06-17, 05:11
[HADOOP-11223] Offer a read-only conf alternative to new Configuration() - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-11223    Author: Gopal V, 2015-05-08, 21:24
[HADOOP-10681] Remove synchronized blocks from SnappyCodec and ZlibCodec buffering inner loop - Hadoop - [issue]
...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...
http://issues.apache.org/jira/browse/HADOOP-10681    Author: Gopal V, 2015-04-16, 20:03
[HADOOP-11771] Configuration::getClassByNameOrNull synchronizes on a static object - Hadoop - [issue]
...  private static final Map<ClassLoader, Map<String, WeakReference<Class<?>>>>    CACHE_CLASSES = new WeakHashMap<ClassLoader, Map<Strin...
http://issues.apache.org/jira/browse/HADOOP-11771    Author: Gopal V, 2015-03-31, 19:18
[HADOOP-11770] [Umbrella] locate static synchronized blocks in hadoop-common - Hadoop - [issue]
...There are several static synchronized blocks in the hadoop common functionality that hurts any multi-threaded processing system which uses the common APIs.Identify the static synchronized bl...
http://issues.apache.org/jira/browse/HADOOP-11770    Author: Gopal V, 2015-03-28, 04:06
[HADOOP-11226] Add a configuration to set ipc.Client's traffic class with IPTOS_LOWDELAY|IPTOS_RELIABILITY - Hadoop - [issue]
...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....
http://issues.apache.org/jira/browse/HADOOP-11226    Author: Gopal V, 2015-03-10, 15:36
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elasticsearch, apache solr, apache hbase, hadoop, redis, casssandra, amazon cloudwatch, mysql, memcached, apache kafka, apache zookeeper, apache storm, ubuntu, centOS, red hat, debian, puppet labs, java, senseiDB