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[HADOOP-8926] hadoop.util.PureJavaCrc32 cache hit-ratio is low for static data - Hadoop - [issue]
...While running microbenchmarks for HDFS write codepath, a significant part of the CPU fraction was consumed by the DataChecksum.update(). The attached patch converts the static arrays in CRC3...
http://issues.apache.org/jira/browse/HADOOP-8926    Author: Gopal V, 2014-09-04, 00:19
[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, 2014-09-02, 19:01
[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, 2014-07-29, 22:30
[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, 2014-07-02, 20:20
[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, 2014-04-16, 22:16
[HADOOP-8921] ant build.xml in branch-1 ignores -Dcompile.native - Hadoop - [issue]
...ant -Dcompile.native=false still runs autoconf and libtoolizeAccording to ant 1.8 manual, any <target if> conditions are checked only after the dependencies are run through. The curren...
http://issues.apache.org/jira/browse/HADOOP-8921    Author: Gopal V, 2014-03-19, 21:13
[HADOOP-10047] Add a directbuffer Decompressor API to hadoop - Hadoop - [issue]
...With the Zero-Copy reads in HDFS (HDFS-5260), it becomes important to perform all I/O operations without copying data into byte[] buffers or other buffers which wrap over them.This is a prop...
http://issues.apache.org/jira/browse/HADOOP-10047    Author: Gopal V, 2014-01-31, 21:35
[HADOOP-9612] HADOOP client IPC layer should differentiate between interrupted threads and interrupts occurring during operations - Hadoop - [issue]
...Hadoop IPC throws misleading wrapped exceptions when operations are performed on threads which have already been interrupted.When a thread is already interrupted, the client IPC throws the f...
http://issues.apache.org/jira/browse/HADOOP-9612    Author: Gopal V, 2013-05-31, 18:58
[HADOOP-9570] Configuration.addResource() should only parse the new resource - Hadoop - [issue]
...Hadoop configuration parsing re-parses all configuration files when a new resource is added to the configuration object.This is wasteful and runs through every deprecation check unnecessaril...
http://issues.apache.org/jira/browse/HADOOP-9570    Author: Gopal V, 2013-05-21, 18:26
[HADOOP-9496] Bad merge of HADOOP-9450 on branch-2 breaks all bin/hadoop calls that need HADOOP_CLASSPATH - Hadoop - [issue]
...Merge of HADOOP-9450 to branch-2 is broken for hadoop-config.shon trunkhttp://svn.apache.org/viewvc/hadoop/common/trunk/hadoop-common-project/hadoop-common/src/main/bin/hadoop-config.sh?r1=1...
http://issues.apache.org/jira/browse/HADOOP-9496    Author: Gopal V, 2013-04-24, 03:36
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