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[HADOOP-11239] [JDK8] azurenative tests fail builds on JDK8 - Hadoop - [issue]
...java.util.Base64 conflicts with com.microsoft.windowsazure.storage.core.Base64 in Azure unit tests....
http://issues.apache.org/jira/browse/HADOOP-11239    Author: Gopal V, 2014-10-28, 19:16
[HADOOP-11226] ipc.Client has to use setTrafficClass() 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, 2014-10-28, 19:13
[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, 2014-10-27, 23:10
[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
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NEW: Monitor These Apps!
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