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From "Andrew Purtell (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (HBASE-12081) Considering Java 9
Date Wed, 24 Sep 2014 17:20:35 GMT

    [ https://issues.apache.org/jira/browse/HBASE-12081?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14146553#comment-14146553
] 

Andrew Purtell commented on HBASE-12081:
----------------------------------------

For an earlier discussion with folks at Oracle I ran jdeps analysis over the core Hadoop ecosystem
and related projects that have notable or emerging user bases (in my opinion, some may debate...):
Hadoop, ZooKeeper, Hive(+Tez), Pig, HBase, Oozie, Flume, Sqoop, Avro, Thrift, Accumulo, Cassandra,
Crunch, Cascading, Elasticsearch, Giraph, Kafka, Mahout, Parquet, Optiq, Solr/Lucene, Spark,
Storm. I picked recent releases except for HBase and Optiq, which I built from source. For
Optiq because I could not find a binary distribution at the time. For HBase I used 0.99-SNAPSHOT
because it has the new dependencies on Netty 4 and the LMAX Disruptor that will be in the
upcoming 1.0 release. There are some common dependencies (Netty, Guava, Derby, the Scala runtime,
Coda Hale's Metrics, LMAX Disruptor) that use internal sun.* APIs. We would need versions
of these dependencies which do not make those calls available before we could eliminate internal
API calls through this route. Other uses fall into a few common patterns. Daemons use Signal/SignalHandler
for catching signals. Datastores such as HBase, Hive, and Cassandra are seeking their own
high performance optimizations with Unsafe, including direct memory allocation. Avro and Kyro
are serialization libraries seeking high performance via Unsafe on hot code paths. Hadoop
and HBase utilize some security APIs for Kerberos and SSL which seem to have no non-internal
API analogues. Pig and HBase pull in Jython and JRuby, respectively. Jython uses a bit of
Unsafe. JRuby is an aggressive user of JVM internals.

> Considering Java 9
> ------------------
>
>                 Key: HBASE-12081
>                 URL: https://issues.apache.org/jira/browse/HBASE-12081
>             Project: HBase
>          Issue Type: Umbrella
>            Reporter: Andrew Purtell
>
> Java 9 will ship in 2016. This will be the first Java release that makes a significant
compatibility departure from earlier runtimes. 



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