Lin Yiqun created HDFS-9747: ------------------------------- Summary: Reuse objectMapper instance in MapReduce Key: HDFS-9747 URL: https://issues.apache.org/jira/browse/HDFS-9747 Project: Hadoop HDFS Issue Type: Improvement Components: performance Affects Versions: 2.7.1 Reporter: Lin Yiqun Assignee: Lin Yiqun
Now in MapReduce, there are some places creating a new ObjectMapper instance every time. In wiki of ObjectMapper, it suggested: {code} Further: it is beneficial to use just one instance (or small number of instances) for data binding; many optimizations for reuse (of symbol tables, some buffers) depend on ObjectMapper instances being reused. {code} http://webcache.googleusercontent.com/search?q=cache:kybMTIJC6F4J:wiki.fasterxml.com/JacksonFAQ+&cd=4&hl=ja&ct=clnk&gl=jp, it's similar to HDFS-9724. -- This message was sent by Atlassian JIRA (v6.3.4#6332)