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Lin Yiqun updated MAPREDUCE-6626: --------------------------------- Attachment: MAPREDUCE-6626.004.patch Update the latest patch. > Reuse objectMapper instance in MapReduce > ---------------------------------------- > > Key: MAPREDUCE-6626 > URL: https://issues.apache.org/jira/browse/MAPREDUCE-6626 > Project: Hadoop Map/Reduce > Issue Type: Improvement > Components: performance > Affects Versions: 2.7.1 > Reporter: Lin Yiqun > Assignee: Lin Yiqun > Attachments: MAPREDUCE-6626.002.patch, MAPREDUCE-6626.003.patch, > MAPREDUCE-6626.004.patch, MAPREDUCE.001.patch > > > 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)