[HDFS-9768] Reuse objectMapper instance in HDFS to improve the performance

• Type: Improvement
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 2.7.1
• Fix Version/s: 2.8.0, 3.0.0-alpha1
• Component/s: performance
• Hadoop Flags: Reviewed
• Assignee: Yiqun Lin
• Reporter: Yiqun Lin
• Created: 05/Feb/16 06:24
• Updated: 30/Aug/16 01:19
• Resolved: 12/Feb/16 17:06

Description

In HDFS-9724, it have reused the ObjectMapper instance to improve the performance in WebHDFS. But in other places, it still using ObjectMapper by new ObjectMapper(). We probably need a comprehensive review across the whole codebase to look for this pattern and modify them. In MAPREDUCE-6626, YARN-4668, these jiras also work for this.

Issue Links

• is related to: HDFS-10560 DiskBalancer: Reuse ObjectMapper instance to improve the performance
• is related to: HDFS-10568 Reuse ObjectMapper instance in CombinedHostsFileReader and CombinedHostsFileWriter
• relates to: YARN-4668 Reuse objectMapper instance in Yarn
• relates to: MAPREDUCE-6626 Reuse ObjectMapper instance in MapReduce