[ https://issues.apache.org/jira/browse/HDFS-7435?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]
Kihwal Lee updated HDFS-7435: ----------------------------- Resolution: Fixed Fix Version/s: 2.7.0 Hadoop Flags: Reviewed Status: Resolved (was: Patch Available) Thanks everyone for reviews and Daryn for working on the patch. > PB encoding of block reports is very inefficient > ------------------------------------------------ > > Key: HDFS-7435 > URL: https://issues.apache.org/jira/browse/HDFS-7435 > Project: Hadoop HDFS > Issue Type: Improvement > Components: datanode, namenode > Affects Versions: 2.0.0-alpha, 3.0.0 > Reporter: Daryn Sharp > Assignee: Daryn Sharp > Priority: Critical > Fix For: 2.7.0 > > Attachments: HDFS-7435.000.patch, HDFS-7435.001.patch, > HDFS-7435.002.patch, HDFS-7435.patch, HDFS-7435.patch, HDFS-7435.patch, > HDFS-7435.patch, HDFS-7435.patch, HDFS-7435.patch, HDFS-7435.patch, > HDFS-7435.patch, HDFS-7435.patch > > > Block reports are encoded as a PB repeating long. Repeating fields use an > {{ArrayList}} with default capacity of 10. A block report containing tens or > hundreds of thousand of longs (3 for each replica) is extremely expensive > since the {{ArrayList}} must realloc many times. Also, decoding repeating > fields will box the primitive longs which must then be unboxed. -- This message was sent by Atlassian JIRA (v6.3.4#6332)