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Hadoop QA commented on HDFS-7435: --------------------------------- {color:red}-1 overall{color}. Here are the results of testing the latest attachment http://issues.apache.org/jira/secure/attachment/12704194/HDFS-7435.patch against trunk revision 06ce1d9. {color:red}-1 patch{color}. Trunk compilation may be broken. Console output: https://builds.apache.org/job/PreCommit-HDFS-Build/9853//console This message is automatically generated. > 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 > 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)