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Tsz Wo Nicholas Sze commented on HDFS-6934: ------------------------------------------- We have the following cases in datanode side when receiving a packet: || No Checksum Received || Writing to Transient Storage || Action || | T | T | No checksum is stored | | T | F | Compute checksum and write to disk | | F | T | Write checksum to memory | | F | F | Write checksum to disk | > Move checksum computation off the hot path when writing to RAM disk > ------------------------------------------------------------------- > > Key: HDFS-6934 > URL: https://issues.apache.org/jira/browse/HDFS-6934 > Project: Hadoop HDFS > Issue Type: Sub-task > Components: datanode > Reporter: Arpit Agarwal > Assignee: Tsz Wo Nicholas Sze > > Since local RAM is considered reliable we can avoid writing checksums on the > hot path when replicas are being written to a local RAM disk. > The checksum can be computed by the lazy writer when moving replicas to disk. -- This message was sent by Atlassian JIRA (v6.3.4#6332)