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Walter Su commented on HDFS-8120: --------------------------------- I carefully read {{DFSStripedOutputStream.writeParityCellsForLastStripe()}}, the {{lastStripeSizePerBlock}} (or you can call it "the last partial unfilled cell") in data block and in parity block are same. {{lastStripeSizePerBlock}} equals to the size of (partial or not) cell in the *first* data block. So I think the calculation is: {code:java} public static long getSizeOfInternalBlock(long blkGroupSize, int cellSize, int dataBlkNum) { int numStripes = (int) (blkGroupSize / (cellSize * dataBlkNum)); long blkSize = numStripes * cellSize; long lastStripeSize = blkGroupSize - numStripes * cellSize * dataBlkNum; long lastStripeSizePerBlock = Math.min(cellSize, lastStripeSize); blkSize += lastStripeSizePerBlock; return blkSize; } {code} > Erasure coding: created util class to analyze striped block groups > ------------------------------------------------------------------ > > Key: HDFS-8120 > URL: https://issues.apache.org/jira/browse/HDFS-8120 > Project: Hadoop HDFS > Issue Type: Sub-task > Reporter: Zhe Zhang > Assignee: Zhe Zhang > Attachments: HDFS-8120.000.patch, HDFS-8120.001.patch > > > The patch adds logic of calculating size of individual blocks in a striped > block group. -- This message was sent by Atlassian JIRA (v6.3.4#6332)