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Jing Zhao commented on HDFS-7678: --------------------------------- bq. To reduce dependency on codec and output stream, I will keep adding tests to TestReadStripedFile I think to make the test simple, we can use end-to-end tests like TestDFSStripedInputStream. But the test setting, like which and how many DNs to shutdown, and which offset/length to read, should be created according to the internal logic so that we can cover all the cases. bq. would be great if you can review HDFS-8334 first Sure, will do. > Erasure coding: DFSInputStream with decode functionality (pread) > ---------------------------------------------------------------- > > Key: HDFS-7678 > URL: https://issues.apache.org/jira/browse/HDFS-7678 > Project: Hadoop HDFS > Issue Type: Sub-task > Affects Versions: HDFS-7285 > Reporter: Li Bo > Assignee: Zhe Zhang > Attachments: BlockGroupReader.patch, HDFS-7678-HDFS-7285.002.patch, > HDFS-7678-HDFS-7285.003.patch, HDFS-7678-HDFS-7285.004.patch, > HDFS-7678-HDFS-7285.005.patch, HDFS-7678-HDFS-7285.006.patch, > HDFS-7678-HDFS-7285.007.patch, HDFS-7678-HDFS-7285.008.patch, > HDFS-7678-HDFS-7285.009.patch, HDFS-7678-HDFS-7285.010.patch, > HDFS-7678.000.patch, HDFS-7678.001.patch > > > A block group reader will read data from BlockGroup no matter in striping > layout or contiguous layout. The corrupt blocks can be known before > reading(told by namenode), or just be found during reading. The block group > reader needs to do decoding work when some blocks are found corrupt. -- This message was sent by Atlassian JIRA (v6.3.4#6332)