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https://issues.apache.org/jira/browse/HDFS-14027?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16667891#comment-16667891
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Xiao Chen commented on HDFS-14027:
----------------------------------
Failed test is HDFS-13975, unrelated to the change here.
> DFSStripedOutputStream should implement both hsync methods
> ----------------------------------------------------------
>
> Key: HDFS-14027
> URL: https://issues.apache.org/jira/browse/HDFS-14027
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: erasure-coding
> Affects Versions: 3.0.0
> Reporter: Xiao Chen
> Assignee: Xiao Chen
> Priority: Critical
> Attachments: HDFS-14027.01.patch, HDFS-14027.02.patch,
> HDFS-14027.03.patch
>
>
> In an internal spark investigation, it appears that when
> [EventLoggingListener|https://github.com/apache/spark/blob/7251be0c04f0380208e0197e559158a9e1400868/core/src/main/scala/org/apache/spark/scheduler/EventLoggingListener.scala#L152-L155]
> writes to an EC file, one may get exceptions reading, or get odd outputs. A
> sample exception is
> {noformat}
> hdfs dfs -cat /user/spark/applicationHistory/application_1540333573846_0003 |
> head -1
> 18/10/23 18:12:39 WARN impl.BlockReaderFactory: I/O error constructing remote
> block reader.
> java.io.IOException: Got error, status=ERROR, status message opReadBlock
> BP-1488936467-HOST_IP-1540333392519:blk_-9223372036854774960_1085 received
> exception java.io.IOException: Offset 0 and length 116161 don't match block
> BP-1488936467-HOST_IP-1540333392519:blk_-9223372036854774960_1085 ( blockLen
> 110296 ), for OP_READ_BLOCK, self=/HOST_IP:48610, remote=/HOST2_IP:20002, for
> file /user/spark/applicationHistory/application_1540333573846_0003, for pool
> BP-1488936467-HOST_IP-1540333392519 block -9223372036854774960_1085
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:134)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:110)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.checkSuccess(BlockReaderRemote.java:440)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.newBlockReader(BlockReaderRemote.java:408)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReader(BlockReaderFactory.java:848)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:744)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.build(BlockReaderFactory.java:379)
> at
> org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:644)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.createBlockReader(DFSStripedInputStream.java:264)
> at org.apache.hadoop.hdfs.StripeReader.readChunk(StripeReader.java:299)
> at org.apache.hadoop.hdfs.StripeReader.readStripe(StripeReader.java:330)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.readOneStripe(DFSStripedInputStream.java:326)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:419)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:829)
> at java.io.DataInputStream.read(DataInputStream.java:100)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:92)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:66)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:127)
> at
> org.apache.hadoop.fs.shell.Display$Cat.printToStdout(Display.java:101)
> at org.apache.hadoop.fs.shell.Display$Cat.processPath(Display.java:96)
> at
> org.apache.hadoop.fs.shell.Command.processPathInternal(Command.java:367)
> at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:331)
> at
> org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:304)
> at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:286)
> at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:270)
> at
> org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:119)
> at org.apache.hadoop.fs.shell.Command.run(Command.java:177)
> at org.apache.hadoop.fs.FsShell.run(FsShell.java:326)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at org.apache.hadoop.fs.FsShell.main(FsShell.java:389)
> 18/10/23 18:12:39 WARN hdfs.DFSClient: Failed to connect to /HOST2_IP:20002
> for blockBP-1488936467-HOST_IP-1540333392519:blk_-9223372036854774960_1085
> java.io.IOException: Got error, status=ERROR, status message opReadBlock
> BP-1488936467-HOST_IP-1540333392519:blk_-9223372036854774960_1085 received
> exception java.io.IOException: Offset 0 and length 116161 don't match block
> BP-1488936467-HOST_IP-1540333392519:blk_-9223372036854774960_1085 ( blockLen
> 110296 ), for OP_READ_BLOCK, self=/HOST_IP:48610, remote=/HOST2_IP:20002, for
> file /user/spark/applicationHistory/application_1540333573846_0003, for pool
> BP-1488936467-HOST_IP-1540333392519 block -9223372036854774960_1085
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:134)
> at
> org.apache.hadoop.hdfs.protocol.datatransfer.DataTransferProtoUtil.checkBlockOpStatus(DataTransferProtoUtil.java:110)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.checkSuccess(BlockReaderRemote.java:440)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderRemote.newBlockReader(BlockReaderRemote.java:408)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReader(BlockReaderFactory.java:848)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.getRemoteBlockReaderFromTcp(BlockReaderFactory.java:744)
> at
> org.apache.hadoop.hdfs.client.impl.BlockReaderFactory.build(BlockReaderFactory.java:379)
> at
> org.apache.hadoop.hdfs.DFSInputStream.getBlockReader(DFSInputStream.java:644)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.createBlockReader(DFSStripedInputStream.java:264)
> at org.apache.hadoop.hdfs.StripeReader.readChunk(StripeReader.java:299)
> at org.apache.hadoop.hdfs.StripeReader.readStripe(StripeReader.java:330)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.readOneStripe(DFSStripedInputStream.java:326)
> at
> org.apache.hadoop.hdfs.DFSStripedInputStream.readWithStrategy(DFSStripedInputStream.java:419)
> at org.apache.hadoop.hdfs.DFSInputStream.read(DFSInputStream.java:829)
> at java.io.DataInputStream.read(DataInputStream.java:100)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:92)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:66)
> at org.apache.hadoop.io.IOUtils.copyBytes(IOUtils.java:127)
> at
> org.apache.hadoop.fs.shell.Display$Cat.printToStdout(Display.java:101)
> at org.apache.hadoop.fs.shell.Display$Cat.processPath(Display.java:96)
> at
> org.apache.hadoop.fs.shell.Command.processPathInternal(Command.java:367)
> at org.apache.hadoop.fs.shell.Command.processPaths(Command.java:331)
> at
> org.apache.hadoop.fs.shell.Command.processPathArgument(Command.java:304)
> at org.apache.hadoop.fs.shell.Command.processArgument(Command.java:286)
> at org.apache.hadoop.fs.shell.Command.processArguments(Command.java:270)
> at
> org.apache.hadoop.fs.shell.FsCommand.processRawArguments(FsCommand.java:119)
> at org.apache.hadoop.fs.shell.Command.run(Command.java:177)
> at org.apache.hadoop.fs.FsShell.run(FsShell.java:326)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:76)
> at org.apache.hadoop.util.ToolRunner.run(ToolRunner.java:90)
> at org.apache.hadoop.fs.FsShell.main(FsShell.java:389)
> 18/10/23 18:12:39 WARN hdfs.DFSClient:
> [DatanodeInfoWithStorage[HOST2_IP:20002,DS-f5bc0566-eeb0-43aa-84b9-551a3a6d01a6,DISK]]
> are unavailable and all striping blocks on them are lost. IgnoredNodes = null
> {"Event":"SparkListenerLogStart","Spark Version":"2.4.0-cdh6.x-SNAPSHOT"}
> {noformat}
> Also, there are clearly {{fsync}} logs in NN for the file.
> Looking from code, the only way this can happen is through the {{hsync}}
> overload on {{DFSStripedOutputStream}}. We should make that consistent with
> the {{hsync}} without parameters. It seems this was simply missed from day0
> implementation in HDFS-7889.
> Credit to [~irashid] for investigating this issue from Spark
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