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From "Xiao Chen (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (HDFS-14027) DFSStripedOutputStream should implement both hsync methods
Date Sat, 27 Oct 2018 03:47:00 GMT

     [ https://issues.apache.org/jira/browse/HDFS-14027?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Xiao Chen updated HDFS-14027:
-----------------------------
    Attachment: HDFS-14027.03.patch

> 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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