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Date: Thu, 5 Oct 2017 19:01:00 +0000 (UTC)
From: "Andrew Wang (JIRA)" <jira@apache.org>
To: hdfs-issues@hadoop.apache.org
Message-ID: <JIRA.13106128.1506715246000.282057.1507230060181@Atlassian.JIRA>
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Subject: [jira] [Updated] (HDFS-12567) BlockPlacementPolicyRackFaultTolerant
 fails with racks with very few nodes
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archived-at: Thu, 05 Oct 2017 19:01:05 -0000


     [ https://issues.apache.org/jira/browse/HDFS-12567?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel ]

Andrew Wang updated HDFS-12567:
-------------------------------
    Attachment: HDFS-12567.003.patch

Fix checkstyles.

> BlockPlacementPolicyRackFaultTolerant fails with racks with very few nodes
> --------------------------------------------------------------------------
>
>                 Key: HDFS-12567
>                 URL: https://issues.apache.org/jira/browse/HDFS-12567
>             Project: Hadoop HDFS
>          Issue Type: Bug
>          Components: erasure-coding
>    Affects Versions: 3.0.0-alpha1
>            Reporter: Andrew Wang
>            Assignee: Andrew Wang
>              Labels: hdfs-ec-3.0-must-do
>         Attachments: HDFS-12567.001.patch, HDFS-12567.002.patch, HDFS-12567.003.patch, HDFS-12567.repro.patch
>
>
> Found this while doing some testing on an internal cluster with an unusual setup. We have a rack with ~20 nodes, then a few more with just a few nodes. It would fail to get (# data blocks) datanodes even though there were plenty of DNs on the rack with 20 DNs.
> I managed to reproduce this same issue in a unit test, stack trace like this:
> {noformat}
> java.io.IOException: File /testfile0 could only be written to 5 of the 6 required nodes for RS-6-3-1024k. There are 9 datanode(s) running and no node(s) are excluded in this operation.
> 	at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:2083)
> 	at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.chooseTargetForNewBlock(FSDirWriteFileOp.java:286)
> 	at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2609)
> 	at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:863)
> 	at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:548)
> 	at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> 	at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:523)
> 	at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
> 	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:869)
> 	at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:815)
> 	at java.security.AccessController.doPrivileged(Native Method)
> 	at javax.security.auth.Subject.doAs(Subject.java:422)
> 	at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1962)
> 	at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2675)
> {noformat}
> This isn't a very critical bug since it's an unusual rack configuration, but it can easily happen during testing.


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