Details
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Bug
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Status: Resolved
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Major
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Resolution: Fixed
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3.0.0-alpha1
Description
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:
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)
This isn't a very critical bug since it's an unusual rack configuration, but it can easily happen during testing.
Attachments
Attachments
Issue Links
- is related to
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HDFS-12725 BlockPlacementPolicyRackFaultTolerant fails with very uneven racks
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- Resolved
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