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Posted to hdfs-issues@hadoop.apache.org by "dark_num (Jira)" <ji...@apache.org> on 2020/03/24 07:26:00 UTC
[jira] [Comment Edited] (HDFS-14429) Block remain in COMMITTED but
not COMPLETE caused by Decommission
[ https://issues.apache.org/jira/browse/HDFS-14429?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17065375#comment-17065375 ]
dark_num edited comment on HDFS-14429 at 3/24/20, 7:25 AM:
-----------------------------------------------------------
{code:java}
// Why not use this method to judge the replica state
// It also include the "MAINTENANCE" case, avoid wrong calculation
if (result == AddBlockResult.ADDED) {
curReplicaDelta = (node.isInService()) ? 0 : 1;
//...
}
{code}
Thank you for your efforts and look forward to your reply,
was (Author: dark_num):
{code:java}
// Why not use this method to judge the replica state
// It also include the "MAINTENANCE" case, avoid wrong calculation
if (result == AddBlockResult.ADDED) {
curReplicaDelta = (node.isInService()) ? 0 : 1;
//...
}
Thank you for your efforts and look forward to your reply
{code}
> Block remain in COMMITTED but not COMPLETE caused by Decommission
> -----------------------------------------------------------------
>
> Key: HDFS-14429
> URL: https://issues.apache.org/jira/browse/HDFS-14429
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.9.2
> Reporter: Yicong Cai
> Assignee: Yicong Cai
> Priority: Major
> Fix For: 2.10.0, 3.3.0, 3.2.1, 2.9.3, 3.1.3
>
> Attachments: HDFS-14429.01.patch, HDFS-14429.02.patch, HDFS-14429.03.patch, HDFS-14429.branch-2.01.patch, HDFS-14429.branch-2.02.patch
>
>
> In the following scenario, the Block will remain in the COMMITTED but not COMPLETE state and cannot be closed properly:
> # Client writes Block(bk1) to three data nodes (dn1/dn2/dn3).
> # bk1 has been completely written to three data nodes, and the data node succeeds FinalizeBlock, joins IBR and waits to report to NameNode.
> # The client commits bk1 after receiving the ACK.
> # When the DN has not been reported to the IBR, all three nodes dn1/dn2/dn3 enter Decommissioning.
> # The DN reports the IBR, but the block cannot be completed normally.
>
> Then it will lead to the following related exceptions:
> {panel:title=Exception}
> 2019-04-02 13:40:31,882 INFO namenode.FSNamesystem (FSNamesystem.java:checkBlocksComplete(2790)) - BLOCK* blk_4313483521_3245321090 is COMMITTED but not COMPLETE(numNodes= 3 >= minimum = 1) in file xxx
> 2019-04-02 13:40:31,882 INFO ipc.Server (Server.java:logException(2650)) - IPC Server handler 499 on 8020, call Call#122552 Retry#0 org.apache.hadoop.hdfs.protocol.ClientProtocol.addBlock from xxx:47615
> org.apache.hadoop.hdfs.server.namenode.NotReplicatedYetException: Not replicated yet: xxx
> at org.apache.hadoop.hdfs.server.namenode.FSDirWriteFileOp.validateAddBlock(FSDirWriteFileOp.java:171)
> at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:2579)
> at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:846)
> at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:510)
> at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
> at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:503)
> at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:989)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:871)
> at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:817)
> at java.security.AccessController.doPrivileged(Native Method)
> at javax.security.auth.Subject.doAs(Subject.java:415)
> at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1893)
> at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2606)
> {panel}
> And will cause the scenario described in HDFS-12747
> The root cause is that addStoredBlock does not consider the case where the replications are in Decommission.
> This problem needs to be fixed like HDFS-11499.
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