hadoop garbage collection station

Keywords: Big Data Hadoop Java Apache xml

In production, the hdfs recycling bin must be open, usually set to 7 days.

fs.trash.interval reserves time for the garbage collection station, and disables the function of the collection station if it is 0.

The checkpoint time of fs.trash.checkpoint.interval recycling bin is generally set to be less than or equal to fs.trash.interval. If 0, the value is the same as fs.trash.interval.

fs.trash.interval	0	Number of minutes after which the checkpoint gets deleted. If zero, the trash feature is disabled. This option may be configured both on the server and the client. If trash is disabled server side then the client side configuration is checked. If trash is enabled on the server side then the value configured on the server is used and the client configuration value is ignored.
fs.trash.checkpoint.interval	0	Number of minutes between trash checkpoints. Should be smaller or equal to fs.trash.interval. If zero, the value is set to the value of fs.trash.interval. Every time the checkpointer runs it creates a new checkpoint out of current and removes checkpoints created more than fs.trash.interval minutes ago.

vi etc/hadoop/core-site.xml

<property>
     <name>fs.trash.interval</name>
     <value>1440</value>
</property>

<property>
     <name>fs.trash.checkpoint.interval</name>
     <value>0</value>
</property>

Restart hdfs,

[hadoop@hd1 ~]$ hdfs dfs -put hadoop.log  /
18/10/24 05:16:35 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
18/10/24 05:16:37 WARN hdfs.DFSClient: DataStreamer Exception
org.apache.hadoop.ipc.RemoteException(java.io.IOException): File /hadoop.log._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 0 datanode(s) running and no node(s) are excluded in this operation.
        at org.apache.hadoop.hdfs.server.blockmanagement.BlockManager.chooseTarget4NewBlock(BlockManager.java:1595)
        at org.apache.hadoop.hdfs.server.namenode.FSNamesystem.getAdditionalBlock(FSNamesystem.java:3287)
        at org.apache.hadoop.hdfs.server.namenode.NameNodeRpcServer.addBlock(NameNodeRpcServer.java:677)
        at org.apache.hadoop.hdfs.server.namenode.AuthorizationProviderProxyClientProtocol.addBlock(AuthorizationProviderProxyClientProtocol.java:213)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolServerSideTranslatorPB.addBlock(ClientNamenodeProtocolServerSideTranslatorPB.java:485)
        at org.apache.hadoop.hdfs.protocol.proto.ClientNamenodeProtocolProtos$ClientNamenodeProtocol$2.callBlockingMethod(ClientNamenodeProtocolProtos.java)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:617)
        at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:1073)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2086)
        at org.apache.hadoop.ipc.Server$Handler$1.run(Server.java:2082)
        at java.security.AccessController.doPrivileged(Native Method)
        at javax.security.auth.Subject.doAs(Subject.java:422)
        at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1693)
        at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2080)

        at org.apache.hadoop.ipc.Client.call(Client.java:1471)
        at org.apache.hadoop.ipc.Client.call(Client.java:1408)
        at org.apache.hadoop.ipc.ProtobufRpcEngine$Invoker.invoke(ProtobufRpcEngine.java:230)
        at com.sun.proxy.$Proxy9.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.protocolPB.ClientNamenodeProtocolTranslatorPB.addBlock(ClientNamenodeProtocolTranslatorPB.java:404)
        at sun.reflect.NativeMethodAccessorImpl.invoke0(Native Method)
        at sun.reflect.NativeMethodAccessorImpl.invoke(NativeMethodAccessorImpl.java:62)
        at sun.reflect.DelegatingMethodAccessorImpl.invoke(DelegatingMethodAccessorImpl.java:43)
        at java.lang.reflect.Method.invoke(Method.java:483)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invokeMethod(RetryInvocationHandler.java:256)
        at org.apache.hadoop.io.retry.RetryInvocationHandler.invoke(RetryInvocationHandler.java:104)
        at com.sun.proxy.$Proxy10.addBlock(Unknown Source)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.locateFollowingBlock(DFSOutputStream.java:1704)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.nextBlockOutputStream(DFSOutputStream.java:1500)
        at org.apache.hadoop.hdfs.DFSOutputStream$DataStreamer.run(DFSOutputStream.java:668)
put: File /hadoop.log._COPYING_ could only be replicated to 0 nodes instead of minReplication (=1).  There are 0 datanode(s) running and no node(s) are excluded in this operation.

Is the number of copies set wrong, check the next hdfs-site.xml did not find a problem, DN hang, jps view is normal, whether the NN can not find DN, check the next firewall, as a matter of fact, the firewall is not closed, turn off OK.

[hadoop@hd1 ~]$ hdfs dfs -rm  /hadoop.log
18/10/24 07:19:03 WARN util.NativeCodeLoader: Unable to load native-hadoop library for your platform... using builtin-java classes where applicable
18/10/24 07:19:05 INFO fs.TrashPolicyDefault: Moved: 'hdfs://hd1:9000/hadoop.log' to trash at: hdfs://hd1:9000/user/hadoop/.Trash/Current/hadoop.log

We can see that rm deletes files but is moved to another directory by mv, Moved:'hdfs://hd1:9000/hadoop.log'to trash at: hdfs://hd1:9000/user/hadoop/.Trash/Current/hadoop.log.

Posted by NJordan72 on Fri, 25 Jan 2019 14:51:13 -0800

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hadoop garbage collection station

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