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https://issues.apache.org/jira/browse/HDFS-15113?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Xiaoqiao He updated HDFS-15113:
-------------------------------
Attachment: HDFS-15113.004.patch
> Missing IBR when NameNode restart if open processCommand async feature
> ----------------------------------------------------------------------
>
> Key: HDFS-15113
> URL: https://issues.apache.org/jira/browse/HDFS-15113
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: datanode
> Reporter: Xiaoqiao He
> Assignee: Xiaoqiao He
> Priority: Blocker
> Attachments: HDFS-15113.001.patch, HDFS-15113.002.patch,
> HDFS-15113.003.patch, HDFS-15113.004.patch
>
>
> Recently, I meet one case that NameNode missing block after restart which is
> related with HDFS-14997.
> a. during NameNode restart, it will return command `DNA_REGISTER` to DataNode
> when receive some RPC request from DataNode.
> b. when DataNode receive `DNA_REGISTER` command, it will run #reRegister
> async.
> {code:java}
> void reRegister() throws IOException {
> if (shouldRun()) {
> // re-retrieve namespace info to make sure that, if the NN
> // was restarted, we still match its version (HDFS-2120)
> NamespaceInfo nsInfo = retrieveNamespaceInfo();
> // and re-register
> register(nsInfo);
> scheduler.scheduleHeartbeat();
> // HDFS-9917,Standby NN IBR can be very huge if standby namenode is down
> // for sometime.
> if (state == HAServiceState.STANDBY || state ==
> HAServiceState.OBSERVER) {
> ibrManager.clearIBRs();
> }
> }
> }
> {code}
> c. As we know, #register will trigger BR immediately.
> d. because #reRegister run async, so we could not make sure which one run
> first between send FBR and clear IBR. If clean IBR run first, it will be OK.
> But if send FBR first then clear IBR, it will missing some blocks received
> between these two time point until next FBR.
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