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Yanlei Yu edited comment on HDFS-17093 at 7/19/23 6:08 AM: ----------------------------------------------------------- Just to add to that,Our cluster configuration is dfs.namenode.max.full.block.report.leases=1500(we have 800+ nodes),When the namenode restarts, all 800+ nodes will send FBRS,This happens when the namenode is under a lot of pressure,Of course will not rule out dfs.namenode.max.full.block.report.leases Set to a smaller value,not sure it will happen was (Author: JIRAUSER294151): Just to add to that,Our cluster configuration is dfs.namenode.max.full.block.report.leases=1500(we have 800+ nodes),When the namenode restarts, all 800+ nodes will send FBRS,This happens when the namenode is under a lot of pressure,Of course will not rule out dfs.namenode.max.full.block.report.leases Set to a smaller value,will not happen > In the case of all datanodes sending FBR when the namenode restarts (large > clusters), there is an issue with incomplete block reporting > --------------------------------------------------------------------------------------------------------------------------------------- > > Key: HDFS-17093 > URL: https://issues.apache.org/jira/browse/HDFS-17093 > Project: Hadoop HDFS > Issue Type: Bug > Components: namenode > Affects Versions: 3.3.4 > Reporter: Yanlei Yu > Priority: Minor > Attachments: HDFS-17093.patch > > > In our cluster of 800+ nodes, after restarting the namenode, we found that > some datanodes did not report enough blocks, causing the namenode to stay in > secure mode for a long time after restarting because of incomplete block > reporting > I found in the logs of the datanode with incomplete block reporting that the > first FBR attempt failed, possibly due to namenode stress, and then a second > FBR attempt was made as follows: > {code:java} > .... > 2023-07-17 11:29:28,982 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: > Unsuccessfully sent block report 0x6237a52c1e817e, containing 12 storage > report(s), of which we sent 1. The reports had 1099057 total blocks and used > 1 RPC(s). This took 294 msec to generate and 101721 msecs for RPC and NN > processing. Got back no commands. > 2023-07-17 11:37:04,014 INFO org.apache.hadoop.hdfs.server.datanode.DataNode: > Successfully sent block report 0x62382416f3f055, containing 12 storage > report(s), of which we sent 12. The reports had 1099048 total blocks and used > 12 RPC(s). This took 295 msec to generate and 11647 msecs for RPC and NN > processing. Got back no commands. {code} > There's nothing wrong with that. Retry the send if it fails But on the > namenode side of the logic: > {code:java} > if (namesystem.isInStartupSafeMode() > && !StorageType.PROVIDED.equals(storageInfo.getStorageType()) > && storageInfo.getBlockReportCount() > 0) { > blockLog.info("BLOCK* processReport 0x{} with lease ID 0x{}: " > + "discarded non-initial block report from {}" > + " because namenode still in startup phase", > strBlockReportId, fullBrLeaseId, nodeID); > blockReportLeaseManager.removeLease(node); > return !node.hasStaleStorages(); > } {code} > When a disk was identified as the report is not the first time, namely > storageInfo. GetBlockReportCount > 0, Will remove the ticket from the > datanode, lead to a second report failed because no lease -- This message was sent by Atlassian Jira (v8.20.10#820010) --------------------------------------------------------------------- To unsubscribe, e-mail: hdfs-issues-unsubscr...@hadoop.apache.org For additional commands, e-mail: hdfs-issues-h...@hadoop.apache.org