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https://issues.apache.org/jira/browse/HDFS-10301?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=15518131#comment-15518131
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Vinitha Reddy Gankidi commented on HDFS-10301:
----------------------------------------------
i) When BRs are split into multiple RPCS: Say 2 BRs from the same DN are
processed at the same time. If we process the last storage report of the second
BR before processing all the storage reports in the first BR, then the
remaining storage reports in the first BR will be ignored as checkLease would
return false.
{code}
if (context != null) {
if (context.getTotalRpcs() == context.getCurRpc() + 1) {
long leaseId = this.getBlockReportLeaseManager().removeLease(node);
BlockManagerFaultInjector.getInstance().
removeBlockReportLease(node, leaseId);
}
{code}
ii) For single RPC BRs: As all storage reports in the single RPC BR satisfy the
condition that triggers removal of the lease, all storage reports after the
first storage report will be ignored without the change.
> BlockReport retransmissions may lead to storages falsely being declared
> zombie if storage report processing happens out of order
> --------------------------------------------------------------------------------------------------------------------------------
>
> Key: HDFS-10301
> URL: https://issues.apache.org/jira/browse/HDFS-10301
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: namenode
> Affects Versions: 2.6.1
> Reporter: Konstantin Shvachko
> Assignee: Vinitha Reddy Gankidi
> Priority: Critical
> Attachments: HDFS-10301.002.patch, HDFS-10301.003.patch,
> HDFS-10301.004.patch, HDFS-10301.005.patch, HDFS-10301.006.patch,
> HDFS-10301.007.patch, HDFS-10301.008.patch, HDFS-10301.009.patch,
> HDFS-10301.01.patch, HDFS-10301.010.patch, HDFS-10301.011.patch,
> HDFS-10301.012.patch, HDFS-10301.013.patch, HDFS-10301.014.patch,
> HDFS-10301.branch-2.7.patch, HDFS-10301.branch-2.patch,
> HDFS-10301.sample.patch, zombieStorageLogs.rtf
>
>
> When NameNode is busy a DataNode can timeout sending a block report. Then it
> sends the block report again. Then NameNode while process these two reports
> at the same time can interleave processing storages from different reports.
> This screws up the blockReportId field, which makes NameNode think that some
> storages are zombie. Replicas from zombie storages are immediately removed,
> causing missing blocks.
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