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https://issues.apache.org/jira/browse/HDFS-8574?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Ajith S resolved HDFS-8574.
---------------------------
Resolution: Not A Problem
> When block count for a volume exceeds dfs.blockreport.split.threshold, block
> report causes exception
> ----------------------------------------------------------------------------------------------------
>
> Key: HDFS-8574
> URL: https://issues.apache.org/jira/browse/HDFS-8574
> Project: Hadoop HDFS
> Issue Type: Bug
> Affects Versions: 2.7.0
> Reporter: Ajith S
> Assignee: Ajith S
>
> This piece of code in
> {{org.apache.hadoop.hdfs.server.datanode.BPServiceActor.blockReport()}}
> {code}
> // Send one block report per message.
> for (int r = 0; r < reports.length; r++) {
> StorageBlockReport singleReport[] = { reports[r] };
> DatanodeCommand cmd = bpNamenode.blockReport(
> bpRegistration, bpos.getBlockPoolId(), singleReport,
> new BlockReportContext(reports.length, r, reportId));
> numReportsSent++;
> numRPCs++;
> if (cmd != null) {
> cmds.add(cmd);
> }
> {code}
> when a single volume contains many blocks, i.e more than the threshold, it is
> trying to send the entire blockreport in one RPC, causing exception
> {code}
> java.lang.IllegalStateException:
> com.google.protobuf.InvalidProtocolBufferException: Protocol message was too
> large. May be malicious. Use CodedInputStream.setSizeLimit() to increase
> the size limit.
> at
> org.apache.hadoop.hdfs.protocol.BlockListAsLongs$BufferDecoder$1.next(BlockListAsLongs.java:369)
> at
> org.apache.hadoop.hdfs.protocol.BlockListAsLongs$BufferDecoder$1.next(BlockListAsLongs.java:347)
> at
> org.apache.hadoop.hdfs.protocol.BlockListAsLongs$BufferDecoder.getBlockListAsLongs(BlockListAsLongs.java:325)
> at
> org.apache.hadoop.hdfs.protocolPB.DatanodeProtocolClientSideTranslatorPB.blockReport(DatanodeProtocolClientSideTranslatorPB.java:190)
> at
> org.apache.hadoop.hdfs.server.datanode.BPServiceActor.blockReport(BPServiceActor.java:473)
> {code}
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