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https://issues.apache.org/jira/browse/HDFS-12619?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Wei-Chiu Chuang updated HDFS-12619:
-----------------------------------
Attachment: HDFS-12619.001.patch
Attach a trivial patch to improve the error handling.
> Do not catch and throw unchecked exceptions if IBRs fail to process
> -------------------------------------------------------------------
>
> Key: HDFS-12619
> URL: https://issues.apache.org/jira/browse/HDFS-12619
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: namenode
> Affects Versions: 2.8.0, 2.7.3, 3.0.0-alpha1
> Reporter: Wei-Chiu Chuang
> Assignee: Wei-Chiu Chuang
> Priority: Minor
> Attachments: HDFS-12619.001.patch
>
>
> HDFS-9198 added the following code
> {code:title=BlockManager#processIncrementalBlockReport}
> public void processIncrementalBlockReport(final DatanodeID nodeID,
> final StorageReceivedDeletedBlocks srdb) throws IOException {
> assert namesystem.hasWriteLock();
> final DatanodeDescriptor node = datanodeManager.getDatanode(nodeID);
> if (node == null || !node.isRegistered()) {
> blockLog.warn("BLOCK* processIncrementalBlockReport"
> + " is received from dead or unregistered node {}", nodeID);
> throw new IOException(
> "Got incremental block report from unregistered or dead node");
> }
> try {
> processIncrementalBlockReport(node, srdb);
> } catch (Exception ex) {
> node.setForceRegistration(true);
> throw ex;
> }
> }
> {code}
> In Apache Hadoop 2.7.x ~ 3.0, the code snippet is accepted by Java compiler.
> However, when I attempted to backport it to a CDH5.3 release (based on Apache
> Hadoop 2.5.0), the compiler complains the exception is unhandled, because the
> method defines it throws IOException instead of Exception.
> While the code compiles for Apache Hadoop 2.7.x ~ 3.0, I feel it is not a
> good practice to catch an unchecked exception and then rethrow it. How about
> rewriting it with a finally block and a conditional variable?
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