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https://issues.apache.org/jira/browse/HDFS-776?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=13207092#comment-13207092
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Uma Maheswara Rao G commented on HDFS-776:
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Thanks a lot Nicholas, for the reviews!
> Fix exception handling in Balancer
> ----------------------------------
>
> Key: HDFS-776
> URL: https://issues.apache.org/jira/browse/HDFS-776
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: balancer
> Reporter: Owen O'Malley
> Assignee: Uma Maheswara Rao G
> Priority: Critical
> Fix For: 0.24.0, 0.23.2
>
> Attachments: HDFS-776.0.patch, HDFS-776.patch, HDFS-776.patch,
> HDFS-776.patch, HDFS-776.patch
>
>
> The Balancer's AccessKeyUpdater handles exceptions badly. In particular:
> 1. Catching Exception too low. The wrapper around setKeys should only catch
> IOException.
> 2. InterruptedException is ignored. It should be caught at the top level and
> exit run.
> 3. Throwable is not caught. It should be caught at the top level and kill the
> Balancer server process.
> {code}
> class AccessKeyUpdater implements Runnable {
> public void run() {
> while (shouldRun) {
> try {
> accessTokenHandler.setKeys(namenode.getAccessKeys());
> } catch (Exception e) {
> LOG.error(StringUtils.stringifyException(e));
> }
> try {
> Thread.sleep(keyUpdaterInterval);
> } catch (InterruptedException ie) {
> }
> }
> }
> }
> {code}
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