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https://issues.apache.org/jira/browse/HDFS-16518?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Owen O'Malley resolved HDFS-16518.
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Fix Version/s: 3.4.0
2.10.2
3.3.3
Resolution: Fixed
I committed this. Thanks, Lei!
> KeyProviderCache close cached KeyProvider with Hadoop ShutdownHookManager
> -------------------------------------------------------------------------
>
> Key: HDFS-16518
> URL: https://issues.apache.org/jira/browse/HDFS-16518
> Project: Hadoop HDFS
> Issue Type: Bug
> Components: hdfs
> Affects Versions: 2.10.0
> Reporter: Lei Yang
> Assignee: Lei Yang
> Priority: Major
> Labels: pull-request-available
> Fix For: 3.4.0, 2.10.2, 3.3.3
>
> Time Spent: 2h
> Remaining Estimate: 0h
>
> KeyProvider implements Closable interface but some custom implementation of
> KeyProvider also needs explicit close in KeyProviderCache. An example is to
> use custom KeyProvider in DFSClient to integrate read encrypted file on HDFS.
> KeyProvider currently gets closed in KeyProviderCache only when cache entry
> is expired or invalidated. In some cases, this is not happening. This seems
> related to guava cache.
> This patch is to use hadoop JVM shutdownhookManager to globally cleanup cache
> entries and thus close KeyProvider using cache hook right after filesystem
> instance gets closed in a deterministic way.
> {code:java}
> Class KeyProviderCache
> ...
> public KeyProviderCache(long expiryMs) {
> cache = CacheBuilder.newBuilder()
> .expireAfterAccess(expiryMs, TimeUnit.MILLISECONDS)
> .removalListener(new RemovalListener<URI, KeyProvider>() {
> @Override
> public void onRemoval(
> @Nonnull RemovalNotification<URI, KeyProvider> notification) {
> try {
> assert notification.getValue() != null;
> notification.getValue().close();
> } catch (Throwable e) {
> LOG.error(
> "Error closing KeyProvider with uri ["
> + notification.getKey() + "]", e);
> }
> }
> })
> .build();
> }{code}
> We could have made a new function KeyProviderCache#close, have each DFSClient
> call this function and close KeyProvider at the end of each DFSClient#close
> call but it will expose another problem to potentially close global cache
> among different DFSClient instances.
>
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