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https://issues.apache.org/jira/browse/HBASE-24403?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Guanghao Zhang reassigned HBASE-24403:
--------------------------------------
Assignee: wuchang
> FsDelegationToken should cache Token
> ------------------------------------
>
> Key: HBASE-24403
> URL: https://issues.apache.org/jira/browse/HBASE-24403
> Project: HBase
> Issue Type: Bug
> Reporter: wuchang
> Assignee: wuchang
> Priority: Major
> Attachments: 24403.patch
>
>
> When doing Bulkload, we find that FsDelegationToken will acquire token of
> NameNode everytime for a single file, although, from the comment of
> acquireDelegationToken(), it claims that it is trying to find token in cache
> firstly, but the newly requested token is never put to cache and thus the
> cache is still empty for the following request;
> In cases there are many files to do the bulk load, the token request will
> cause big short to NameNode.
>
> {code:java}
> public void acquireDelegationToken(final FileSystem fs)
> throws IOException {
> if (userProvider.isHadoopSecurityEnabled()) {
> this.fs = fs;
> userToken = userProvider.getCurrent().getToken("HDFS_DELEGATION_TOKEN",
> fs.getCanonicalServiceName());
> if (userToken == null) {
> hasForwardedToken = false;
> try {
> userToken = fs.getDelegationToken(renewer);
> } catch (NullPointerException npe) {
> // we need to handle NullPointerException in case HADOOP-10009 is missing
> LOG.error("Failed to get token for " + renewer);
> }
> } else {
> hasForwardedToken = true;
> LOG.info("Use the existing token: " + userToken);
> }
> }
> }{code}
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