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doc-exports/docs/mrs/component-operation-guide/mrs_01_1792.html
Yang, Tong 6182f91ba8 MRS component operation guide_normal 2.0.38.SP20 version 
Reviewed-by: Hasko, Vladimir <vladimir.hasko@t-systems.com>
Co-authored-by: Yang, Tong <yangtong2@huawei.com>
Co-committed-by: Yang, Tong <yangtong2@huawei.com>
2022-12-09 14:55:21 +00:00

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Why Cannot HDFS_DELEGATION_TOKEN Be Found in the Cache?

Question

In security mode, why delegation token HDFS_DELEGATION_TOKEN is not found in the cache?

Answer

In MapReduce, by default HDFS_DELEGATION_TOKEN will be canceled after the job completion. So if the token has to be re- used for the next job then the token will not be found in the cache.

To re-use the same token in subsequent job set the below parameter for the MR job configuration. When it is false the user can re-sue the same token.

jobConf.setBoolean("mapreduce.job.complete.cancel.delegation.tokens", false);