[jira] [Created] (HDFS-17195) NullPointerException thrown in DataXceiver when `dfs.encrypt.data.overwrite.downstream.derived.qop` is true

["ConfX (Jira)" <ji...@apache.org>]

ConfX created HDFS-17195:
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             Summary: NullPointerException thrown in DataXceiver when `dfs.encrypt.data.overwrite.downstream.derived.qop` is true
                 Key: HDFS-17195
                 URL: https://issues.apache.org/jira/browse/HDFS-17195
             Project: Hadoop HDFS
          Issue Type: Bug
    Affects Versions: 3.3.6
            Reporter: ConfX


When `dfs.encrypt.data.overwrite.downstream.derived.qop` is true, `org.apache.hadoop.hdfs.server.datanode.DataXceiver#writeBlock` crashes with NullPointerException. This is because when the configuration is true, the block key is being obtained from a `datanode.blockPoolTokenSecretManager` that could still be null.

To reproduce:
1. set `dfs.encrypt.data.overwrite.downstream.derived.qop` to true
2. run `org.apache.hadoop.hdfs.server.datanode.TestDataXceiverBackwardsCompat#testBackwardsCompat`

We created a PR that provides a fix by making sure the blockPoolTokenSecretManager is not null while `dfs.encrypt.data.overwrite.downstream.derived.qop` is true.



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