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https://issues.apache.org/jira/browse/HBASE-20244?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=16530756#comment-16530756
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Sean Busbey commented on HBASE-20244:
-------------------------------------

Please include a note in the Hadoop section of the ref guide calling out that 
users of Hadoop versions with the causes of these breakages will need to change 
their WAL provider to {{filesystem}}.

> NoSuchMethodException when retrieving private method 
> decryptEncryptedDataEncryptionKey from DFSClient
> -----------------------------------------------------------------------------------------------------
>
>                 Key: HBASE-20244
>                 URL: https://issues.apache.org/jira/browse/HBASE-20244
>             Project: HBase
>          Issue Type: Sub-task
>          Components: wal
>    Affects Versions: 2.0.0, 2.0.1
>            Reporter: Ted Yu
>            Assignee: Ted Yu
>            Priority: Blocker
>             Fix For: 3.0.0, 2.1.0, 2.0.2, 2.2.0
>
>         Attachments: 20244.v1.txt, 20244.v1.txt, 20244.v1.txt
>
>
> I was running unit test against hadoop 3.0.1 RC and saw the following in test 
> output:
> {code}
> ERROR [RS-EventLoopGroup-3-3] 
> asyncfs.FanOutOneBlockAsyncDFSOutputSaslHelper(267): Couldn't properly 
> initialize access to HDFS internals. Please update  your WAL Provider to not 
> make use of the 'asyncfs' provider. See HBASE-16110 for more information.
> java.lang.NoSuchMethodException: 
> org.apache.hadoop.hdfs.DFSClient.decryptEncryptedDataEncryptionKey(org.apache.hadoop.fs.FileEncryptionInfo)
>   at java.lang.Class.getDeclaredMethod(Class.java:2130)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputSaslHelper.createTransparentCryptoHelper(FanOutOneBlockAsyncDFSOutputSaslHelper.java:232)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputSaslHelper.<clinit>(FanOutOneBlockAsyncDFSOutputSaslHelper.java:262)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper.initialize(FanOutOneBlockAsyncDFSOutputHelper.java:661)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper.access$300(FanOutOneBlockAsyncDFSOutputHelper.java:118)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper$13.operationComplete(FanOutOneBlockAsyncDFSOutputHelper.java:720)
>   at 
> org.apache.hadoop.hbase.io.asyncfs.FanOutOneBlockAsyncDFSOutputHelper$13.operationComplete(FanOutOneBlockAsyncDFSOutputHelper.java:715)
>   at 
> org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListener0(DefaultPromise.java:507)
>   at 
> org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListeners0(DefaultPromise.java:500)
>   at 
> org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListenersNow(DefaultPromise.java:479)
>   at 
> org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.notifyListeners(DefaultPromise.java:420)
>   at 
> org.apache.hbase.thirdparty.io.netty.util.concurrent.DefaultPromise.trySuccess(DefaultPromise.java:104)
>   at 
> org.apache.hbase.thirdparty.io.netty.channel.DefaultChannelPromise.trySuccess(DefaultChannelPromise.java:82)
>   at 
> org.apache.hbase.thirdparty.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.fulfillConnectPromise(AbstractNioChannel.java:306)
>   at 
> org.apache.hbase.thirdparty.io.netty.channel.nio.AbstractNioChannel$AbstractNioUnsafe.finishConnect(AbstractNioChannel.java:341)
>   at 
> org.apache.hbase.thirdparty.io.netty.channel.nio.NioEventLoop.processSelectedKey(NioEventLoop.java:633)
>   at 
> org.apache.hbase.thirdparty.io.netty.channel.nio.NioEventLoop.processSelectedKeysOptimized(NioEventLoop.java:580)
> {code}
> The private method was moved by HDFS-12574 to HdfsKMSUtil with different 
> signature.
> To accommodate the above method movement, it seems we need to call the 
> following method of DFSClient :
> {code}
>   public KeyProvider getKeyProvider() throws IOException {
> {code}
> Since the new decryptEncryptedDataEncryptionKey method has this signature:
> {code}
>   static KeyVersion decryptEncryptedDataEncryptionKey(FileEncryptionInfo
>         feInfo, KeyProvider keyProvider) throws IOException {
> {code}



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