[jira] [Created] (HDFS-11913) Ozone: TestKeySpaceManager#testDeleteVolume fails

["Weiwei Yang (JIRA)" <ji...@apache.org>]

Weiwei Yang created HDFS-11913:
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             Summary: Ozone: TestKeySpaceManager#testDeleteVolume fails
                 Key: HDFS-11913
                 URL: https://issues.apache.org/jira/browse/HDFS-11913
             Project: Hadoop HDFS
          Issue Type: Bug
          Components: ozone
            Reporter: Weiwei Yang
            Assignee: Weiwei Yang


HDFS-11774 introduces an UT failure, {{TestKeySpaceManager#testDeleteVolume}}, error as below

{noformat}
java.util.NoSuchElementException
 at org.fusesource.leveldbjni.internal.JniDBIterator.peekNext(JniDBIterator.java:84)
 at org.fusesource.leveldbjni.internal.JniDBIterator.next(JniDBIterator.java:98)
 at org.fusesource.leveldbjni.internal.JniDBIterator.next(JniDBIterator.java:45)
 at org.apache.hadoop.ozone.ksm.MetadataManagerImpl.isVolumeEmpty(MetadataManagerImpl.java:221)
 at org.apache.hadoop.ozone.ksm.VolumeManagerImpl.deleteVolume(VolumeManagerImpl.java:294)
 at org.apache.hadoop.ozone.ksm.KeySpaceManager.deleteVolume(KeySpaceManager.java:340)
 at org.apache.hadoop.ozone.protocolPB.KeySpaceManagerProtocolServerSideTranslatorPB.deleteVolume(KeySpaceManagerProtocolServerSideTranslatorPB.java:200)
 at org.apache.hadoop.ozone.protocol.proto.KeySpaceManagerProtocolProtos$KeySpaceManagerService$2.callBlockingMethod(KeySpaceManagerProtocolProtos.java:22742)
 at org.apache.hadoop.ipc.ProtobufRpcEngine$Server$ProtoBufRpcInvoker.call(ProtobufRpcEngine.java:522)
 at org.apache.hadoop.ipc.RPC$Server.call(RPC.java:991)
 at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:867)
 at org.apache.hadoop.ipc.Server$RpcCall.run(Server.java:813)
 at java.security.AccessController.doPrivileged(Native Method)
 at javax.security.auth.Subject.doAs(Subject.java:422)
 at org.apache.hadoop.security.UserGroupInformation.doAs(UserGroupInformation.java:1965)
 at org.apache.hadoop.ipc.Server$Handler.run(Server.java:2659)
{noformat}

this is caused by a buggy code in {{MetadataManagerImpl#isVolumeEmpty}}, there are 2 issues need to be fixed
# Iterate next element will throw this exception if it doesn't have next. This always fail when a volume is empty.
# The code was checking if the first bucket name start with "/volume_name", this will return a wrong value if I have several empty volumes with same prefix, e.g "/volA/", "/volAA/". Such case {{isVolumeEmpty}} will return false as the next element from "/volA/" is not a bucket, it's another volume "/volAA/" but matches the prefix.



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