rdhabalia opened a new pull request #3127:
URL: https://github.com/apache/bookkeeper/pull/3127
### Motivation
When Bookie sanity and autoreovery use the same conf file which has flag
`reorderReadSequenceEnabled=true` then bookie-sanity command throws NPE as
`LocalBookieEnsemblePlacementPolicy::reorderReadLACSequence` returns null
writesets which causes the sanity failure.
```
00:46:46.202 [BookKeeperClientWorker-OrderedExecutor-11-0] ERROR
o.a.b.common.util.SafeRunnable - Unexpected throwable caught
java.lang.NullPointerException: null
at
org.apache.bookkeeper.client.PendingReadOp$SequenceReadRequest.sendNextRead(PendingReadOp.java:399)
at
org.apache.bookkeeper.client.PendingReadOp$SequenceReadRequest.read(PendingReadOp.java:385)
at
org.apache.bookkeeper.client.PendingReadOp.initiate(PendingReadOp.java:529)
at
org.apache.bookkeeper.client.LedgerRecoveryOp.doRecoveryRead(LedgerRecoveryOp.java:148)
at
org.apache.bookkeeper.client.LedgerRecoveryOp.access$000(LedgerRecoveryOp.java:37)
at
org.apache.bookkeeper.client.LedgerRecoveryOp$1.readLastConfirmedDataComplete(LedgerRecoveryOp.java:109)
at
org.apache.bookkeeper.client.ReadLastConfirmedOp.readEntryComplete(ReadLastConfirmedOp.java:135)
at
org.apache.bookkeeper.proto.PerChannelBookieClient$ReadCompletion$1.readEntryComplete(PerChannelBookieClient.java:1829)
at
org.apache.bookkeeper.proto.PerChannelBookieClient$ReadCompletion.handleReadResponse(PerChannelBookieClient.java:1910)
at
org.apache.bookkeeper.proto.PerChannelBookieClient$ReadCompletion.handleV3Response(PerChannelBookieClient.java:1885)
at
org.apache.bookkeeper.proto.PerChannelBookieClient$3.safeRun(PerChannelBookieClient.java:1446)
at
org.apache.bookkeeper.common.util.SafeRunnable.run(SafeRunnable.java:36)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at
io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
at java.lang.Thread.run(Thread.java:748)
```
### Modification
Fix NPE for local ensemble policy while reading entry with
`reorderReadSequenceEnabled` flag enabled.
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