szetszwo commented on PR #1215:
URL: https://github.com/apache/ratis/pull/1215#issuecomment-2616588708
It could throw IllegalStateException. Then, the ref is retained but not
released.
```
java.lang.IllegalStateException: index0: expected == 2 but computed == 0
at org.apache.ratis.util.Preconditions.assertTrue(Preconditions.java:77)
at org.apache.ratis.util.Preconditions.assertSame(Preconditions.java:87)
at
org.apache.ratis.server.impl.ServerImplUtils$NavigableIndices.append(ServerImplUtils.java:145)
at
org.apache.ratis.server.impl.RaftServerImpl.appendLog(RaftServerImpl.java:1695)
at
org.apache.ratis.server.impl.RaftServerImpl.appendEntriesAsync(RaftServerImpl.java:1660)
at
org.apache.ratis.server.impl.RaftServerImpl.appendEntriesAsync(RaftServerImpl.java:1547)
at
org.apache.ratis.server.impl.RaftServerProxy.lambda$null$28(RaftServerProxy.java:656)
at org.apache.ratis.util.JavaUtils.callAsUnchecked(JavaUtils.java:118)
at
org.apache.ratis.server.impl.RaftServerImpl.lambda$executeSubmitServerRequestAsync$10(RaftServerImpl.java:936)
at
java.util.concurrent.CompletableFuture$AsyncSupply.run(CompletableFuture.java:1604)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1149)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:624)
at java.lang.Thread.run(Thread.java:750)
```
There seems to have two async calls, appendEntries1 and then appendEntries2.
The failure happens when appendEntries2 runs faster than appendEntries1.
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