milleruntime opened a new pull request #2342:
URL: https://github.com/apache/accumulo/pull/2342
This PR creates an IT to expose a bug introduced in #1605. If a flush
doesn't produce any entries in `DataFileValue`, then a `StoredTabletFile` won't
be created, since nothing was inserted into the metadata, and the newFile
object will be null. Refactoring was done in `DatafileManager` to the
bringMinorCompactionOnline() method so that it now returns the newFile. But
this file could be null, if nothing was written to the metadata table. I am not
sure what should be done to fix this issue but I was at least was able to
reproduce it in an IT. This bug is particularly nasty since Accumulo thinks the
flush succeeds but the error will be thrown towards the end of the process and
the file never gets created.
Server error printed in tablet server log:
<pre>
2021-11-02T13:23:03,134 [tablet.MinorCompactionTask] ERROR: Unknown error
during minor compaction for extent: 1<<
java.lang.RuntimeException: Exception occurred during minor compaction on 1<<
at
org.apache.accumulo.tserver.tablet.Tablet.minorCompact(Tablet.java:820)
~[classes/:?]
at
org.apache.accumulo.tserver.tablet.MinorCompactionTask.run(MinorCompactionTask.java:99)
[classes/:?]
at
org.apache.htrace.wrappers.TraceRunnable.run(TraceRunnable.java:57)
[htrace-core-3.2.0-incubating.jar:3.2.0-incubating]
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1128)
[?:?]
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:628)
[?:?]
at java.lang.Thread.run(Thread.java:829) [?:?]
Caused by: java.lang.NullPointerException
at java.util.Objects.requireNonNull(Objects.java:221) ~[?:?]
at
java.util.ImmutableCollections$List12.<init>(ImmutableCollections.java:372)
~[?:?]
at java.util.List.of(List.java:807) ~[?:?]
at
org.apache.accumulo.tserver.tablet.Tablet.minorCompact(Tablet.java:814)
~[classes/:?]
... 5 more
</pre>
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