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It is possible to store queue meta table without metadata section

See original GitHub issue

If metadata is absent, it will be read as NoMeta, which is not permitted:

java.lang.IllegalStateException: Expected SCQMeta, got class net.openhft.chronicle.queue.impl.table.Metadata$NoMeta
	at net.openhft.chronicle.queue.impl.single.SCQMeta.overrideFrom(SCQMeta.java:73)
	at net.openhft.chronicle.queue.impl.table.SingleTableBuilder.readTableStore(SingleTableBuilder.java:165)
	at net.openhft.chronicle.queue.impl.table.SingleTableBuilder.lambda$build$2(SingleTableBuilder.java:142)
	at net.openhft.chronicle.queue.impl.table.SingleTableStore.doWithLock(SingleTableStore.java:141)
	at net.openhft.chronicle.queue.impl.table.SingleTableStore.doWithExclusiveLock(SingleTableStore.java:124)
	at net.openhft.chronicle.queue.impl.table.SingleTableBuilder.build(SingleTableBuilder.java:137)
	at net.openhft.chronicle.queue.impl.single.SingleChronicleQueueBuilder.initializeMetadata(SingleChronicleQueueBuilder.java:450)
	at net.openhft.chronicle.queue.impl.single.SingleChronicleQueueBuilder.preBuild(SingleChronicleQueueBuilder.java:1089)
	at net.openhft.chronicle.queue.impl.single.SingleChronicleQueueBuilder.build(SingleChronicleQueueBuilder.java:326)
	at net.openhft.chronicle.queue.impl.TableStoreTest.preCreateQueueMeta(TableStoreTest.java:111)

But turns out you can still write such table, just not read it.

Issue Analytics

State:
Created a year ago
Comments:5 (5 by maintainers)

Top GitHub Comments

1reaction

alamarcommented, Oct 20, 2022

@peter-lawrey what do you think about that? Should we ignore and overwrite (absent) NoMeta with SCQMeta when it is written into Queue’s table store by some external process?

0reactions

alamarcommented, Nov 14, 2022

It seems that it is currently unfeasible. If the queue meta table file was created with incorrect metadata section, it needs to be recreated in offline mode.

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