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From "Jeff Jirsa (JIRA)" <>
Subject [jira] [Commented] (CASSANDRA-13696) Digest mismatch Exception if hints file has UnknownColumnFamily
Date Thu, 20 Jul 2017 15:39:00 GMT


Jeff Jirsa commented on CASSANDRA-13696:

Wanted to chat with Aleksey offline about the version implications, so withholding comment
on that for a bit, but:

might be it's better to just call resetCrc explicitly and still return null like I did here?
hint is a local variable, and setting it and carrying on makes the logic a bit harder to understand.
For example, for me it was non-obvious that this boolean method would also do some buffer
rewinding / state resetting under the hood.

I think the current behavior is actually the right thing to do. Simply resetting the CRC state
isn't enough, we need to check to see if the CRC matches, because we want to invoke the disk
failure policy if we're reading corrupt data, and frankly, a corruption source (bad disk /
RAM / etc) that flips bits could cause us to see an invalid CFID, and skipping the corruption
test at that point would be the wrong thing to do. A few more comment lines are probably worthwhile,
though, since it seems like an easy 'fix' to revert in the future because it's nonobvious.

> Digest mismatch Exception if hints file has UnknownColumnFamily
> ---------------------------------------------------------------
>                 Key: CASSANDRA-13696
>                 URL:
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jay Zhuang
>            Assignee: Jay Zhuang
>            Priority: Blocker
>             Fix For: 3.0.x, 3.11.x, 4.x
> {noformat}
> WARN  [HintsDispatcher:2] 2017-07-16 22:00:32,579 - Failed to read
a hint for / a2b7daf1-a6a4-4dfc-89de-32d12d2d48b0 - table with id 3882bbb0-6a71-11e7-9bca-2759083e3964
is unknown in file a2b7daf1-a6a4-4dfc-89de-32d12d2d48b0-1500242103097-1.hints
> ERROR [HintsDispatcher:2] 2017-07-16 22:00:32,580 - Failed
to dispatch hints file a2b7daf1-a6a4-4dfc-89de-32d12d2d48b0-1500242103097-1.hints: file is
corrupted ({})
> Digest mismatch exception
>     at org.apache.cassandra.hints.HintsReader$HintsIterator.computeNext(
>     at org.apache.cassandra.hints.HintsReader$HintsIterator.computeNext(
>     at org.apache.cassandra.utils.AbstractIterator.hasNext(
>     at org.apache.cassandra.hints.HintsDispatcher.sendHints(
>     at org.apache.cassandra.hints.HintsDispatcher.sendHintsAndAwait(
>     at org.apache.cassandra.hints.HintsDispatcher.dispatch(
>     at org.apache.cassandra.hints.HintsDispatcher.dispatch( ~[main/:na]
>     at org.apache.cassandra.hints.HintsDispatchExecutor$DispatchHintsTask.deliver(
>     at org.apache.cassandra.hints.HintsDispatchExecutor$DispatchHintsTask.dispatch(
>     at org.apache.cassandra.hints.HintsDispatchExecutor$DispatchHintsTask.dispatch(
>     at org.apache.cassandra.hints.HintsDispatchExecutor$
>     at java.util.concurrent.Executors$ [na:1.8.0_111]
>     at [na:1.8.0_111]
>     at java.util.concurrent.ThreadPoolExecutor.runWorker(
>     at java.util.concurrent.ThreadPoolExecutor$
>     at org.apache.cassandra.concurrent.NamedThreadFactory.lambda$threadLocalDeallocator$0(
>     at ~[na:1.8.0_111]
> Caused by: Digest mismatch exception
>     at org.apache.cassandra.hints.HintsReader$HintsIterator.computeNextInternal(
>     at org.apache.cassandra.hints.HintsReader$HintsIterator.computeNext(
>     ... 16 common frames omitted
> {noformat}
> It causes multiple cassandra nodes stop [by default|].
> Here is the reproduce steps on a 3 nodes cluster, RF=3:
> 1. stop node1
> 2. send some data with quorum (or one), it will generate hints file on node2/node3
> 3. drop the table
> 4. start node1
> node2/node3 will report "corrupted hints file" and stop. The impact is very bad for a
large cluster, when it happens, almost all the nodes are down at the same time and we have
to remove all the hints files (which contain the dropped table) to bring the node back.

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