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https://issues.apache.org/jira/browse/CASSANDRA-19471?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17828364#comment-17828364
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Branimir Lambov edited comment on CASSANDRA-19471 at 3/19/24 2:43 PM:
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I believe the problem is that the buffer's limit (set
[here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java#L208])
is not the same as the buffer's capacity (from which {{endOfBuffer}} is set
[here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java#L177]).
I guess what we want is to change the former to set the limit first and then
apply {{{}slice{}}}. We probably also want the aligning path above it to go
through this slicing to set the capacity appropriately. I'd also change the
assertions that follow to make sure the limit and capacity of the prepared
buffer match, and are equal to the segment size.
was (Author: blambov):
I believe the problem is that the buffer's limit (set
[here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/DirectIOSegment.java#L208])
is not the same as the buffer's capacity (from which `endOfBuffer` is set
[here|https://github.com/apache/cassandra/blob/trunk/src/java/org/apache/cassandra/db/commitlog/CommitLogSegment.java#L177]).
I guess what we want is to change the former to set the limit first and then
apply `slice`.
> Commitlog with direct io fails test_change_durable_writes
> ---------------------------------------------------------
>
> Key: CASSANDRA-19471
> URL: https://issues.apache.org/jira/browse/CASSANDRA-19471
> Project: Cassandra
> Issue Type: Bug
> Components: Local/Commit Log
> Reporter: Brandon Williams
> Priority: Normal
> Fix For: 5.0-rc, 5.x
>
>
> With the commitlog_disk_access_mode set to direct, and the improved
> configuration_test.py::TestConfiguration::test_change_durable_writes from
> CASSANDRA-19465, this fails with either:
> {noformat}
> AssertionError: Commitlog was written with durable writes disabled
> {noformat}
> Or what appears to be the original exception reported in CASSANDRA-19465:
> {noformat}
> node1: ERROR [PERIODIC-COMMIT-LOG-SYNCER] 2024-03-14 17:16:08,465
> StorageService.java:631 - Stopping native transport
> node1: ERROR [MutationStage-5] 2024-03-14 17:16:08,465
> StorageProxy.java:1670 - Failed to apply mutation locally :
> java.lang.IllegalArgumentException: newPosition > limit: (1048634 > 1048576)
> at java.base/java.nio.Buffer.createPositionException(Buffer.java:341)
> at java.base/java.nio.Buffer.position(Buffer.java:316)
> at java.base/java.nio.ByteBuffer.position(ByteBuffer.java:1516)
> at
> java.base/java.nio.MappedByteBuffer.position(MappedByteBuffer.java:321)
> at
> java.base/java.nio.MappedByteBuffer.position(MappedByteBuffer.java:73)
> at
> org.apache.cassandra.db.commitlog.CommitLogSegment.allocate(CommitLogSegment.java:216)
> at
> org.apache.cassandra.db.commitlog.CommitLogSegmentManagerStandard.allocate(CommitLogSegmentManagerStandard.java:52)
> at org.apache.cassandra.db.commitlog.CommitLog.add(CommitLog.java:307)
> at
> org.apache.cassandra.db.CassandraKeyspaceWriteHandler.addToCommitLog(CassandraKeyspaceWriteHandler.java:99)
> at
> org.apache.cassandra.db.CassandraKeyspaceWriteHandler.beginWrite(CassandraKeyspaceWriteHandler.java:53)
> at org.apache.cassandra.db.Keyspace.applyInternal(Keyspace.java:612)
> at org.apache.cassandra.db.Keyspace.apply(Keyspace.java:497)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:244)
> at org.apache.cassandra.db.Mutation.apply(Mutation.java:264)
> at
> org.apache.cassandra.service.StorageProxy$4.runMayThrow(StorageProxy.java:1664)
> at
> org.apache.cassandra.service.StorageProxy$LocalMutationRunnable.run(StorageProxy.java:2624)
> at
> org.apache.cassandra.concurrent.ExecutionFailure$2.run(ExecutionFailure.java:163)
> at org.apache.cassandra.concurrent.SEPWorker.run(SEPWorker.java:143)
> at
> io.netty.util.concurrent.FastThreadLocalRunnable.run(FastThreadLocalRunnable.java:30)
> at java.base/java.lang.Thread.run(Thread.java:833)
> node1: ERROR [PERIODIC-COMMIT-LOG-SYNCER] 2024-03-14 17:16:08,470
> StorageService.java:636 - Stopping gossiper
> {noformat}
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