[
https://issues.apache.org/jira/browse/RATIS-2350?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]
Tsz-wo Sze updated RATIS-2350:
------------------------------
Description:
There are bugs in handling readAfterWrite requests:
# In LeaderStateImpl.getReadIndex(..), it should use the max of
readAfterWriteConsistentIndex and commitIndex
# In WriteIndexCache.add(..), it should combine the current future with
previous future when the previous future exists.
Improvement:
- Add lastAppliedIndex to ReadIndexQueue
- Replace Consumer<Long> with LongConsumer
Bug in tests:
- In LinearizableReadTests.runTestReadAfterWrite(..), it tries to assert the
following:
bq. Assertion: _read-after-write is more consistent than linearizable read_
Recall the definitions:
bq. read-after-write: Within the same client, the read called after write must
able to see the change of the write
bq. linearizable read: the read is linearizable (i.e. it won't read stale data)
Suppose readIndex is 9 and writeIndex is 10. By definition read-after-write
must return any state at log index A after 10 while linearizable read must
return any state at log index L after 9. The assertion incorrectly check if A
>= L, which is not a requirement.
-----
Original Summary: TestReadOnlyRequestWithGrpc may fail intermittently
Original Description:
{code}
org.apache.ratis.grpc.TestReadOnlyRequestWithGrpc.testReadAfterWrite -- Time
elapsed: 1.572 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
at
org.apache.ratis.ReadOnlyRequestTests.testReadAfterWriteImpl(ReadOnlyRequestTests.java:314)
at
org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:143)
at
org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:121)
at
org.apache.ratis.ReadOnlyRequestTests.testReadAfterWrite(ReadOnlyRequestTests.java:289)
{code}
It failed 8 in [this 10x10
run|https://github.com/apache/ratis/actions/runs/19023405871/job/54322726144].
was:
{code}
org.apache.ratis.grpc.TestReadOnlyRequestWithGrpc.testReadAfterWrite -- Time
elapsed: 1.572 s <<< FAILURE!
org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
at
org.apache.ratis.ReadOnlyRequestTests.testReadAfterWriteImpl(ReadOnlyRequestTests.java:314)
at
org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:143)
at
org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:121)
at
org.apache.ratis.ReadOnlyRequestTests.testReadAfterWrite(ReadOnlyRequestTests.java:289)
{code}
It failed 8 in [this 10x10
run|https://github.com/apache/ratis/actions/runs/19023405871/job/54322726144].
Summary: Fix readAfterWrite bugs (was: TestReadOnlyRequestWithGrpc may
fail intermittently)
> Fix readAfterWrite bugs
> -----------------------
>
> Key: RATIS-2350
> URL: https://issues.apache.org/jira/browse/RATIS-2350
> Project: Ratis
> Issue Type: Bug
> Components: gRPC
> Reporter: Tsz-wo Sze
> Assignee: Tsz-wo Sze
> Priority: Major
>
> There are bugs in handling readAfterWrite requests:
> # In LeaderStateImpl.getReadIndex(..), it should use the max of
> readAfterWriteConsistentIndex and commitIndex
> # In WriteIndexCache.add(..), it should combine the current future with
> previous future when the previous future exists.
> Improvement:
> - Add lastAppliedIndex to ReadIndexQueue
> - Replace Consumer<Long> with LongConsumer
> Bug in tests:
> - In LinearizableReadTests.runTestReadAfterWrite(..), it tries to assert the
> following:
> bq. Assertion: _read-after-write is more consistent than linearizable read_
> Recall the definitions:
> bq. read-after-write: Within the same client, the read called after write
> must able to see the change of the write
> bq. linearizable read: the read is linearizable (i.e. it won't read stale
> data)
> Suppose readIndex is 9 and writeIndex is 10. By definition read-after-write
> must return any state at log index A after 10 while linearizable read must
> return any state at log index L after 9. The assertion incorrectly check if
> A >= L, which is not a requirement.
> -----
> Original Summary: TestReadOnlyRequestWithGrpc may fail intermittently
> Original Description:
> {code}
> org.apache.ratis.grpc.TestReadOnlyRequestWithGrpc.testReadAfterWrite -- Time
> elapsed: 1.572 s <<< FAILURE!
> org.opentest4j.AssertionFailedError: expected: <true> but was: <false>
> at
> org.apache.ratis.ReadOnlyRequestTests.testReadAfterWriteImpl(ReadOnlyRequestTests.java:314)
> at
> org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:143)
> at
> org.apache.ratis.server.impl.MiniRaftCluster$Factory$Get.runWithNewCluster(MiniRaftCluster.java:121)
> at
> org.apache.ratis.ReadOnlyRequestTests.testReadAfterWrite(ReadOnlyRequestTests.java:289)
> {code}
> It failed 8 in [this 10x10
> run|https://github.com/apache/ratis/actions/runs/19023405871/job/54322726144].
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