Dikang Gu created CASSANDRA-11571:
-------------------------------------
Summary: Optimize the overlapping lookup, by calculating all the
bounds in advance.
Key: CASSANDRA-11571
URL: https://issues.apache.org/jira/browse/CASSANDRA-11571
Project: Cassandra
Issue Type: Improvement
Components: Compaction
Reporter: Dikang Gu
Assignee: Dikang Gu
When L0 sstable backs up (because of repair or other reasons), I find that a
lot of CPU is using to construct the Bounds.
"CompactionExecutor:223" #1557 daemon prio=1 os_prio=4 tid=0x00007f88f401d800
nid=0x2303ab runnable [0x00007f824d735000]
java.lang.Thread.State: RUNNABLE
at
org.apache.cassandra.dht.AbstractBounds.strictlyWrapsAround(AbstractBounds.java:86)
at org.apache.cassandra.dht.Bounds.<init>(Bounds.java:44)
at
org.apache.cassandra.db.compaction.LeveledManifest.overlapping(LeveledManifest.java:533)
at
org.apache.cassandra.db.compaction.LeveledManifest.overlapping(LeveledManifest.java:520)
at
org.apache.cassandra.db.compaction.LeveledManifest.getCandidatesFor(LeveledManifest.java:595)
at
org.apache.cassandra.db.compaction.LeveledManifest.getCompactionCandidates(LeveledManifest.java:349)
- locked <0x00007f8e11e67900> (a
org.apache.cassandra.db.compaction.LeveledManifest)
at
org.apache.cassandra.db.compaction.LeveledCompactionStrategy.getNextBackgroundTask(LeveledCompactionStrategy.java:97)
- locked <0x00007f8e11b1d780> (a
org.apache.cassandra.db.compaction.LeveledCompactionStrategy)
at
org.apache.cassandra.db.compaction.WrappingCompactionStrategy.getNextBackgroundTask(WrappingCompactionStrategy.java:78)
- locked <0x00007f8e110931a0> (a
org.apache.cassandra.db.compaction.WrappingCompactionStrategy)
at
org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionCandidate.run(CompactionManager.java:250)
at
java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:511)
at java.util.concurrent.FutureTask.run(FutureTask.java:266)
at
java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1142)
at
java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:617)
at java.lang.Thread.run(Thread.java:745)
>From the code, we may construct the bounds multiply times, my patch optimize
>it by calculating it in advance.
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