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From "Yuki Morishita (JIRA)" <j...@apache.org>
Subject [jira] [Commented] (CASSANDRA-9882) DTCS (maybe other strategies) can block flushing when there are lots of sstables
Date Wed, 12 Aug 2015 22:54:46 GMT

    [ https://issues.apache.org/jira/browse/CASSANDRA-9882?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14694362#comment-14694362
] 

Yuki Morishita commented on CASSANDRA-9882:
-------------------------------------------

Besides checking expiring SSTables, {{DateTieredCompactionStrategy#getCompactionCandidate}}
seems heavyweight also, it iterates over many SSTables to sort, filter, find max timestamp
etc.
Can we do some of those works and cache them when SSTables are added/removed?

> DTCS (maybe other strategies) can block flushing when there are lots of sstables
> --------------------------------------------------------------------------------
>
>                 Key: CASSANDRA-9882
>                 URL: https://issues.apache.org/jira/browse/CASSANDRA-9882
>             Project: Cassandra
>          Issue Type: Bug
>          Components: Core
>            Reporter: Jeremiah Jordan
>            Assignee: Marcus Eriksson
>              Labels: dtcs
>             Fix For: 2.1.x, 2.2.x
>
>
> MemtableFlushWriter tasks can get blocked by Compaction getNextBackgroundTask.  This
is in a wonky cluster with 200k sstables in the CF, but seems bad for flushing to be blocked
by getNextBackgroundTask when we are trying to make these new "smart" strategies that may
take some time to calculate what to do.
> {noformat}
> "MemtableFlushWriter:21" daemon prio=10 tid=0x00007ff7ad965000 nid=0x6693 waiting for
monitor entry [0x00007ff78a667000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.cassandra.db.compaction.WrappingCompactionStrategy.handleNotification(WrappingCompactionStrategy.java:237)
> 	- waiting to lock <0x00000006fcdbbf60> (a org.apache.cassandra.db.compaction.WrappingCompactionStrategy)
> 	at org.apache.cassandra.db.DataTracker.notifyAdded(DataTracker.java:518)
> 	at org.apache.cassandra.db.DataTracker.replaceFlushed(DataTracker.java:178)
> 	at org.apache.cassandra.db.compaction.AbstractCompactionStrategy.replaceFlushed(AbstractCompactionStrategy.java:234)
> 	at org.apache.cassandra.db.ColumnFamilyStore.replaceFlushed(ColumnFamilyStore.java:1475)
> 	at org.apache.cassandra.db.Memtable$FlushRunnable.runMayThrow(Memtable.java:336)
> 	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> 	at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
> 	at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1127)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
>    Locked ownable synchronizers:
> 	- <0x0000000743b3ac38> (a java.util.concurrent.ThreadPoolExecutor$Worker)
> "MemtableFlushWriter:19" daemon prio=10 tid=0x00007ff7ac57a000 nid=0x649b waiting for
monitor entry [0x00007ff78b8ee000]
>    java.lang.Thread.State: BLOCKED (on object monitor)
> 	at org.apache.cassandra.db.compaction.WrappingCompactionStrategy.handleNotification(WrappingCompactionStrategy.java:237)
> 	- waiting to lock <0x00000006fcdbbf60> (a org.apache.cassandra.db.compaction.WrappingCompactionStrategy)
> 	at org.apache.cassandra.db.DataTracker.notifyAdded(DataTracker.java:518)
> 	at org.apache.cassandra.db.DataTracker.replaceFlushed(DataTracker.java:178)
> 	at org.apache.cassandra.db.compaction.AbstractCompactionStrategy.replaceFlushed(AbstractCompactionStrategy.java:234)
> 	at org.apache.cassandra.db.ColumnFamilyStore.replaceFlushed(ColumnFamilyStore.java:1475)
> 	at org.apache.cassandra.db.Memtable$FlushRunnable.runMayThrow(Memtable.java:336)
> 	at org.apache.cassandra.utils.WrappedRunnable.run(WrappedRunnable.java:28)
> 	at com.google.common.util.concurrent.MoreExecutors$SameThreadExecutorService.execute(MoreExecutors.java:297)
> 	at org.apache.cassandra.db.ColumnFamilyStore$Flush.run(ColumnFamilyStore.java:1127)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
> "CompactionExecutor:14" daemon prio=10 tid=0x00007ff7ad359800 nid=0x4d59 runnable [0x00007fecce3ea000]
>    java.lang.Thread.State: RUNNABLE
> 	at org.apache.cassandra.io.sstable.SSTableReader.equals(SSTableReader.java:628)
> 	at com.google.common.collect.ImmutableSet.construct(ImmutableSet.java:206)
> 	at com.google.common.collect.ImmutableSet.construct(ImmutableSet.java:220)
> 	at com.google.common.collect.ImmutableSet.access$000(ImmutableSet.java:74)
> 	at com.google.common.collect.ImmutableSet$Builder.build(ImmutableSet.java:531)
> 	at com.google.common.collect.Sets$1.immutableCopy(Sets.java:606)
> 	at org.apache.cassandra.db.ColumnFamilyStore.getOverlappingSSTables(ColumnFamilyStore.java:1352)
> 	at org.apache.cassandra.db.compaction.DateTieredCompactionStrategy.getNextBackgroundSSTables(DateTieredCompactionStrategy.java:88)
> 	at org.apache.cassandra.db.compaction.DateTieredCompactionStrategy.getNextBackgroundTask(DateTieredCompactionStrategy.java:65)
> 	- locked <0x00000006fcdbbf00> (a org.apache.cassandra.db.compaction.DateTieredCompactionStrategy)
> 	at org.apache.cassandra.db.compaction.WrappingCompactionStrategy.getNextBackgroundTask(WrappingCompactionStrategy.java:72)
> 	- locked <0x00000006fcdbbf60> (a org.apache.cassandra.db.compaction.WrappingCompactionStrategy)
> 	at org.apache.cassandra.db.compaction.CompactionManager$BackgroundCompactionTask.run(CompactionManager.java:238)
> 	at java.util.concurrent.Executors$RunnableAdapter.call(Executors.java:471)
> 	at java.util.concurrent.FutureTask.run(FutureTask.java:262)
> 	at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1145)
> 	at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
> 	at java.lang.Thread.run(Thread.java:745)
> {noformat}



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