Vladislav Pyatkov created IGNITE-14140:
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Summary: Checkpointer thread holds write lock too long
Key: IGNITE-14140
URL: https://issues.apache.org/jira/browse/IGNITE-14140
Project: Ignite
Issue Type: Bug
Components: persistence
Reporter: Vladislav Pyatkov
Assignee: Vladislav Pyatkov
Free lists flushing optimization can block db-checkpoint-thread when it got
Write lock. It might block all transactions for several hundreds milliseconds.
{noformat}
"db-checkpoint-thread-#334%DPL_GRID%DplGridNodeName%" #667 daemon prio=5
os_prio=0 tid=0x00007e765c123800 nid=0xee0b8 runnable [0x00007e767f535000]
java.lang.Thread.State: RUNNABLE at sun.misc.Unsafe.getObjectVolatile(Native
Method) at
java.util.concurrent.atomic.AtomicReferenceArray.getRaw(AtomicReferenceArray.java:130)
at
java.util.concurrent.atomic.AtomicReferenceArray.get(AtomicReferenceArray.java:125)
at
org.apache.ignite.internal.processors.cache.persistence.freelist.AbstractFreeList.getBucketCache(AbstractFreeList.java:690)
at
org.apache.ignite.internal.processors.cache.persistence.freelist.PagesList.flushBucketsCache(PagesList.java:374)
at
org.apache.ignite.internal.processors.cache.persistence.freelist.PagesList.saveMetadata(PagesList.java:343)
at
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager.saveStoreMetadata(GridCacheOffheapManager.java:373)
at
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager.syncMetadata(GridCacheOffheapManager.java:336)
at
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager.syncMetadata(GridCacheOffheapManager.java:322)
at
org.apache.ignite.internal.processors.cache.persistence.GridCacheOffheapManager.onMarkCheckpointBegin(GridCacheOffheapManager.java:247)
at
org.apache.ignite.internal.processors.cache.persistence.checkpoint.CheckpointWorkflow.markCheckpointBegin(CheckpointWorkflow.java:281)
at
org.apache.ignite.internal.processors.cache.persistence.checkpoint.Checkpointer.doCheckpoint(Checkpointer.java:388)
at
org.apache.ignite.internal.processors.cache.persistence.checkpoint.Checkpointer.body(Checkpointer.java:264)
at org.apache.ignite.internal.util.worker.GridWorker.run(GridWorker.java:119)
at java.lang.Thread.run(Thread.java:748)
{noformat}
We can to reduce time into Write lock if switch off optimization before the
lock will be gotten and enable it after the lock will be left off.
This image confirms that all time consume of storing the metadata cache.
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