Package org.apache.flink.runtime.rest.handler.job.checkpoints

Class CheckpointStatsCache

java.lang.Object

org.apache.flink.runtime.rest.handler.job.checkpoints.CheckpointStatsCache

public class CheckpointStatsCache
extends Object

A size-based cache of accessed checkpoints for completed and failed checkpoints.

Having this cache in place for accessed stats improves the user experience quite a bit as accessed checkpoint stats stay available and don't expire. For example if you manage to click on the last checkpoint in the history, it is not available via the stats as soon as another checkpoint is triggered. With the cache in place, the checkpoint will still be available for investigation.

Constructor Summary

Constructors

Constructor	Description
CheckpointStatsCache(int maxNumEntries)

Method Summary

Modifier and Type	Method	Description
void	tryAdd(AbstractCheckpointStats checkpoint)	Try to add the checkpoint to the cache.
AbstractCheckpointStats	tryGet(long checkpointId)	Try to look up a checkpoint by it's ID in the cache.

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Constructor Details

CheckpointStatsCache

public CheckpointStatsCache(int maxNumEntries)

Method Details

tryAdd

public void tryAdd(AbstractCheckpointStats checkpoint)

Try to add the checkpoint to the cache.

Parameters:

checkpoint - Checkpoint to be added.

tryGet

public AbstractCheckpointStats tryGet(long checkpointId)

Try to look up a checkpoint by it's ID in the cache.

Parameters:

checkpointId - ID of the checkpoint to look up.

Returns:

The checkpoint or null if checkpoint not found.