rddBlocksById(rddId: Int): Map[BlockId, BlockStatus]
StorageStatus
StorageStatus
is a developer API that Spark uses to pass "just enough" information about registered BlockManagers in a Spark application between Spark services (mostly for monitoring purposes like web UI or SparkListeners).
Note
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There are two ways to access
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StorageStatus
is created when:
-
BlockManagerMasterEndpoint
is requested for storage status (of every BlockManager in a Spark application) -
StorageStatusListener
gets notified about a newBlockManager
(in a Spark application)
Name | Description |
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Lookup table of Used when…FIXME |
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Lookup table of Used when…FIXME |
updateStorageInfo
Method
Caution
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FIXME |
Creating StorageStatus Instance
StorageStatus
takes the following when created:
StorageStatus
initializes the internal registries and counters.
Getting RDD Blocks For RDD — rddBlocksById
Method
rddBlocksById
gives the blocks (as BlockId
with their status as BlockStatus
) that belong to rddId
RDD.
Note
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Removing Block (From Internal Registries) — removeBlock
Internal Method
removeBlock(blockId: BlockId): Option[BlockStatus]
removeBlock
removes blockId
from _rddBlocks registry and returns it.
Internally, removeBlock
updates block status of blockId
(to be empty, i.e. removed).
removeBlock
branches off per the type of BlockId
, i.e. RDDBlockId
or not.
For a RDDBlockId
, removeBlock
finds the RDD in _rddBlocks and removes the blockId
. removeBlock
removes the RDD (from _rddBlocks) completely, if there are no more blocks registered.
For a non-RDDBlockId
, removeBlock
removes blockId
from _nonRddBlocks registry.
Note
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removeBlock is used when StorageStatusListener removes RDD blocks for an unpersisted RDD or updates storage status for an executor.
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