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https://issues.apache.org/jira/browse/SPARK-3498?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=14131256#comment-14131256
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Reynold Xin commented on SPARK-3498:
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cc [~tdas]
> Block always replicated to the same node
> ----------------------------------------
>
> Key: SPARK-3498
> URL: https://issues.apache.org/jira/browse/SPARK-3498
> Project: Spark
> Issue Type: Improvement
> Components: Spark Core
> Affects Versions: 1.0.2
> Reporter: shenhong
>
> When running a spark streaming job, we should replicate receiver blocks, but
> all the blocks replicated to the same node. Here is the log.
> 14/09/10 19:55:16 INFO BlockManagerInfo: Added input-0-1410350117000 in
> memory on 10.196.131.19:42261 (size: 8.9 MB, free: 1050.3 MB)
> 14/09/10 19:55:16 INFO BlockManagerInfo: Added input-0-1410350117000 in
> memory on tdw-10-196-130-155:51155 (size: 8.9 MB, free: 879.3 MB)
> 14/09/10 19:55:17 INFO BlockManagerInfo: Added input-0-1410350118000 in
> memory on 10.196.131.19:42261 (size: 7.7 MB, free: 1042.6 MB)
> 14/09/10 19:55:17 INFO BlockManagerInfo: Added input-0-1410350118000 in
> memory on tdw-10-196-130-155:51155 (size: 7.7 MB, free: 871.6 MB)
> 14/09/10 19:55:18 INFO BlockManagerInfo: Added input-0-1410350119000 in
> memory on 10.196.131.19:42261 (size: 7.3 MB, free: 1035.3 MB)
> 14/09/10 19:55:18 INFO BlockManagerInfo: Added input-0-1410350119000 in
> memory on tdw-10-196-130-155:51155 (size: 7.3 MB, free: 864.3 MB)
> The reason is when blockManagerSlave ask blockManagerMaster for a
> blockManagerId, blockManagerMaster always return the same blockManagerId.
> Here is the code:
> private def getPeers(blockManagerId: BlockManagerId, size: Int):
> Seq[BlockManagerId] = {
> val peers: Array[BlockManagerId] = blockManagerInfo.keySet.toArray
> val selfIndex = peers.indexOf(blockManagerId)
> if (selfIndex == -1) {
> throw new SparkException("Self index for " + blockManagerId + " not
> found")
> }
> // Note that this logic will select the same node multiple times if there
> aren't enough peers
> Array.tabulate[BlockManagerId](size) { i => peers((selfIndex + i + 1) %
> peers.length) }.toSeq
> }
> I think the blockManagerMaster should return the size of blockManagerId with
> more remain memory .
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