CodingCat opened a new pull request, #2462:
URL: https://github.com/apache/celeborn/pull/2462
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### What changes were proposed in this pull request?
this PR proposes to use finer grained lock in changePartitionManager when
handling requests for different partitions
### Why are the changes needed?
we observed that the intensive competition of locks when there are many
partition got split. most of change-partition-executor threads are competing
for the concurrenthashmap used in ChangePartitionManager...this
concurrentHashMap is holding request per partition but we are lock at the whole
map instead of per partition level,
with this change, the driver memory footprint is significantly reduced due
to the increased processing throughput...
### Does this PR introduce _any_ user-facing change?
one more configs
### How was this patch tested?
prod
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