[jira] [Created] (HDDS-4186) CLONE - Improve performance of the BufferPool management of Ozone client

["Glen Geng (Jira)" <ji...@apache.org>]

Glen Geng created HDDS-4186:
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             Summary: CLONE - Improve performance of the BufferPool management of Ozone client
                 Key: HDDS-4186
                 URL: https://issues.apache.org/jira/browse/HDDS-4186
             Project: Hadoop Distributed Data Store
          Issue Type: Improvement
            Reporter: Glen Geng
            Assignee: Marton Elek


Teragen reported to be slow with low number of mappers compared to HDFS.

In my test (one pipeline, 3 yarn nodes) 10 g teragen with HDFS was ~3 mins but with Ozone it was 6 mins. It could be fixed with using more mappers, but when I investigated the execution I found a few problems reagrding to the BufferPool management.

 1. IncrementalChunkBuffer is slow and it might not be required as BufferPool itself is incremental
 2. For each write operation the bufferPool.allocateBufferIfNeeded is called which can be a slow operation (positions should be calculated).
 3. There is no explicit support for write(byte) operations

In the flamegraph it's clearly visible that with low number of mappers the client is busy with buffer operations. After the patch the rpc call and the checksum calculation give the majority of the time. 



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