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https://issues.apache.org/jira/browse/HDFS-14703?page=com.atlassian.jira.plugin.system.issuetabpanels:comment-tabpanel&focusedCommentId=17345870#comment-17345870
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Xing Lin commented on HDFS-14703:
---------------------------------
I did some performance benchmarks using a physical server (a d430 server in
[utah Emulab testbed|[www.emulab.net].) |http://www.emulab.net].%29/]I used
either RAMDISK or SSD, as the storage for HDFS. By using RAMDISK, we can remove
the time used by the SSD to make each write persistent. For the RAM case, we
observed an improvement of 45% from fine-grained locking. For the SSD case,
fine-grained locking gives us 20% improvement. We used an Intel SSD (model:
SSDSC2BX200G4R).
We noticed for trunk, the mkdir OPS is lower for the RAMDISK than SSD. We don't
know the reason for this yet. We repeated the experiment for RAMDISK for trunk
twice to confirm the performance number.
h1. tmpfs, hadoop-tmp-dir = /run/hadoop-utos
h1. 45% improvements fgl vs. trunk
h2. trunk
2021-05-16 20:37:20,280 INFO namenode.NNThroughputBenchmark: # operations:
10000000
2021-05-16 20:37:20,280 INFO namenode.NNThroughputBenchmark: Elapsed Time:
663510
2021-05-16 20:37:20,280 INFO namenode.NNThroughputBenchmark: Ops per sec:
15071.362
2021-05-16 20:37:20,280 INFO namenode.NNThroughputBenchmark: Average Time: 13
2021-05-16 22:15:13,515 INFO namenode.NNThroughputBenchmark: --- mkdirs stats
---
2021-05-16 22:15:13,515 INFO namenode.NNThroughputBenchmark: # operations:
10000000
2021-05-16 22:15:13,515 INFO namenode.NNThroughputBenchmark: Elapsed Time:
710248
2021-05-16 22:15:13,515 INFO namenode.NNThroughputBenchmark: Ops per sec:
14079.5
2021-05-16 22:15:13,515 INFO namenode.NNThroughputBenchmark: Average Time: 14
2021-05-16 22:15:13,515 INFO namenode.FSEditLog: Ending log segment 8345565,
10019540
fgl
2021-05-16 21:06:46,476 INFO namenode.NNThroughputBenchmark: --- mkdirs stats
---
2021-05-16 21:06:46,476 INFO namenode.NNThroughputBenchmark: # operations:
10000000
2021-05-16 21:06:46,476 INFO namenode.NNThroughputBenchmark: Elapsed Time:
445980
2021-05-16 21:06:46,476 INFO namenode.NNThroughputBenchmark: Ops per sec:
22422.530
2021-05-16 21:06:46,476 INFO namenode.NNThroughputBenchmark: Average Time: 8
h1. SSD, hadoop.tmp.dir=/dev/sda4
h1. 23% improvement fgl vs. trunk
trunk:
2021-05-16 21:59:06,042 INFO namenode.NNThroughputBenchmark: --- mkdirs stats
---
2021-05-16 21:59:06,042 INFO namenode.NNThroughputBenchmark: # operations:
10000000
2021-05-16 21:59:06,042 INFO namenode.NNThroughputBenchmark: Elapsed Time:
593839
2021-05-16 21:59:06,042 INFO namenode.NNThroughputBenchmark: Ops per sec:
16839.581
2021-05-16 21:59:06,042 INFO namenode.NNThroughputBenchmark: Average Time: 11
fgl
2021-05-16 21:21:03,906 INFO namenode.NNThroughputBenchmark: --- mkdirs stats
---
2021-05-16 21:21:03,906 INFO namenode.NNThroughputBenchmark: # operations:
10000000
2021-05-16 21:21:03,906 INFO namenode.NNThroughputBenchmark: Elapsed Time:
481269
2021-05-16 21:21:03,906 INFO namenode.NNThroughputBenchmark: Ops per sec:
20778.400
2021-05-16 21:21:03,906 INFO namenode.NNThroughputBenchmark: Average Time: 9
/dev/sda:
ATA device, with non-removable media
Model Number: INTEL SSDSC2BX200G4R
Serial Number: BTHC523202RD200TGN
Firmware Revision: G201DL2D
> NameNode Fine-Grained Locking via Metadata Partitioning
> -------------------------------------------------------
>
> Key: HDFS-14703
> URL: https://issues.apache.org/jira/browse/HDFS-14703
> Project: Hadoop HDFS
> Issue Type: Improvement
> Components: hdfs, namenode
> Reporter: Konstantin Shvachko
> Priority: Major
> Attachments: 001-partitioned-inodeMap-POC.tar.gz,
> 002-partitioned-inodeMap-POC.tar.gz, 003-partitioned-inodeMap-POC.tar.gz,
> NameNode Fine-Grained Locking.pdf, NameNode Fine-Grained Locking.pdf
>
>
> We target to enable fine-grained locking by splitting the in-memory namespace
> into multiple partitions each having a separate lock. Intended to improve
> performance of NameNode write operations.
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