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Posted to hdfs-dev@hadoop.apache.org by "Kihwal Lee (JIRA)" <ji...@apache.org> on 2015/08/06 20:01:05 UTC
[jira] [Created] (HDFS-8865) Improve quota initialization
performance
Kihwal Lee created HDFS-8865:
--------------------------------
Summary: Improve quota initialization performance
Key: HDFS-8865
URL: https://issues.apache.org/jira/browse/HDFS-8865
Project: Hadoop HDFS
Issue Type: Improvement
Reporter: Kihwal Lee
After replaying edits, the whole file system tree is recursively scanned in order to initialize the quota. For big name space, this can take a very long time. Since this is done during namenode failover, it also affects failover latency.
By using the Fork-Join framework, I was able to greatly reduce the initialization time. The following is the test result using the fsimage from one of the big name nodes we have.
|| threads || seconds||
| 1 (existing) | 55|
| 1 (fork-join) | 68 |
| 4 | 16 |
| 8 | 8 |
| 12 | 6 |
| 16 | 5 |
| 20 | 4 |
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