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Posted to reviews@iotdb.apache.org by GitBox <gi...@apache.org> on 2020/06/26 18:32:24 UTC
[GitHub] [incubator-iotdb] samperson1997 opened a new pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
samperson1997 opened a new pull request #1423:
URL: https://github.com/apache/incubator-iotdb/pull/1423
Clear `mlog.txt` when creating snapshot, and thus avoid reading and skipping the lines which are already in `mtree.snapshot`.
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[GitHub] [incubator-iotdb] qiaojialin merged pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
Posted by GitBox <gi...@apache.org>.
qiaojialin merged pull request #1423:
URL: https://github.com/apache/incubator-iotdb/pull/1423
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
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[GitHub] [incubator-iotdb] SilverNarcissus commented on a change in pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
Posted by GitBox <gi...@apache.org>.
SilverNarcissus commented on a change in pull request #1423:
URL: https://github.com/apache/incubator-iotdb/pull/1423#discussion_r446726108
##########
File path: server/src/main/java/org/apache/iotdb/db/metadata/MLogWriter.java
##########
@@ -160,6 +162,14 @@ public static void upgradeMLog(String schemaDir, String logFileName) throws IOEx
FSFactoryProducer.getFSFactory().moveFile(tmpLogFile, logFile);
}
+ public void clear() throws IOException {
+ writer.close();
+ Files.delete(logFile.toPath());
+ FileWriter fileWriter = new FileWriter(logFile, true);
Review comment:
Maybe you should use file.getChannel().truncate(0) to clear mlog
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[GitHub] [incubator-iotdb] samperson1997 commented on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
Posted by GitBox <gi...@apache.org>.
samperson1997 commented on pull request #1423:
URL: https://github.com/apache/incubator-iotdb/pull/1423#issuecomment-650333618
**Experiment result**: (just in my computer)
When recovering from 3000K timeseries, deserializing MTree from `mlog.txt` (including reading and skipping the useless lines) takes up to 7845ms:
```
02:22:05.232 [main] DEBUG org.apache.iotdb.db.metadata.MManager - spend 7845 ms to deserialize mtree from mlog.txt
```
After deleting this useless part, the time could reduce by up to **19.5%**. Maybe when the number of timeseries is larger (for example, 10M), the "useless lines" are more, so we could save more time.
Could you please help and do an experiment with 10M timeseries and compare the result with the origin method @jixuan1989 ? I hope the result will be better this time.
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
Posted by GitBox <gi...@apache.org>.
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URL: https://github.com/apache/incubator-iotdb/pull/1423#issuecomment-650745888
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[GitHub] [incubator-iotdb] sonarcloud[bot] commented on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
Posted by GitBox <gi...@apache.org>.
sonarcloud[bot] commented on pull request #1423:
URL: https://github.com/apache/incubator-iotdb/pull/1423#issuecomment-650691327
Kudos, SonarCloud Quality Gate passed!
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[GitHub] [incubator-iotdb] sonarcloud[bot] removed a comment on pull request #1423: [IOTDB-782] [Experimental] Clear mlog when creating snapshot
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