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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/06/24 07:39:01 UTC
[GitHub] [hadoop] ZanderXu opened a new pull request, #4497: HDFS-16642. Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
ZanderXu opened a new pull request, #4497:
URL: https://github.com/apache/hadoop/pull/4497
### Description of PR
In our prod environment, 8020 Handler of Observer NameNode also blocked by EditlogTailer.
And EditlogTailer cost a long time for selecting InputStreams from Journalnode with holding the FSNLock.
During this period, 8020 handlers of Observer NameNode will be blocked by the FSN Lock.
In theory, selecting inputstreams from JournalNode does not involve changing memory information in NameNode, so we can move the selecting out of the FSN Lock, and it can improve the throughput of Observer NameNode.
After reading the relevant code in depth, I found that it is feasible to move the selecting inputStream out of the FSNLock.
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[GitHub] [hadoop] ferhui commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ferhui commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1204703471
@ZanderXu Thanks for your contribution. @jojochuang Thanks for your review! Merged
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[GitHub] [hadoop] ferhui merged pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ferhui merged PR #4497:
URL: https://github.com/apache/hadoop/pull/4497
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1204213592
:broken_heart: **-1 overall**
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[GitHub] [hadoop] ZanderXu commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1205140539
@jojochuang @ferhui Sir, thank you very much for helping review.
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[GitHub] [hadoop] ZanderXu commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1203519843
@ferhui Sir, thank you very much for your helping me to review this patch.
> The failed case TestDiskBalancerCommand seems unrelated to changes.
`TestDiskBalancerCommand` is unrelated to the change and it works well locally.
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[GitHub] [hadoop] ZanderXu commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1203581324
Copy, sir. I will rebase it on the latest the trunk.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4497: HDFS-16642. Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1165735132
:broken_heart: **-1 overall**
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| +0 :ok: | reexec | 1m 4s | | Docker mode activated. |
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| +1 :green_heart: | @author | 0m 0s | | The patch does not contain any @author tags. |
| -1 :x: | test4tests | 0m 0s | | The patch doesn't appear to include any new or modified tests. Please justify why no new tests are needed for this patch. Also please list what manual steps were performed to verify this patch. |
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| +1 :green_heart: | mvninstall | 40m 57s | | trunk passed |
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[GitHub] [hadoop] ZanderXu commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1193235376
> Looks thread-safe to me. Has this patch been tested in a production environment?
@jojochuang Thanks for your review and sorry sorry for replaying so late. We have release it in our prod environment and it works well.
After checking some jstacks of ObserverNamenodes, I found that there are no handlers blocked at `Selecting EditInputStreams`, so the performance should be improved.
@ferhui can you help me review this patch?
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[GitHub] [hadoop] ZanderXu commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1204692866
emm... `hadoop.hdfs.TestWriteConfigurationToDFS` works well locally, I don't know why it fails in CI.
cc @ferhui
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[GitHub] [hadoop] ferhui commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ferhui commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1204701969
@ZanderXu It is unrelated to this PR. can create a ticket to track it.
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[GitHub] [hadoop] ferhui commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
ferhui commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1203579943
The PR has hung there for 10 days. @ZanderXu could you please push an empty commit to trigger CI? We can avoid potential conflicts and merge it after CI runs.
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[GitHub] [hadoop] jojochuang commented on pull request #4497: HDFS-16642. [SBN read] Moving the selecting inputstream from journalnode in EditLogTailer out of FSNLock
Posted by GitBox <gi...@apache.org>.
jojochuang commented on PR #4497:
URL: https://github.com/apache/hadoop/pull/4497#issuecomment-1170586655
Looks thread-safe to me. Has this patch been tested in a production environment?
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