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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2021/03/06 17:21:30 UTC
[GitHub] [hadoop] lamber-ken opened a new pull request #2750: HADOOP-15880. Reduce redundant end logsegment rpc
lamber-ken opened a new pull request #2750:
URL: https://github.com/apache/hadoop/pull/2750
## ISSUE
https://issues.apache.org/jira/browse/HDFS-15880
## OUTLINE
The SNN always send end logsegment rpc in cycle（dfs.ha.log-roll.period=120s）.
-
- If no edit request occurs during this period, ANN will still send the RPC request to the journal node which is redundant.
- The `FSEditLog#endCurrentLogSegment` is synchronized will affetc other rpc requests.
Editlogs only contains two operations :
```
LogSegmentOp [opCode=OP_START_LOG_SEGMENT, txid=-12345]
LogSegmentOp [opCode=OP_END_LOG_SEGMENT, txid=-12345]
```
```
[dcadmin@dw-work-006 ~]$ ll /work/data/hadoop/hdfs/journalnode/nn-work/current/
total 1100
-rw-r----- 1 dcadmin dcadmin 8 Mar 7 01:02 committed-txid
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:35 edits_0000000000000000001-0000000000000000002
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:37 edits_0000000000000000003-0000000000000000004
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:39 edits_0000000000000000005-0000000000000000006
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:41 edits_0000000000000000007-0000000000000000008
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:43 edits_0000000000000000009-0000000000000000010
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:45 edits_0000000000000000011-0000000000000000012
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:48 edits_0000000000000000013-0000000000000000014
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:50 edits_0000000000000000015-0000000000000000016
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:52 edits_0000000000000000017-0000000000000000018
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:54 edits_0000000000000000019-0000000000000000020
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:56 edits_0000000000000000021-0000000000000000022
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 00:58 edits_0000000000000000023-0000000000000000024
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 01:00 edits_0000000000000000025-0000000000000000026
-rw-r----- 1 dcadmin dcadmin 42 Mar 7 01:02 edits_0000000000000000027-0000000000000000028
```
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[GitHub] [hadoop] lamber-ken closed pull request #2750: HADOOP-15880. Reduce redundant end logsegment rpc
Posted by GitBox <gi...@apache.org>.
lamber-ken closed pull request #2750:
URL: https://github.com/apache/hadoop/pull/2750
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