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Posted to common-issues@hadoop.apache.org by GitBox <gi...@apache.org> on 2022/09/13 11:08:42 UTC
[GitHub] [hadoop] ZanderXu opened a new pull request, #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
ZanderXu opened a new pull request, #4882:
URL: https://github.com/apache/hadoop/pull/4882
JournalNode should tersely print some logs about NewerTxnIdException.
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#issuecomment-1247931689
:confetti_ball: **+1 overall**
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[GitHub] [hadoop] xkrogen commented on a diff in pull request #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
xkrogen commented on code in PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#discussion_r971240283
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/client/QuorumJournalManager.java:
##########
@@ -524,9 +524,6 @@ public void selectInputStreams(Collection<EditLogInputStream> streams,
selectRpcInputStreams(rpcStreams, fromTxnId, onlyDurableTxns);
streams.addAll(rpcStreams);
return;
- } catch (NewerTxnIdException ntie) {
- // normal situation, we requested newer IDs than any journal has. no new streams
- return;
Review Comment:
So it seems that this logic was never working? I guess that means the tests added in #4560 aren't working properly, we probably need to also confirm that in the "normal" case (where `sinceTxId == highestTxId + 1`), `selectStreamingInputStreams` is never called.
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/JournalNodeRpcServer.java:
##########
@@ -114,6 +114,7 @@ public class JournalNodeRpcServer implements QJournalProtocol,
.setVerbose(false)
.build();
+ this.server.addTerseExceptions(NewerTxnIdException.class);
Review Comment:
good catch, we should probably add `CacheMissException` as well, WDYT?
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/server/Journal.java:
##########
@@ -751,7 +751,11 @@ public GetJournaledEditsResponseProto getJournaledEdits(long sinceTxId,
"it via " + DFSConfigKeys.DFS_HA_TAILEDITS_INPROGRESS_KEY);
}
long highestTxId = getHighestWrittenTxId();
- if (sinceTxId > highestTxId) {
+ if (sinceTxId == highestTxId + 1) {
+ // Requested edits that don't exist yet; short-circuit the cache here
+ metrics.rpcEmptyResponses.incr();
+ return GetJournaledEditsResponseProto.newBuilder().setTxnCount(0).build();
+ } else if (sinceTxId > highestTxId + 1) {
// Requested edits that don't exist yet and is newer than highestTxId.
Review Comment:
Can you add some more detail in the two comments here to make it more clear why we treat the `+ 1` case differently?
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#issuecomment-1248486612
:confetti_ball: **+1 overall**
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[GitHub] [hadoop] hadoop-yetus commented on pull request #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
hadoop-yetus commented on PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#issuecomment-1245842539
:broken_heart: **-1 overall**
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[GitHub] [hadoop] xkrogen commented on pull request #4882: HDFS-16771. Follow-up for HDFS-16659: JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
xkrogen commented on PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#issuecomment-1248536133
Merged to trunk. Thanks @ZanderXu !
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[GitHub] [hadoop] ZanderXu commented on a diff in pull request #4882: HDFS-16771. JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
ZanderXu commented on code in PR #4882:
URL: https://github.com/apache/hadoop/pull/4882#discussion_r971454489
##########
hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/qjournal/client/QuorumJournalManager.java:
##########
@@ -524,9 +524,6 @@ public void selectInputStreams(Collection<EditLogInputStream> streams,
selectRpcInputStreams(rpcStreams, fromTxnId, onlyDurableTxns);
streams.addAll(rpcStreams);
return;
- } catch (NewerTxnIdException ntie) {
- // normal situation, we requested newer IDs than any journal has. no new streams
- return;
Review Comment:
copy, sir. I will add one UT to test it.
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[GitHub] [hadoop] xkrogen merged pull request #4882: HDFS-16771. Follow-up for HDFS-16659: JN should tersely print logs about NewerTxnIdException
Posted by GitBox <gi...@apache.org>.
xkrogen merged PR #4882:
URL: https://github.com/apache/hadoop/pull/4882
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