HDFS-16557. BootstrapStandby failed because of checking gap for inprogress EditLogInputStream #4219

tomscut · 2022-04-22T09:21:28Z

The lastTxId of an inprogress EditLogInputStream lastTxId isn't necessarily HdfsServerConstants.INVALID_TXID. We can determine its status directly by EditLogInputStream#isInProgress.

We introduced [SBN READ], and set dfs.ha.tail-edits.in-progress=true. Then bootstrapStandby a new Namenode, the EditLogInputStream of inProgress is misjudged, resulting in a gap check failure, which causes bootstrapStandby to fail.

hdfs namenode -bootstrapStandby

hadoop-yetus · 2022-04-22T15:33:56Z

💔 -1 overall

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tomscut · 2022-04-24T01:18:13Z

Thanks @ashutoshcipher for your review.

tomscut · 2022-04-24T01:19:18Z

Hi @tasanuma @xkrogen @sunchao , could you please have a look? Thanks a lot.

tomscut · 2022-04-27T06:20:19Z

Hi @ayushtkn @Hexiaoqiao @ferhui , could you please also take a look? Thanks a lot.

xkrogen

This seems right to me, but I don't fully understand what went wrong to cause the error. Can you explain more fully? Why did we previously make the assumption that INVALID_TXID meant in-progress, and what has changed to make that not true / what happened in your specific scenario to cause that not to be true?

...hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java

tomscut · 2022-04-30T02:12:19Z

This seems right to me, but I don't fully understand what went wrong to cause the error. Can you explain more fully? Why did we previously make the assumption that INVALID_TXID meant in-progress, and what has changed to make that not true / what happened in your specific scenario to cause that not to be true?

Thank you @xkrogen very much for your review.

After introducing [SBN READ], we updated the configuration: dfs.ha.tail-edits.in-progress=true.

Then when we bootstrapStandby, we will encounter something like this:

We need to start an Observer Namenode, so we execute bootstrapStandby before start it. This will automatically pull the latest FSImage from the Active Namenode and check whether the edits in the journals has a gap based on the lastTxid of the FSImage.
Assume that the txid of the latest FSImage is x, and editslogs from x in journals is in InProgress state, FSEditLog#checkForGaps will be skipped. Because the lastTxid of the InProgress EditLogInputStream is not HdfsServerConstants.INVALID_TXID, but a specific number.
However, between x and txID currently being written in journal, there is finalize Edit log, and bootstrapStandby can execute normally.

The lastTxId of an InProgress EditLogInputStream isn't always as HdfsServerConstants.INVALID_TXID, could also be a specific number.

tomscut · 2022-04-30T02:29:19Z

Hi @xkrogen , to make the change safe, we can change the condition from:
if(next == HdfsServerConstants.INVALID_TXID)
to
if(next == HdfsServerConstants.INVALID_TXID || elis.isInProgress())

Do you think it's necessary?

hadoop-yetus · 2022-04-30T08:33:39Z

💔 -1 overall

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…gress EditLogInputStream

tomscut · 2022-05-21T02:23:32Z

Hi @xkrogen , please take a look if you have enough bandwidth. Thanks a lot.

hadoop-yetus · 2022-05-21T08:28:57Z

💔 -1 overall

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		365m 17s

Reason	Tests
Failed junit tests	hadoop.hdfs.tools.TestDFSAdmin
	hadoop.hdfs.server.datanode.fsdataset.impl.TestFsDatasetImpl
	hadoop.hdfs.server.sps.TestExternalStoragePolicySatisfier

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ZanderXu · 2022-05-23T02:20:48Z

Thanks @tomscut for your report. Similar with HDFS-14806 ?

tomscut · 2022-05-23T10:25:03Z

Thanks @tomscut for your report. Similar with HDFS-14806 ?

Thanks @ZanderXu for your comments. Setting DFS_HA_TAILEDITS_INPROGRESS_KEY to false could solve the problem. But if we correct the logic of judging in-progress EditLogInputStream, it seems more reasonable.

tomscut · 2022-05-28T06:22:45Z

Hi @ayushtkn , could you please also take a look at this. Thanks.

tomscut · 2022-06-07T02:20:51Z

Hi @jojochuang @tasanuma @Hexiaoqiao , could you please also take a look. Thanks.

tomscut · 2022-06-08T03:34:27Z

Hi @xkrogen , if you have enough bandwidth, please take a look. Thank you.

ZanderXu · 2022-06-09T04:53:23Z

Thanks @tomscut , after tracing the code, I think we cannot add elis.isInProgress().

And I will explain my ideas trough questions and answers.
Question one: Why was INVALID_TXID considered in the original code?

CheckForGaps method is used to check whether streams contains continuous TXids from fromTxId to toAtLeastTxid
LastTxId equals INVALID_TXID means the stream is in progress
toAtLeastTxid maybe abnormal value, like Long.MaxValue. So the CheckForGaps method only need to cover the latest inprogress segment.

Question two: What is the difference between INVALID_TXID and is InProgress()？

Before introducing [SBN READ], LastTxId equals INVALID_TXID means the stream is in progress. And stream is in progress means it's lastTxId is INVALID_TXID.
But after introducing [SBN READ], LastTxId equals INVALID_TXID means the stream is in progress. But stream is in progress cannot mean it's lastTxId is INVALID_TXID. Because introducing getJournaledEdits.
So if we add elis.isInProgress() in CheckForGaps, it cannot cover the last writing segments which actual contains latest edit.

Please correct me if anything is wrong.

tomscut · 2022-06-10T02:29:01Z

Thanks @tomscut , after tracing the code, I think we cannot add elis.isInProgress().

And I will explain my ideas trough questions and answers. Question one: Why was INVALID_TXID considered in the original code?

CheckForGaps method is used to check whether streams contains continuous TXids from fromTxId to toAtLeastTxid

LastTxId equals INVALID_TXID means the stream is in progress

toAtLeastTxid maybe abnormal value, like Long.MaxValue. So the CheckForGaps method only need to cover the latest inprogress segment.

Question two: What is the difference between INVALID_TXID and is InProgress()？

Before introducing [SBN READ], LastTxId equals INVALID_TXID means the stream is in progress. And stream is in progress means it's lastTxId is INVALID_TXID.

But after introducing [SBN READ], LastTxId equals INVALID_TXID means the stream is in progress. But stream is in progress cannot mean it's lastTxId is INVALID_TXID. Because introducing getJournaledEdits.

So if we add elis.isInProgress() in CheckForGaps, it cannot cover the last writing segments which actual contains latest edit.

Please correct me if anything is wrong.

Thanks @ZanderXu for your comment. Please refer to the stack.

When we set dfs.ha.tail-edits.in-progress=true, the edits can be read by getJournaledEdits (there is no gap actually) . But there is an GAP exception thrown.

ZanderXu · 2022-06-10T03:07:00Z

OK, back to BootstrapStandby GAP.
Form this stack information, I got that it try to get streams from 1049837441 to 1050196644. But cannot get the txid 1049842441 from the result streams.
So I think we should to trace the root cause, why can't we find txid 1049842441 in the return result of selectInputStreams(streams, 1049837441, true, true)?

Please correct me if anything is wrong.

tomscut · 2022-06-10T03:14:50Z

OK, back to BootstrapStandby GAP. Form this stack information, I got that it try to get streams from 1049842441 to 1050196644. But cannot get the txid 1049842441 from the result streams. So I think we should to trace the root cause, why can't we find txid 1049842441 in the return result of selectInputStreams(streams, 1049842441, true, true)?

Please correct me if anything is wrong.

Please refer to the discussion with @xkrogen above.

The root cause is the if condition (if(next == HdfsServerConstants.INVALID_TXID)) that does not enter properly.

ZanderXu · 2022-06-10T03:18:51Z

Oh, i know, the root cause is that getJournaledEdits returns up to 5000 txids by default. And 1049842441 - 1049837441 = 5000.

It can't reached to 1050196644, so checkForGaps failed.

ZanderXu · 2022-06-10T03:22:26Z

So in this case, we should change bootstrap logic.
Solution one: set DFS_HA_TAILEDITS_INPROGRESS_KEY to false.
Solution two: call getJournaledEdits multiple times until get the latest txid, and then go to checkgap

ZanderXu · 2022-06-10T03:28:30Z

As I explained above, change to if (next == HdfsServerConstants.INVALID_TXID || elis.isInProgress()) maybe change the original semantics of the checkgap method.

About my explain, do you have any questions？😁 Discuss together and become more familiar with the relevant logic.

ZanderXu · 2022-06-10T03:46:32Z

When we set dfs.ha.tail-edits.in-progress=true, the edits can be read by getJournaledEdits (there is no gap actually) . But there is an GAP exception thrown.

I think there is a gap here because bootstrap expects to get 1050196644 txid, but can't find it in the result. So throwing GAP Exception is ok.

github-actions · 2025-11-13T00:23:31Z

We're closing this stale PR because it has been open for 100 days with no activity. This isn't a judgement on the merit of the PR in any way. It's just a way of keeping the PR queue manageable.
If you feel like this was a mistake, or you would like to continue working on it, please feel free to re-open it and ask for a committer to remove the stale tag and review again.
Thanks all for your contribution.

tomscut changed the title ~~HDFS-16557. BootstrapStandby failed because of checking Gap for inprogress EditLogInputStream~~ HDFS-16557. BootstrapStandby failed because of checking gap for inprogress EditLogInputStream Apr 22, 2022

hotcodemacha approved these changes Apr 23, 2022

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xkrogen reviewed Apr 29, 2022

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...hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/server/namenode/FSEditLog.java Outdated Show resolved Hide resolved

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tomscut force-pushed the HDFS-16557 branch from 6e602e9 to 7a37d95 Compare May 21, 2022 02:22

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github-actions bot added the Stale label Nov 13, 2025

github-actions bot closed this Nov 14, 2025

HDFS-16557. BootstrapStandby failed because of checking gap for inprogress EditLogInputStream #4219

HDFS-16557. BootstrapStandby failed because of checking gap for inprogress EditLogInputStream #4219

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