Fix NPE when create OpEntry #12396
Fix NPE when create OpEntry #12396
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| OpReadEntry op = OpReadEntry.create(this, readPosition, numOfEntriesToRead, callback, ctx, maxPosition); | ||
| ledger.asyncReadEntries(op); | ||
| if (op != null) { |
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Could you please provide more information about why op could be null?
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@codelipenghui This PR is used to solve NPE, is a copy of #11813 .
If op is null, the read faild event would be trigger.
There is another solution, see #11292 .
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It will be very dangerous if the dispatcher call read entries but can't receive any response, I think the broker will stop dispatching messages.
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@codelipenghui Do you think my solution is suitable? By the way, I add test. |
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/pulsarbot run-failure-checks |
| @@ -58,6 +57,11 @@ public static OpReadEntry create(ManagedCursorImpl cursor, PositionImpl readPosi | |||
| } | |||
| op.maxPosition = maxPosition; | |||
| op.ctx = ctx; | |||
| PositionImpl position = cursor.ledger.startReadOperationOnLedger(readPositionRef, op); | |||
| if (position == null) { | |||
| return null; | |||
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We can recycle this OpReadEntry if we return null.
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My point is :
readEntriesCompleteorreadEntriesFailedmust be called in any case, so read event would always receive response.OpReadEntryshould be recyle inreadEntriesCompleteorreadEntriesFailed.
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It might be better to skip recycling of failed entries. That was something that was recently removed for OpAddEntry instances in #12993.
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yes, I guess readEntriesFailed would have to be called before returning null so that the comment by @codelipenghui in https://github.com/apache/pulsar/pull/12396/files#r754321070 could be addressed.
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Please revert the change of |
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The pr had no activity for 30 days, mark with Stale label. |
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@casuallc Please rebase the changes |
| @@ -2154,6 +2154,7 @@ PositionImpl startReadOperationOnLedger(PositionImpl position, OpReadEntry opRea | |||
| if (null == ledgerId) { | |||
| opReadEntry.readEntriesFailed(new ManagedLedgerException.NoMoreEntriesToReadException("The ceilingKey(K key) method is used to return the " + | |||
| "least key greater than or equal to the given key, or null if there is no such key"), null); | |||
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still npe, can't pass on null ctx, in the process of callback, need use it.
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here also need handle, this change maybe not cover all situation. coud you see #15098, maybe it's better to fix problem. |
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Closed as stale and conflicts. |
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Fixed by #15837 |
Fixes #11796
No need doc.