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https://issues.apache.org/jira/browse/HDDS-9960?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
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Sumit Agrawal updated HDDS-9960:
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Summary: OM State machine lastIndexUpdate consume memory and incorrect
(was: OM State machine lastIndexUpdate incorrect and complex)
> OM State machine lastIndexUpdate consume memory and incorrect
> -------------------------------------------------------------
>
> Key: HDDS-9960
> URL: https://issues.apache.org/jira/browse/HDDS-9960
> Project: Apache Ozone
> Issue Type: Bug
> Reporter: Sumit Agrawal
> Assignee: Sumit Agrawal
> Priority: Major
> Labels: pull-request-available
>
> update lastTransactionIndex is also done from another flow,
> ratis --> notifyTermIndexUpdated(). --> computeAndUpdateLastAppliedIndex()
> --> else part (for flow from ratis)
> {code:java}
> } else {
> if (getLastAppliedTermIndex().getIndex() + 1 == lastFlushedIndex) {
> updateLastAppliedTermIndex(currentTerm, lastFlushedIndex);
> if (LOG.isDebugEnabled()) {
> LOG.debug("ComputeAndUpdateLastAppliedIndex due to notifyIndex {}",
> getLastAppliedTermIndex());
> }
> } else {
> ratisTransactionMap.put(lastFlushedIndex, currentTerm); {code}
> If lastTransactionAppliedIndex and ratis transaction index difference is only
> "1", it update the last transaction index. This can cause db flush
> transaction to be behind the ratis transaction. So replay of those
> tranasaction will not happen in case of OM crash at this point.
>
> So there is a two different behavior exist, that when to update
> lastAppliedTransaction, creating confusion about expectation for this
> perspective.
>
> Also its observed updating last applied transaction stuck when there is
> difference in transaction index due to exception. This was causing
> ratisTransactionMap holding large number of transaction and not applied.
> https://issues.apache.org/jira/browse/HDDS-9342.
>
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