saintstack commented on a change in pull request #753: HBASE-23181 Blocked WAL
archive: "LogRoller: Failed to schedule flush…
URL: https://github.com/apache/hbase/pull/753#discussion_r338874468
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File path:
hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/wal/SequenceIdAccounting.java
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@@ -184,6 +185,30 @@ void update(byte[] encodedRegionName, Set<byte[]>
families, long sequenceid,
}
}
+ /**
+ * Clear all the records of the given region as it is going to be closed.
+ * <p/>
+ * We will call this once we get the region close marker. We need this
because that, if we use
+ * Durability.ASYNC_WAL, after calling startCacheFlush, we may still get
some ongoing wal entries
+ * that has not been processed yet, this will lead to orphan records in the
+ * lowestUnflushedSequenceIds and then cause too many WAL files.
+ * <p/>
+ * See HBASE-23157 for more details.
+ */
Review comment:
Good comment.
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