ohadshacham commented on a change in pull request #59: [OMID-146] Fix
consistensy of compaction when the commit time stamp has…
URL: https://github.com/apache/incubator-omid/pull/59#discussion_r277982612
##########
File path:
hbase-coprocessor/src/main/java/org/apache/omid/transaction/CompactorScanner.java
##########
@@ -228,43 +228,90 @@ private long getLowWatermarkFromCommitTable() throws
IOException {
}
}
- private Optional<CommitTimestamp> queryCommitTimestamp(Cell cell) throws
IOException {
- Optional<CommitTimestamp> cachedValue =
commitCache.get(cell.getTimestamp());
- if (cachedValue != null) {
- return cachedValue;
- }
+
+ private Result getShadowCell(byte[] row, byte[] family, byte[] qualifier,
long timestamp) throws IOException {
+ Get g = new Get(row);
+ g.addColumn(family, qualifier);
+ g.setTimeStamp(timestamp);
+ Result r = hRegion.get(g);
+ return r;
+ }
+
+
+ private Optional<CommitTimestamp> getCommitTimestampWithRaces(Cell cell)
throws IOException {
try {
+ byte[] family = CellUtil.cloneFamily(cell);
+ byte[] qualifier =
CellUtils.addShadowCellSuffixPrefix(cell.getQualifierArray(),
+ cell.getQualifierOffset(),
+ cell.getQualifierLength());
+ // 2) Then check the commit table
Optional<CommitTimestamp> ct =
commitTableClient.getCommitTimestamp(cell.getTimestamp()).get();
if (ct.isPresent()) {
- commitCache.put(cell.getTimestamp(), ct);
- return Optional.of(ct.get());
- } else {
- Get g = new Get(CellUtil.cloneRow(cell));
- byte[] family = CellUtil.cloneFamily(cell);
- byte[] qualifier =
CellUtils.addShadowCellSuffixPrefix(cell.getQualifierArray(),
- cell.getQualifierOffset(),
- cell.getQualifierLength());
- g.addColumn(family, qualifier);
- g.setTimeStamp(cell.getTimestamp());
- Result r = hRegion.get(g);
- if (r.containsColumn(family, qualifier)) {
+ if (ct.get().isValid()) {
+ return Optional.of(ct.get());
+ }
+ // If invalid still should check sc because maybe we are in
lowlatency mode.
+ }
+
+ // 3) Read from shadow cell
+ Result r = getShadowCell(CellUtil.cloneRow(cell), family,
qualifier, cell.getTimestamp());
+ if (r.containsColumn(CellUtil.cloneFamily(cell), qualifier)) {
+ Optional<CommitTimestamp> retval = Optional.of(new
CommitTimestamp(SHADOW_CELL,
+ Bytes.toLong(r.getValue(family, qualifier)), true));
+ return retval;
+ }
+
+ // [OMID-146] - we have to invalidate a transaction if it hasn't
reached the commit table
+ // 4) invalidate the entry
+ Boolean invalidated =
commitTableClient.tryInvalidateTransaction(cell.getTimestamp()).get();
+ if (invalidated) {
+ // If we are running lowLatency Omid, we could have manged to
invalidate a ct entry,
Review comment:
```suggestion
// If we are running lowLatency Omid, we could have managed
to invalidate a ct entry,
```
----------------------------------------------------------------
This is an automated message from the Apache Git Service.
To respond to the message, please log on to GitHub and use the
URL above to go to the specific comment.
For queries about this service, please contact Infrastructure at:
us...@infra.apache.org
With regards,
Apache Git Services
