Robin Infant A created HBASE-28599:
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Summary: RowTooBigException is thrown when duplicate increment RPC
call is attempted
Key: HBASE-28599
URL: https://issues.apache.org/jira/browse/HBASE-28599
Project: HBase
Issue Type: Bug
Components: regionserver
Affects Versions: 2.5.8, 2.5.7, 2.5.6, 2.5.5
Reporter: Robin Infant A
Attachments: RowTooBig_trace.txt
*Issue:*
`RowTooBigException` is thrown when a duplicate increment RPC call is attempted.
*Expected Behavior:*
1. The initial RPC increment call should time out for some reason.
2. The duplicate RPC call should be converted to a GET request and fetch the
result that I am trying to increment.
3. The result should contain only the qualifier that I am attempting to
increment.
*Actual Behavior:*
1. The initial RPC increment call timed out, which is expected.
2. The duplicate RPC call is converted to a GET request but fails to clone the
qualifier into the GET request.
3. Hence, the GET request attempts to retrieve all qualifiers for the given row
and columnfamily, resulting in a `RowTooBigException`.
*Steps to Reproduce:*
1. Ensure a row with a total value size exceeding `hbase.table.max.rowsize`
(default = 1073741824) exists.
2. Nonce property should be enabled `hbase.client.nonces.enabled` which is
actually defaulted to true.
3. Attempt to increment a qualifier against the same row.
4. In my case, I am using a postIncrement co-processor which may cause a delay
(longer than the RPC timeout property).
5. A duplicate increment call should be triggered, which tries to get the value
rather than increment it.
6. The GET request actually tries to retrieve all the qualifiers for the row,
resulting in a `RowTooBigException`.
*Insights:*
Upon further debugging, I found that qualifiers are not cloned into the GET
instance due to incorrect usage of
[CellScanner.advance|https://github.com/apache/hbase/blob/7ebd4381261fefd78fc2acf258a95184f4147cee/hbase-server/src/main/java/org/apache/hadoop/hbase/regionserver/HRegion.java#L3833]
*Fix Suggestion:*
Removing the `!` operation from `while (!CellScanner.advance)` may resolve the
issue.
Attached Exception Stack Trace for reference.
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