karanmehta93 commented on a change in pull request #419: PHOENIX-4009 Run
UPDATE STATISTICS command by using MR integration on…
URL: https://github.com/apache/phoenix/pull/419#discussion_r246261216
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File path:
phoenix-core/src/main/java/org/apache/phoenix/mapreduce/PhoenixRecordReader.java
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@@ -108,6 +109,7 @@ public void initialize(InputSplit split,
TaskAttemptContext context) throws IOEx
final PhoenixInputSplit pSplit = (PhoenixInputSplit)split;
final List<Scan> scans = pSplit.getScans();
try {
+ LOG.info("Generating iterators for " + scans.size() + " scans in
keyrange: " + pSplit.getKeyRange());
Review comment:
Record reader is initialized once per mapper job and the map jobs are
limited by number of regions. Also these logs will be distributed on several
machines and not one. It would be good to have some insight here on the
iterators each reader is trying to generate.
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