Another observation which I really want to know why. I see 1 tablet server consistently shows high number of waiting scans, i.e. '16 (435)' or '14 (476)' on Running Scans column, while the other 19 tablet servers all showing '0 (0)' or sometimes showing single digit number. The thing I don't understand is what I've seen from the Monitor UI for a table at one snapshot for example, and this is more or less consistent from time to time (when the test clients are still running).
Server | Query | Running Scans ==================== TServer1 | 24 | 0 (0) TServer2 | 37 | 0 (0) TServer3 | 40 | 0 (0) TServer4 | 1 | 0 (0) TServer5 | 0 | 0 (0) TServer6 | 57 | 0 (0) TServer7 | 5 | 0 (0) TServer8 | 4 | 0 (0) TServer9 | 7 | 0 (0) TServer10 | 0 | 0 (0) TServer11 | 56 | 0 (0) TServer12 | 124 | 0 (0) TServer13 | 25 | 0 (0) TServer14 | 121 | 16 (435) TServer15 | 36 | 0 (0) TServer16 | 21 | 0 (0) TServer17 | 3 | 0 (0) TServer18 | 107 | 0 (0) TServer19 | 21 | 0 (0) TServer20 | 92 | 0 (0) I'd really appreciate if someone could explain what may have happened, or can point me to the right direction for starting the investigation. For the record, there are 50 test clients, each may create multiple scanners to query different data from that table. Thanks, Z -- View this message in context: http://apache-accumulo.1065345.n5.nabble.com/question-on-data-block-cache-tp15906p15934.html Sent from the Developers mailing list archive at Nabble.com.
