hi i get this error sometimes "task rejected from JobManager..."

java.lang.RuntimeException: org.apache.phoenix.exception.PhoenixIOException: Task org.apache.phoenix.job.JobManager$InstrumentedJobFutureTask@1b0a7baf rejected from org.apache.phoenix.job.JobManager$1@62417a16[Running, pool size = 128, active threads = 128, queued tasks = 5000, completed tasks = 2]

can some explain how do i figure out who to work around this ?

what is this queue and where is this located ?